2007 GMC Savana Owners Manual

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even fatal — collision if you drive after drinking. Please do not drink and drive or ride with a driver who has been drinking. Ride home in a cab; or if you are with a group, designate a driver who will not drink. 231 Control of a Vehicle You have three systems that make your vehicle go where you want it to go. They are the brakes, the steering, and the accelerator. All three systems have to do their work at the places where the tires meet the road. Sometimes, as when you are driving on snow or ice, it is easy to ask more of those control systems than the tires and road can provide. That means you can lose control of your vehicle. Adding non-GM accessories can affect your vehicle’s performance. See Accessories and Modiﬁcations on page 286. Braking See Brake System Warning Light on page 175. Braking action involves perception time and reaction time. First, you have to decide to push on the brake pedal. That is perception time. Then you have to bring up your foot and do it. That is reaction time. Average reaction time is about three-fourths of a second. But that is only an average. It might be less with one driver and as long as two or three seconds or more with another. Age, physical condition, alertness, coordination, and eyesight all play a part. So do alcohol, drugs, and frustration. But even in three-fourths of a second, a vehicle moving at 60 mph (100 km/h) travels 66 feet (20 m). That could be a lot of distance in an emergency, so keeping enough space between your vehicle and others is important. And, of course, actual stopping distances vary greatly with the surface of the road, whether it is pavement or gravel; the condition of the road, whether it is wet, dry, or icy; tire tread; the condition of the brakes; the weight of the vehicle; and the amount of brake force applied. 232 Avoid needless heavy braking. Some people drive in spurts — heavy acceleration followed by heavy braking — rather than keeping pace with traffic. This is a mistake. The brakes may not have time to cool between hard stops. The brakes will wear out much faster if you do a lot of heavy braking. If you keep pace with the traffic and allow realistic following distances, you will eliminate a lot of unnecessary braking. That means better braking and longer brake life. If your vehicle’s engine ever stops while you are driving, brake normally but do not pump the brakes. If you do, the pedal may get harder to push down. If the engine stops, you will still have some power brake assist. But you will use it when you brake. Once the power assist is used up, it may take longer to stop and the brake pedal will be harder to push. Adding non-GM accessories can affect your vehicle’s performance. See Accessories and Modiﬁcations on page 286. Anti-Lock Brake System (ABS) Your vehicle has the Anti-Lock Brake System (ABS), an advanced electronic braking system that will help prevent a braking skid. When you start your engine and begin to drive away, ABS will check itself. You may hear a momentary motor or clicking noise while this test is going on. This is normal. If there is a problem with the ABS, this warning light will stay on. See Anti-Lock Brake System Warning Light on page 176. 233 ABS can change the brake pressure faster than any driver could. The computer is programmed to make the most of available tire and road conditions. This can help you steer around the obstacle while braking hard. Let us say the road is wet and you are driving safely. Suddenly, an animal jumps out in front of you. You slam on the brakes and continue braking. Here is what happens with ABS: A computer senses that wheels are slowing down. If one of the wheels is about to stop rolling, the computer will separately work the brakes at each front wheel and at both rear wheels. 234 As you brake, your computer keeps receiving updates on wheel speed and controls braking pressure accordingly. Remember: ABS does not change the time you need to get your foot up to the brake pedal or always decrease stopping distance. If you get too close to the vehicle in front of you, you will not have time to apply your brakes if that vehicle suddenly slows or stops. Always leave enough room up ahead to stop, even though you have ABS. Using ABS Do not pump the brakes. Just hold the brake pedal down ﬁrmly and let anti-lock work for you. You may feel the brakes vibrate, or you may notice some noise, but this is normal. Braking in Emergencies With ABS, you can steer and brake at the same time. In many emergencies, steering can help you more than even the very best braking. Locking Rear Axle If your vehicle has this feature, your locking rear axle can give you additional traction on snow, mud, ice, sand or gravel. It works like a standard axle most of the time, but when one of the rear wheels has no traction and the other does, this feature will allow the wheel with traction to move the vehicle. StabiliTrak® System If your vehicle has StabiliTrak®, it combines anti-lock brake, traction and stability control systems and helps the driver maintain directional control of the vehicle in most driving conditions. When you ﬁrst start your vehicle and begin to drive away, the system performs several diagnostic checks to ensure that it is working properly. You may hear or feel the system working. This is normal and does not mean there is a problem with your vehicle. The system should initialize before the vehicle reaches 20 mph (32 km/h). In some cases, it may take approximately 2 miles (3.2 km) of driving before the system initializes. 235 The following chart describes the StabiliTrak® not ready light and the StabiliTrak® indicator light. StabiliTrak® Not Ready Light StabiliTrak® Indicator Light Meaning Off Off Off On On Off Flashing On Off Flashing StabiliTrak® is enabled, but not active. The traction control is not active. StabiliTrak® is active, or the traction control is active. StabiliTrak® is disabled due to system fault. When on after restarting, the vehicle needs to be serviced. StabiliTrak® is disabled due to system initialization or the driver has disabled with switch. StabiliTrak® is not initialized and not disabled. The traction control is active. For more information, see StabiliTrak® Not Ready Light on page 177 and StabiliTrak® Indicator Light on page 177. 236 Pressing and holding the StabiliTrak® button located on the instrument panel for more than ﬁve seconds can turn off StabiliTrak® and part of the traction control system. For your safety, the system can only be disabled when the vehicle speed is less than 20 mph (32 km/h). You will hear three chimes and the StabiliTrak® not ready light will come on. To turn on the StabiliTrak® system, press the StabiliTrak® button again. StabiliTrak® will automatically turn back on when the vehicle speed exceeds 20 mph (32 km/h). You will hear one chime and the StabiliTrak® not ready light will turn off. When the StabiliTrak® system has been turned off you may still hear system noises as a result of the brake-traction control coming on. It is recommended to leave the system on for normal driving conditions, but it may be necessary to turn the system off if your vehicle is stuck in sand, mud, ice or snow, and you want to “rock” your vehicle to attempt to free it. See If Your Vehicle is Stuck in Sand, Mud, Ice, or Snow on page 258. StabiliTrak® System Operation The StabiliTrak® system is normally on, except when the system is initializing or has been disabled with the StabiliTrak® button. The StabiliTrak® system will automatically activate to assist the driver in maintaining vehicle directional control in most driving conditions. When activated, the StabiliTrak® system may reduce engine power to the wheels and apply braking to individual wheels as necessary to assist the driver with vehicle directional control. If your vehicle is in cruise control when the system activates, the StabiliTrak® indicator light on the instrument panel will ﬂash, and the cruise control will automatically disengage. When the StabiliTrak® system is no longer active, you may re-engage the cruise control. See Cruise Control on page 151. 237 When this happens you may notice a reduction in acceleration, or may hear a noise or vibration. This is normal. Adding non-GM accessories can affect your vehicle’s performance. See Accessories and Modiﬁcations on page 286 for more information. All-Wheel Drive (AWD) System If your vehicle has all-wheel drive, your engine’s driving power is sent to all four wheels for extra traction when needed. This is like four-wheel drive, but there is no separate lever or switch to engage or disengage the front axle. It is fully automatic, and adjusts itself as needed for road conditions. You may experience a brief vehicle vibration upon acceleration when driving in slippery conditions. This is normal and is an indication that the all-wheel drive system is functioning properly. The StabiliTrak® system may also turn off automatically if it determines that a problem exists with the system. If the problem does not clear itself after restarting the vehicle, you should see your dealer for service. Traction Control Operation The traction control system is part of the StabiliTrak® system. Traction control limits wheel spin by reducing engine power to the wheels (engine speed management) and by applying brakes to each individual wheel (brake-traction control) as necessary. If the brake-traction control system activates constantly or if the brakes have heated up due to high speed braking, the brake-traction control will be automatically disabled. The system will come back on after the brakes have cooled. This can take up to two minutes or longer depending on brake usage. The traction control system may activate on dry or rough roads or under conditions such as heavy acceleration while turning or abrupt upshifts/ downshifts of the transmission. 238 Steering Power Steering If you lose power steering assist because the engine stops or the system is not functioning, you can steer but it will take much more effort. Steering Tips It is important to take curves at a reasonable speed. A lot of the “driver lost control” accidents mentioned on the news happen on curves. Here is why: Experienced driver or beginner, each of us is subject to the same laws of physics when driving on curves. The traction of the tires against the road surface makes it possible for the vehicle to change its path when you turn the front wheels. If there is no traction, inertia will keep the vehicle going in the same direction. If you have ever tried to steer a vehicle on wet ice, you will understand this. The traction you can get in a curve depends on the condition of your tires and the road surface, the angle at which the curve is banked, and your speed. While you are in a curve, speed is the one factor you can control. Suppose you are steering through a sharp curve. Then you suddenly accelerate. Both control systems — steering and acceleration — have to do their work where the tires meet the road. Adding the sudden acceleration can demand too much of those places. You can lose control. What should you do if this ever happens? Ease up on the accelerator pedal, steer the vehicle the way you want it to go, and slow down. Speed limit signs near curves warn that you should adjust your speed. Of course, the posted speeds are based on good weather and road conditions. Under less favorable conditions you will want to go slower. If you need to reduce your speed as you approach a curve, do it before you enter the curve, while your front wheels are straight ahead. Try to adjust your speed so you can “drive” through the curve. Maintain a reasonable, steady speed. Wait to accelerate until you are out of the curve, and then accelerate gently into the straightaway. Adding non-GM accessories can affect your vehicle’s performance. See Accessories and Modiﬁcations on page 286. 239 Steering in Emergencies There are times when steering can be more effective than braking. For example, you come over a hill and ﬁnd a truck stopped in your lane, or a car suddenly pulls out from nowhere, or a child darts out from between parked cars and stops right in front of you. You can avoid these problems by braking — if you can stop in time. But sometimes you cannot; there is not room. That is the time for evasive action — steering around the problem. Your vehicle can perform very well in emergencies like these. First apply your brakes. See Braking on page 232. It is better to remove as much speed as you can from a possible collision. Then steer around the problem, to the left or right depending on the space available. 240 An emergency like this requires close attention and a quick decision. If you are holding the steering wheel at the recommended 9 and 3 o’clock positions, you can turn it a full 180 degrees very quickly without removing either hand. But you have to act fast, steer quickly, and just as quickly straighten the wheel once you have avoided the object. The fact that such emergency situations are always possible is a good reason to practice defensive driving at all times and wear safety belts properly. Off-Road Recovery You may ﬁnd that your right wheels have dropped off the edge of a road onto the shoulder while you are driving. If the level of the shoulder is only slightly below the pavement, recovery should be fairly easy. Ease off the accelerator and then, if there is nothing in the way, steer so that your vehicle straddles the edge of the pavement. You can turn the steering wheel up to one-quarter turn until the right front tire contacts the pavement edge. Then turn your steering wheel to go straight down the roadway. Passing The driver of a vehicle about to pass another on a two-lane highway waits for just the right moment, accelerates, moves around the vehicle ahead, then goes back into the right lane again. A simple maneuver? Not necessarily! Passing another vehicle on a two-lane highway is a potentially dangerous move, since the passing vehicle occupies the same lane as oncoming traffic for several seconds. A miscalculation, an error in judgment, or a brief surrender to frustration or anger can suddenly put the passing driver face to face with the worst of all traffic accidents — the head-on collision. So here are some tips for passing: • Drive ahead. Look down the road, to the sides, and to crossroads for situations that might affect your passing patterns. If you have any doubt whatsoever about making a successful pass, wait for a better time. 241 • Watch for traffic signs, pavement markings, and lines. If you can see a sign up ahead that might indicate a turn or an intersection, delay your pass. A broken center line usually indicates it is all right to pass, providing the road ahead is clear. Never cross a solid line on your side of the lane or a double solid line, even if the road seems empty of approaching traffic. • Do not get too close to the vehicle you want to pass while you are awaiting an opportunity. For one thing, following too closely reduces your area of vision, especially if you are following a larger vehicle. Also, you will not have adequate space if the vehicle ahead suddenly slows or stops. Keep back a reasonable distance. • When it looks like a chance to pass is coming up, start to accelerate but stay in the right lane and do not get too close. Time your move so you will be increasing speed as the time comes to move into the other lane. If the way is clear to pass, you will have a running start that more than makes up for the distance you would lose by dropping back. And if something happens to cause you to cancel your pass, you need only slow down and drop back again and wait for another opportunity. 242 • If other vehicles are lined up to pass a slow vehicle, wait your turn. But take care that someone is not trying to pass you as you pull out to pass the slow vehicle. Remember to glance over your shoulder and check the blind spot. • Check your vehicle’s mirrors, glance over your shoulder, and start your left lane change signal before moving out of the right lane to pass. When you are far enough ahead of the passed vehicle to see its front in your vehicle’s inside mirror, activate the right lane change signal and move back into the right lane. Remember that your vehicle’s passenger side outside mirror is convex. The vehicle you just passed may seem to be farther away from you than it really is. • Try not to pass more than one vehicle at a time on two-lane roads. Reconsider before passing the next vehicle. • Do not overtake a slowly moving vehicle too rapidly. Even though the brake lamps are not ﬂashing, it may be slowing down or starting to turn. If you are being passed, make it easy for the following driver to get ahead of you. Perhaps you can ease a little to the right. • Loss of Control Let us review what driving experts say about what happens when the three control systems — brakes, steering, and acceleration — do not have enough friction where the tires meet the road to do what the driver has asked. In any emergency, do not give up. Keep trying to steer and constantly seek an escape route or area of less danger. Skidding In a skid, a driver can lose control of the vehicle. Defensive drivers avoid most skids by taking reasonable care suited to existing conditions, and by not overdriving those conditions. But skids are always possible. The three types of skids correspond to your vehicle’s three control systems. In the braking skid, your wheels are not rolling. In the steering or cornering skid, too much speed or steering in a curve causes tires to slip and lose cornering force. And in the acceleration skid, too much throttle causes the driving wheels to spin. A cornering skid is best handled by easing your foot off the accelerator pedal. If your vehicle starts to slide, ease your foot off the accelerator pedal and quickly steer the way you want the vehicle to go. If you start steering quickly enough, your vehicle may straighten out. Always be ready for a second skid if it occurs. Of course, traction is reduced when water, snow, ice, gravel, or other material is on the road. For safety, you will want to slow down and adjust your driving to these conditions. It is important to slow down on slippery surfaces because stopping distance will be longer and vehicle control more limited. While driving on a surface with reduced traction, try your best to avoid sudden steering, acceleration, or braking, including reducing vehicle speed by shifting to a lower gear. Any sudden changes could cause the tires to slide. You may not realize the surface is slippery until your vehicle is skidding. Learn to recognize warning clues — such as enough water, ice, or packed snow on the road to make a mirrored surface — and slow down when you have any doubt. Remember: Any Anti-Lock Brake System (ABS) helps avoid only the braking skid. 243 Driving at Night Night driving is more dangerous than day driving. One reason is that some drivers are likely to be impaired — by alcohol or drugs, with night vision problems, or by fatigue. Here are some tips on night driving. • Drive defensively. • Do not drink and drive. • Adjust the inside rearview mirror to reduce the glare from headlamps behind you. • Since you cannot see as well, you may need to slow down and keep more space between you and other vehicles. • Slow down, especially on higher speed roads. Your vehicle’s headlamps can light up only so much road ahead. In remote areas, watch for animals. If you are tired, pull off the road in a safe place and rest. • • No one can see as well at night as in the daytime. But as we get older these differences increase. A 50-year-old driver may require at least twice as much light to see the same thing at night as a 20-year-old. What you do in the daytime can also affect your night vision. For example, if you spend the day in bright sunshine you are wise to wear sunglasses. Your eyes will have less trouble adjusting to night. But if you are driving, do not wear sunglasses at night. They may cut down on glare from headlamps, but they also make a lot of things invisible. You can be temporarily blinded by approaching headlamps. It can take a second or two, or even several seconds, for your eyes to re-adjust to the dark. When you are faced with severe glare, as from a driver who does not lower the high beams, or a vehicle with misaimed headlamps, slow down a little. Avoid staring directly into the approaching headlamps. 244 Driving in Rain and on Wet Roads Keep the windshield and all the glass on your vehicle clean — inside and out. Glare at night is made much worse by dirt on the glass. Even the inside of the glass can build up a ﬁlm caused by dust. Dirty glass makes lights dazzle and ﬂash more than clean glass would, making the pupils of your eyes contract repeatedly. Remember that the headlamps light up far less of a roadway when you are in a turn or curve. Keep your eyes moving; that way, it is easier to pick out dimly lighted objects. Just as the headlamps should be checked regularly for proper aim, so should your eyes be examined regularly. Some drivers suffer from night blindness — the inability to see in dim light — and are not even aware of it. Rain and wet roads can mean driving trouble. On a wet road, you cannot stop, accelerate, or turn as well because your tire-to-road traction is not as good as on dry roads. And, if your tires do not have much tread left, you will get even less traction. It is always wise to go slower and be cautious if rain starts to fall while you are driving. The surface may get wet suddenly when your reﬂexes are tuned for driving on dry pavement. 245 The heavier the rain, the harder it is to see. Even if your windshield wiper blades are in good shape, a heavy rain can make it harder to see road signs and traffic signals, pavement markings, the edge of the road, and even people walking. It is wise to keep your wiping equipment in good shape and keep your windshield washer ﬂuid reservoir ﬁlled with washer ﬂuid. Replace your windshield wiper inserts when they show signs of streaking or missing areas on the windshield, or when strips of rubber start to separate from the inserts. {CAUTION: Wet brakes can cause accidents. They may not work as well in a quick stop and may cause pulling to one side. You could lose control of the vehicle. After driving through a large puddle of water or a car wash, apply your brake pedal lightly until your brakes work normally. Driving too fast through large water puddles or even going through some car washes can cause problems, too. The water may affect your brakes. Try to avoid puddles. But if you cannot, try to slow down before you hit them. Hydroplaning Hydroplaning is dangerous. So much water can build up under your tires that they can actually ride on the water. This can happen if the road is wet enough and you are going fast enough. When your vehicle is hydroplaning, it has little or no contact with the road. Hydroplaning does not happen often. But it can if your tires do not have much tread or if the pressure in one or more is low. It can happen if a lot of water is standing on the road. If you can see reﬂections from trees, telephone poles, or other vehicles, and raindrops dimple the water’s surface, there could be hydroplaning. Hydroplaning usually happens at higher speeds. There just is not a hard and fast rule about hydroplaning. The best advice is to slow down when it is raining. 246 Driving Through Deep Standing Water Notice: If you drive too quickly through deep puddles or standing water, water can come in through your engine’s air intake and badly damage your engine. Never drive through water that is slightly lower than the underbody of your vehicle. If you cannot avoid deep puddles or standing water, drive through them very slowly. Driving Through Flowing Water {CAUTION: Flowing or rushing water creates strong forces. If you try to drive through ﬂowing water, as you might at a low water crossing, your vehicle can be carried away. (Continued) CAUTION: CAUTION: (Continued) As little as six inches of ﬂowing water can carry away a smaller vehicle. If this happens, you and other vehicle occupants could drown. Do not ignore police warning signs, and otherwise be very cautious about trying to drive through ﬂowing water. Some Other Rainy Weather Tips • Besides slowing down, allow some extra following distance. And be especially careful when you pass another vehicle. Allow yourself more clear room ahead, and be prepared to have your view restricted by road spray. • Have good tires with proper tread depth. See Tires on page 340. 247 Here are ways to increase your safety in city driving: • Know the best way to get to where you are going. Get a city map and plan your trip into an unknown part of the city just as you would for a cross-country trip. • Try to use the freeways that rim and crisscross most large cities. You will save time and energy. See Freeway Driving on page 249. • Treat a green light as a warning signal. A traffic light is there because the corner is busy enough to need it. When a light turns green, and just before you start to move, check both ways for vehicles that have not cleared the intersection or may be running the red light. City Driving One of the biggest problems with city streets is the amount of traffic on them. You will want to watch out for what the other drivers are doing and pay attention to traffic signals. 248 Freeway Driving Mile for mile, freeways — also called thruways, parkways, expressways, turnpikes, or superhighways — are the safest of all roads. But they have their own special rules. The most important advice on freeway driving is: Keep up with traffic and keep to the right. Drive at the same speed most of the other drivers are driving. Too-fast or too-slow driving breaks a smooth traffic ﬂow. Treat the left lane on a freeway as a passing lane. At the entrance, there is usually a ramp that leads to the freeway. If you have a clear view of the freeway as you drive along the entrance ramp, you should begin to check traffic. Try to determine where you expect to blend with the ﬂow. Try to merge into the gap at close to the prevailing speed. Switch on your turn signal, check your mirrors, and glance over your shoulder as often as necessary. Try to blend smoothly with the traffic ﬂow. Once you are on the freeway, adjust your speed to the posted limit or to the prevailing rate if it is slower. Stay in the right lane unless you want to pass. 249 Before changing lanes, check your mirrors. Then use your turn signal. Just before you leave the lane, glance quickly over your shoulder to make sure there is not another vehicle in your blind spot. Once you are moving on the freeway, make certain you allow a reasonable following distance. Expect to move slightly slower at night. When you want to leave the freeway, move to the proper lane well in advance. If you miss your exit, do not, under any circumstances, stop and back up. Drive on to the next exit. The exit ramp can be curved, sometimes quite sharply. The exit speed is usually posted. Reduce your speed according to your speedometer, not to your sense of motion. After driving for any distance at higher speeds, you may tend to think you are going slower than you actually are. Before Leaving on a Long Trip Make sure you are ready. Try to be well rested. If you must start when you are not fresh — such as after a day’s work — do not plan to make too many miles that ﬁrst part of the journey. Wear comfortable clothing and shoes you can easily drive in. Is your vehicle ready for a long trip? If you keep it serviced and maintained, it is ready to go. If it needs service, have it done before starting out. Of course, you will ﬁnd experienced and able service experts in GM dealerships all across North America. They will be ready and willing to help if you need it. Here are some things you can check before a trip: • Windshield Washer Fluid: Is the reservoir full? Are all windows clean inside and outside? • Wiper Blades: Are they in good shape? • Fuel, Engine Oil, Other Fluids: Have you checked all levels? 250 • Lamps: Are they all working? Are the lenses clean? • Tires: They are vitally important to a safe, trouble-free trip. Is the tread good enough for long-distance driving? Are the tires all inﬂated to the recommended pressure? • Weather Forecasts: What is the weather outlook along your route? Should you delay your trip a short time to avoid a major storm system? • Maps: Do you have up-to-date maps? Highway Hypnosis Is there actually such a condition as highway hypnosis? Or is it just plain falling asleep at the wheel? Call it highway hypnosis, lack of awareness, or whatever. There is something about an easy stretch of road with the same scenery, along with the hum of the tires on the road, the drone of the engine, and the rush of the wind against the vehicle that can make you sleepy. Do not let it happen to you! If it does, your vehicle can leave the road in less than a second, and you could crash and be injured. What can you do about highway hypnosis? First, be aware that it can happen. Then here are some tips: • Make sure your vehicle is well ventilated, with a comfortably cool interior. • Keep your eyes moving. Scan the road ahead and to the sides. Check your mirrors and your instruments frequently. If you get sleepy, pull off the road into a rest, service, or parking area and take a nap, get some exercise, or both. For safety, treat drowsiness on the highway as an emergency. • 251 If you drive regularly in steep country, or if you are planning to visit there, here are some tips that can make your trips safer and more enjoyable. • Keep your vehicle in good shape. Check all ﬂuid levels and also the brakes, tires, cooling system, and transmission. These parts can work hard on mountain roads. {CAUTION: If you do not shift down, your brakes could get so hot that they would not work well. You would then have poor braking or even none going down a hill. You could crash. Shift down to let your engine assist your brakes on a steep downhill slope. Hill and Mountain Roads Driving on steep hills or mountains is different from driving in ﬂat or rolling terrain. 252 • Stay in your own lane when driving on two-lane roads in hills or mountains. Do not swing wide or cut across the center of the road. Drive at speeds that let you stay in your own lane. • As you go over the top of a hill, be alert. There could be something in your lane, like a stalled car or an accident. • You may see highway signs on mountains that warn of special problems. Examples are long grades, passing or no-passing zones, a falling rocks area, or winding roads. Be alert to these and take appropriate action. {CAUTION: Coasting downhill in NEUTRAL (N) or with the ignition off is dangerous. Your brakes will have to do all the work of slowing down. They could get so hot that they would not work well. You would then have poor braking or even none going down a hill. You could crash. Always have your engine running and your vehicle in gear when you go downhill. • Know how to go down hills. The most important thing to know is this: let your engine do some of the slowing down. Shift to a lower gear when you go down a steep or long hill. • Know how to go uphill. You may want to shift down to a lower gear. The lower gears help cool your engine and transmission, and you can climb the hill better. 253 Include an ice scraper, a small brush or broom, a supply of windshield washer ﬂuid, a rag, some winter outer clothing, a small shovel, a ﬂashlight, a red cloth, and reﬂective warning triangles. And, if you will be driving under severe conditions, include a small bag of sand, a piece of old carpet, or a couple of burlap bags to help provide traction. Be sure you properly secure these items in your vehicle. Driving on Snow or Ice Most of the time, those places where the tires meet the road probably have good traction. However, if there is snow or ice between the tires and the road, you can have a very slippery situation. You will have a lot less traction, or grip, and will need to be very careful. Winter Driving Here are some tips for winter driving: • Have your vehicle in good shape for winter. • You may want to put winter emergency supplies in your vehicle. Also see Tires on page 340. 254 Accelerate gently. Try not to break the fragile traction. If you accelerate too fast, the drive wheels will spin and polish the surface under the tires even more. The Anti-Lock Brake System (ABS) improves your vehicle’s stability when you make a hard stop on a slippery road. Even though you have ABS, you will want to begin stopping sooner than you would on dry pavement. See Anti-Lock Brake System (ABS) on page 233. • Allow greater following distance on any slippery road. • Watch for slippery spots. The road might be ﬁne until you hit a spot that is covered with ice. On an otherwise clear road, ice patches may appear in shaded areas where the sun cannot reach, such as around clumps of trees, behind buildings, or under bridges. Sometimes the surface of a curve or an overpass may remain icy when the surrounding roads are clear. If you see a patch of ice ahead of you, brake before you are on it. Try not to brake while you are actually on the ice, and avoid sudden steering maneuvers. 255 What is the worst time for this? Wet ice. Very cold snow or ice can be slick and hard to drive on. But wet ice can be even more trouble because it may offer the least traction of all. You can get wet ice when it is about freezing, 32°F (0°C), and freezing rain begins to fall. Try to avoid driving on wet ice until salt and sand crews can get there. Whatever the condition — smooth ice, packed, blowing, or loose snow — drive with caution. If You Are Caught in a Blizzard If you are stopped by heavy snow, you could be in a serious situation. You should probably stay with your vehicle unless you know for sure that you are near help and you can hike through the snow. Here are some things to do to summon help and keep yourself and your passengers safe: • Turn on your hazard ﬂashers. • Tie a red cloth to your vehicle to alert police that you have been stopped by the snow. • Put on extra clothing or wrap a blanket around you. If you do not have blankets or extra clothing, make body insulators from newspapers, burlap bags, rags, ﬂoor mats — anything you can wrap around yourself or tuck under your clothing to keep warm. 256 You can run the engine to keep warm, but be careful. Run your engine only as long as you must. This saves fuel. When you run the engine, make it go a little faster than just idle. That is, push the accelerator slightly. This uses less fuel for the heat that you get and it keeps the battery (or batteries) charged. You will need a well-charged battery (or batteries) to restart the vehicle, and possibly for signaling later on with your headlamps. Let the heater run for a while. Then, shut the engine off and close the window almost all the way to preserve the heat. Start the engine again and repeat this only when you feel really uncomfortable from the cold. But do it as little as possible. Preserve the fuel as long as you can. To help keep warm, you can get out of the vehicle and do some fairly vigorous exercises every half hour or so until help comes. {CAUTION: Snow can trap exhaust gases under your vehicle. This can cause deadly CO (carbon monoxide) gas to get inside. CO could overcome you and kill you. You cannot see it or smell it, so you might not know it is in your vehicle. Clear away snow from around the base of your vehicle, especially any that is blocking the exhaust pipe and/or the fuel operated heater exhaust system, if equipped. And check around again from time to time to be sure snow does not collect there. If your vehicle has a diesel engine and a fuel operated heater, see “Fuel Operated Heater (FOH)” in the diesel engine supplement. Open a window just a little on the side of the vehicle that is away from the wind. This will help keep CO out. 257 If Your Vehicle is Stuck in Sand, Mud, Ice, or Snow In order to free your vehicle when it is stuck, you will need to spin the wheels, but you do not want to spin your wheels too fast. The method known as rocking can help you get out when you are stuck, but you must use caution. {CAUTION: If you let your vehicle’s tires spin at high speed, they can explode, and you or others could be injured. And, the transmission or other parts of the vehicle can overheat. That could cause an engine compartment ﬁre or other damage. When you are stuck, spin the wheels as little as possible. Do not spin the wheels above 35 mph (55 km/h) as shown on the speedometer. Notice: Spinning the wheels can destroy parts of your vehicle as well as the tires. If you spin the wheels too fast while shifting the transmission back and forth, you can destroy the transmission. For information about using tire chains on your vehicle, see Tire Chains on page 359. Rocking Your Vehicle to Get It Out First, turn the steering wheel left and right. That will clear the area around the front wheels. Then shift back and forth between REVERSE (R) and a forward gear, spinning the wheels as little as possible. Release the accelerator pedal while you shift, and press lightly on the accelerator pedal when the transmission is in gear. By slowly spinning the wheels in the forward and reverse directions, you will cause a rocking motion that may free your vehicle. If that does not get your vehicle out after a few tries, it may need to be towed out. If your vehicle does need to be towed out, see Towing Your Vehicle on page 264. 258 Loading Your Vehicle It is very important to know how much weight your vehicle can carry. This weight is called the vehicle capacity weight and includes the weight of all occupants, cargo, and all nonfactory-installed options. Two labels on your vehicle show how much weight it was designed to carry, the Tire and Loading Information label and the Certiﬁcation/Tire label. {CAUTION: Do not load your vehicle any heavier than the Gross Vehicle Weight Rating (GVWR), or either the maximum front or rear Gross Axle Weight Rating (GAWR). If you do, parts on your vehicle can break, and it can change the way your vehicle handles. These could cause you to lose control and crash. Also, overloading can shorten the life of your vehicle. Tire and Loading Information Label Label Example A vehicle speciﬁc Tire and Loading Information label is attached to the center pillar (B-pillar). With the driver’s door open, you will ﬁnd the label attached below the door lock post (striker). The tire and loading information label shows the number of occupant seating positions (A), and the maximum vehicle capacity weight (B) in kilograms and pounds. 259 4. The resulting ﬁgure equals the available amount of cargo and luggage load capacity. For example, if the “XXX” amount equals 1400 lbs and there will be ﬁve 150 lb passengers in your vehicle, the amount of available cargo and luggage load capacity is 650 lbs (1400 − 750 (5 x 150) = 650 lbs). 5. Determine the combined weight of luggage and cargo being loaded on the vehicle. That weight may not safely exceed the available cargo and luggage load capacity calculated in Step 4. 6. If your vehicle will be towing a trailer, the load from your trailer will be transferred to your vehicle. Consult this manual to determine how this reduces the available cargo and luggage load capacity of your vehicle. See Towing a Trailer on page 266 for important information on towing a trailer, towing safety rules and trailering tips. The Tire and Loading Information label also shows the size of the original equipment tires (C) and the recommended cold tire inﬂation pressures (D). For more information on tires and inﬂation see Tires on page 340 and Inﬂation - Tire Pressure on page 348. There is also important loading information on the vehicle Certiﬁcation/Tire label. It tells you the Gross Vehicle Weight Rating (GVWR) and the Gross Axle Weight Rating (GAWR) for the front and rear axle. See “Certiﬁcation/Tire Label” later in this section. Steps for Determining Correct Load Limit 1. Locate the statement “The combined weight of occupants and cargo should never exceed XXX kg or XXX lbs” on your vehicle’s placard. 2. Determine the combined weight of the driver and passengers that will be riding in your vehicle. 3. Subtract the combined weight of the driver and passengers from XXX kg or XXX lbs. 260 Example 1 Example 2 Item Description Total Item Description Total Vehicle Capacity Weight for Example 1 = Subtract Occupant Weight 150 lbs (68 kg) × 2 = Available Occupant and Cargo Weight = 1,000 lbs (453 kg) 300 lbs (136 kg) 700 lbs (317 kg) Vehicle Capacity Weight for Example 2 = Subtract Occupant Weight 150 lbs (68 kg) × 5 = Available Cargo Weight = 1,000 lbs (453 kg) 750 lbs (136 kg) 250 lbs (113 kg) 261 Certiﬁcation/Tire Label Example 3 Item Description Total Vehicle Capacity Weight for Example 3 = Subtract Occupant Weight 200 lbs (91 kg) × 5 = Available Cargo Weight = 1,000 lbs (453 kg) 1000 lbs (453 kg) 0 lbs (0 kg) Refer to your vehicle’s tire and loading information label for speciﬁc information about your vehicle’s capacity weight and seating positions. The combined weight of the driver, passengers, and cargo should never exceed your vehicle’s capacity weight. 262 A vehicle speciﬁc Certiﬁcation/Tire label is found on the rear edge of the driver’s door. The label shows the size of your vehicle’s original tires and the inﬂation pressures needed to obtain the gross weight capacity of your vehicle. This is called Gross Vehicle Weight Rating (GVWR). The GVWR includes the weight of the vehicle, all occupants, fuel, and cargo. The Certiﬁcation/Tire label also tells you the maximum weights for the front and rear axles, called Gross Axle Weight Rating (GAWR). To ﬁnd out the actual loads on your front and rear axles, you need to go to a weigh station and weigh your vehicle. Your dealer can help you with this. Be sure to spread out your load equally on both sides of the centerline. Never exceed the GVWR for your vehicle, or the GAWR for either the front or rear axle. And, if you do have a heavy load, you should spread it out. {CAUTION: Do not load your vehicle any heavier than the Gross Vehicle Weight Rating (GVWR), or either the maximum front or rear Gross Axle Weight Rating (GAWR). If you do, parts on your vehicle can break, and it can change the way your vehicle handles. These could cause you to lose control and crash. Also, overloading can shorten the life of your vehicle. {CAUTION: Things you put inside your vehicle can strike and injure people in a sudden stop or turn, or in a crash. (cid:127) Put things in the cargo area of your vehicle. Try to spread the weight evenly. (cid:127) Never stack heavier things, like suitcases, inside the vehicle so that some of them are above the tops of the seats. (cid:127) Do not leave an unsecured child restraint in your vehicle. (cid:127) When you carry something inside the vehicle, secure it whenever you can. (cid:127) Do not leave a seat folded down unless you need to. Add-On Equipment When you carry removable items, you may need to put a limit on how many people you carry inside your vehicle. Be sure to weigh your vehicle before you buy and install the new equipment. 263 With the proper preparation and equipment, many vehicles can be towed in these ways. See “Dinghy Towing” and “Dolly Towing” following. Here are some important things to consider before you do recreational vehicle towing: • What’s the towing capacity of the towing vehicle? Be sure you read the tow vehicle manufacturer’s recommendations. • How far will you tow? Some vehicles have restrictions on how far and how long they can tow. • Do you have the proper towing equipment? • See your dealer or trailering professional for additional advice and equipment recommendations. Is your vehicle ready to be towed? Just as you would prepare your vehicle for a long trip, you’ll want to make sure your vehicle is prepared to be towed. Towing Towing Your Vehicle Consult your dealer or a professional towing service if you need to have your disabled vehicle towed. See Roadside Assistance Program on page 424. If you want to tow your vehicle behind another vehicle for recreational purposes (such as behind a motorhome), see “Recreational Vehicle Towing” following. Recreational Vehicle Towing Recreational vehicle towing means towing your vehicle behind another vehicle — such as behind a motorhome. The two most common types of recreational vehicle towing are known as “dinghy” (towing your vehicle with all four wheels on the ground) and “dolly” (towing your vehicle with two wheels on the ground and two wheels up on a device known as a “dolly”). 264 If you tow your vehicle with all Dinghy Towing Two-Wheel-Drive Vehicles Notice: four wheels on the ground, the drivetrain components could be damaged. The repairs would not be covered by your warranty. Do not tow your vehicle with all four wheels on the ground. Two-wheel-drive vehicles should not be towed with all four wheels on the ground. Two-wheel-drive transmissions have no provisions for internal lubrication while being towed. All-Wheel-Drive Vehicles Your vehicle was not designed to be towed with all four wheels on the ground. To properly tow these vehicles, they should be placed on a platform trailer with all four wheels off the ground. Notice: Towing an all-wheel-drive vehicle with all four wheels on the ground, or even with only two of its wheels on the ground, will damage drivetrain components. Do not tow an all-wheel-drive vehicle if any of its wheels will be on the ground. Dolly Towing Rear Towing (Rear Wheels Off the Ground) Two-Wheel-Drive Vehicles Use the following procedure to tow your vehicle from the rear: 1. Drive the vehicle onto the dolly. 2. Firmly set the parking brake. See Parking Brake on page 128 for more information. 3. Put the automatic transmission in PARK (P). 4. Follow the dolly manufacturer’s instructions to attach and secure the vehicle being towed to the dolly and then the loaded dolly to the tow vehicle. Make sure the wheels are straight before towing. Use an adequate clamping device to ensure that the front wheels are locked into the straight position. 265 5. Release the parking brake only after the vehicle being towed is ﬁrmly attached to the tow vehicle. 6. Turn the ignition to LOCK. If the tow vehicle will not be started or driven for six weeks or more, remove the battery cable from the negative terminal (post) of the battery to prevent your battery from draining while towing. All-Wheel-Drive Vehicles Your vehicle was not designed to be towed with two wheels on the ground. To properly tow these vehicles, they should be placed on a platform trailer with all four wheels off the ground. Notice: Towing an all-wheel-drive vehicle with all four wheels on the ground, or even with only two of its wheels on the ground, will damage drivetrain components. Do not tow an all-wheel-drive vehicle if any of its wheels will be on the ground. Towing a Trailer {CAUTION: If you do not use the correct equipment and drive properly, you can lose control when you pull a trailer. For example, if the trailer is too heavy, the brakes may not work well — or even at all. You and your passengers could be seriously injured. Pull a trailer only if you have followed all the steps in this section. Ask your dealer for advice and information about towing a trailer with your vehicle. Notice: Pulling a trailer improperly can damage your vehicle and result in costly repairs that would not be covered by your warranty. Always follow the instructions in this section and check with your dealer for more information about towing a trailer with your vehicle. 266 To identify the trailering capacity of your vehicle, you should read the information in “Weight of the Trailer” that appears later in this section. Trailering is different than just driving your vehicle by itself. Trailering means changes in acceleration, braking, handling, durability and fuel economy. Successful, safe trailering takes correct equipment, and it has to be used properly. That’s the reason for this part. In it are many time-tested, important trailering tips and safety rules. Many of these are important for your safety and that of your passengers. So please read this section carefully before you pull a trailer. If You Do Decide To Pull A Trailer If you do, here are some important points: • There are many different laws, including speed limit restrictions, having to do with trailering. Make sure your rig will be legal, not only where you live but also where you’ll be driving. A good source for this information can be state or provincial police. • Consider using a sway control. See “Hitches” later in this section. • Don’t tow a trailer at all during the ﬁrst 500 miles (800 km) your new vehicle is driven. Your engine, axle or other parts could be damaged. • Then, during the ﬁrst 500 miles (800 km) that you tow a trailer, don’t drive over 50 mph (80 km/h) and don’t make starts at full throttle. This helps your engine and other parts of your vehicle wear in at the heavier loads. • See also “Driving on Grades” later in this section. Three important considerations have to do with weight: • • • and the weight on your vehicle’s tires the weight of the trailer the weight of the trailer tongue 267 Tow/Haul Mode Tow/haul is designed to assist while your vehicle is pulling a large or heavy load or trailer. Tow/haul is most useful while pulling such a load in rolling terrain, in stop-and-go traffic, or when you need improved low-speed control, such as when parking. The purpose of the tow/haul mode is to: • Reduce the frequency and improve the predictability of transmission shifts, • provide the same solid shift feel when pulling a heavy load as when the vehicle is unloaded, improve control of vehicle speed while requiring less throttle pedal activity. • Press this button located to the right of the steering wheel on the instrument panel to turn tow/haul mode on and off. While activated, the indicator light on the instrument panel will be on. Tow/haul mode will turn off automatically when the ignition is turned off. See Tow/Haul Mode Light on page 185. Tow/haul is most effective when the vehicle and trailer combined weight is at least 75 percent of the vehicle’s Gross Combined Weight Rating (GCWR). See “Weight of the Trailer” later in this section. Driving with tow/haul activated without a heavy load will cause reduced fuel economy and unpleasant engine and transmission driving characteristics, but will not cause damage. 268 Weight of the Trailer How heavy can a trailer safely be? It depends on how you plan to use your rig. For example, speed, altitude, road grades, outside temperature and how much your vehicle is used to pull a trailer are all important. It can also depend on any special equipment that you have on your vehicle, and the amount of tongue weight the vehicle can carry. See “Weight of the Trailer Tongue” later in this section for more information. Maximum trailer weight is calculated assuming only the driver is in the tow vehicle and it has all the required trailering equipment. The weight of additional optional equipment, passengers and cargo in the tow vehicle must be subtracted from the maximum trailer weight. The following charts show how much your trailer can weigh, based upon vehicle model and options. G1500 Cargo Van 2WD Axle Ratio 4300 V6 5300 V8 3.42 3.42 3.73 Maximum Trailer Weight 4,300 lbs (1 950 kg) 5,900 lbs (2 676 kg) GCWR* 9,500 lbs (4 309 kg) 12,000 lbs (5 443 kg) H1500 Cargo Van AWD Axle Ratio Maximum Trailer Weight GCWR* 5300 V8 G1500 Passenger Van 2WD 4300 V6 5300 V8 3.42 3.73 6,500 lbs (2 948 kg) 12,000 lbs (5 443 kg) Axle Ratio Maximum Trailer Weight GCWR* 3.42 3.42 3.73 3,900 lbs (1 769 kg) 6,300 lbs (2 858 kg) 9,500 lbs (4 309 kg) 12,000 lbs (5 443 kg) 269 H1500 Passenger Van AWD 5300 V8 G2500 Cargo Van 2WD Short Wheelbase 4800 V8 6000 V8 6600 V8 Diesel G2500 Cargo Van 2WD Long Wheelbase 4800 V8 6000 V8 6600 V8 Diesel Axle Ratio Maximum Trailer Weight GCWR* 3.42 3.73 6,100 lbs (2 767 kg) 12,000 lbs (5 443 kg) Axle Ratio Maximum Trailer Weight GCWR* 3.73 4.10 3.73 4.10 3.73 6,300 lbs (2 858 kg) 7,300 lbs (3 311 kg) 8,300 lbs (3 765 kg) 10,000 lbs (4 536 kg) 10,000 lbs (4 536 kg) 12,000 lbs (5 443 kg) 13,000 lbs (5 897 kg) 14,000 lbs (6 350 kg) 16,000 lbs (7 257 kg) 17,000 lbs (7 711 kg) Axle Ratio Maximum Trailer Weight GCWR* 3.73 4.10 3.73 4.10 3.73 6,100 lbs (2 767 kg) 7,100 lbs (3 220 kg) 8,100 lbs (3 674 kg) 10,000 lbs (4 536 kg) 10,000 lbs (4 536 kg) 12,000 lbs (5 443 kg) 13,000 lbs (5 897 kg) 14,000 lbs (6 350 kg) 16,000 lbs (7 257 kg) 17,000 lbs (7 711 kg) 270 G2500 Passenger Van 2WD Short Wheelbase 4800 V8 6000 V8 6600 V8 Diesel G3500 Cargo Van 2WD Short Wheelbase 4800 V8 6000 V8 6600 V8 Diesel G3500 Cargo Van 2WD Long Wheelbase 4800 V8 6000 V8 6600 V8 Diesel Axle Ratio Maximum Trailer Weight GCWR* 3.73 4.10 3.73 4.10 3.73 5,800 lbs (2 631 kg) 6,800 lbs (3 084 kg) 7,800 lbs (3 538 kg) 9,800 lbs (4 445 kg) 10,000 lbs (4 536 kg) 12,000 lbs (5 443 kg) 13,000 lbs (5 897 kg) 14,000 lbs (6 350 kg) 16,000 lbs (7 257 kg) 17,000 lbs (7 711 kg) Axle Ratio Maximum Trailer Weight GCWR* 3.73 4.10 3.73 4.10 3.73 6,200 lbs (2 812 kg) 7,200 lbs (3 266 kg) 8,200 lbs (3 719 kg) 10,000 lbs (4 536 kg) 10,000 lbs (4 536 kg) 12,000 lbs (5 443 k3) 13,000 lbs (5 897 kg) 14,000 lbs (6 350 kg) 16,000 lbs (7 257 kg) 17,000 lbs (7 711 kg) Axle Ratio Maximum Trailer Weight GCWR* 3.73 4.10 3.73 4.10 3.73 6,000 lbs (2 721 kg) 7,000 lbs (3 175 kg) 8,000 lbs (3 629 kg) 10,000 lbs (4 536 kg) 10,000 lbs (4 536 kg) 12,000 lbs (5 443 kg) 13,000 lbs (5 897 kg) 14,000 lbs (6 350 kg) 16,000 lbs (7 257 kg) 18,500 lbs (8 391 kg) 271 G3500 Passenger Van 2WD Short Wheelbase 6000 V8 6600 V8 Diesel G3500 Passenger Van 2WD Long Wheelbase 6000 V8 6600 V8 Diesel Axle Ratio Maximum Trailer Weight GCWR* 3.73 4.10 3.73 7,700 lbs (3 483 kg) 9,700 lbs (4 400 kg) 10,000 lbs (4 536 kg) 14,000 lbs (6 350 kg) 16,000 lbs (7 257 kg) 17,000 lbs (7 711 kg) Axle Ratio Maximum Trailer Weight GCWR* 3.73 4.10 3.73 7,400 lbs (3 357 kg) 9,400 lbs (4 264 kg) 10,000 lbs (4 536 kg) 14,000 lbs (6 350 kg) 16,000 lbs (7 257 kg) 17,000 lbs (7 711 kg) *The Gross Combined Weight Rating (GCWR) is the total allowable weight of the completely loaded vehicle and trailer including any passengers, cargo equipment and conversion. The GCWR for your vehicle should not be exceeded. You can ask your dealer for our trailering information or advice, or you can write us at our Customer Assistance Offices. See Customer Assistance Offices on page 422 for more information. 272 Weight of the Trailer Tongue The tongue load (A) of any trailer is an important weight to measure because it affects the total or gross weight of your vehicle. The Gross Vehicle Weight (GVW) includes the curb weight of the vehicle, any cargo you may carry in it, and the people who will be riding in the vehicle. If you have a lot of options, equipment, passengers or cargo in your vehicle, it will reduce the tongue weight your vehicle can carry, which will also reduce the trailer weight your vehicle can tow. And if you will tow a trailer, you must add the tongue load to the GVW because your vehicle will be carrying that weight, too. See Loading Your Vehicle on page 259 about your vehicle’s maximum load capacity. The trailer tongue weight (A) should be 10 percent to 15 percent of the total loaded trailer weight (B), up to a maximum of 400 lbs (181 kg) with a weight carrying hitch. The trailer tongue weight (A) should be 10 percent to 15 percent of the total loaded trailer weight (B), up to a maximum of 1,000 lbs (454 kg) with a weight distributing hitch. Do not exceed the maximum allowable tongue weight for your vehicle. Choose the shortest hitch extension that will position the hitch ball closest to the vehicle. This will help reduce the effect of trailer tongue weight on the rear axle. 273 After you’ve loaded your trailer, weigh the trailer and then the tongue, separately, to see if the weights are proper. If they aren’t, you may be able to get them right simply by moving some items around in the trailer. Trailering may be limited by the vehicle’s ability to carry tongue weight. Tongue weight cannot cause the vehicle to exceed the GVWR (Gross Vehicle Weight Rating) or the RGAWR (Rear Gross Axle Weight Rating). The effect of additional weight may reduce your trailering capacity more than the total of the additional weight. Consider the following example: A vehicle model base weight is 5,500 lbs (2 495 kg); 2,800 lbs (1 270 kg) at the front axle and 2,700 lbs (1 225 kg) at the rear axle. It has a GVWR of 7,200 lbs (3 266 kg), a RGAWR of 4,000 lbs (1 814 kg) and a GCWR (Gross Combination Weight Rating) of 14,000 lbs (6 350 kg). The trailer rating should be: You can expect tongue weight to be at least 10 percent of trailer weight (850 lbs (386 kg)) and because the weight is applied well behind the rear axle, the effect on the rear axle will be greater than just the weight itself, as much as 1.5 times as much. The weight at the rear axle could be 850 lbs (386 kg) X 1.5 = 1,275 lbs (578 kg). 274 Since the rear axle already weighs 2,700 lbs (1 225 kg), adding 1,275 lbs (578 kg) brings the total to 3,975 lbs (1 803 kg). This is very close to, but within the limit for RGAWR as well. The vehicle is set to trailer up to 8,500 lbs (3 856 kg). But let’s say your speciﬁc vehicle is equipped with some of the latest options and you have a front seat passenger and two rear seat passengers with some luggage and gear in the vehicle as well. You may add 300 lbs (136 kg) to the front axle weight and 400 lbs (181 kg) to the rear axle weight. Your vehicle now weighs: Weight is still below 7,200 lbs (3 266 kg) and you may think that you should subtract 700 additional pounds (318 kg) from your trailering capacity to stay within GCWR limits. Your maximum trailer would only be 7,800 lbs (3 538 kg). You may go further and think you must limit tongue weight to less than 1,000 lbs (454 kg) to avoid exceeding GVWR. But, you must still consider the effect on the rear axle. Because your rear axle now weighs 3,100 lbs (1 406 kg), you can only put 900 lbs (408 kg) on the rear axle without exceeding RGAWR. The effect of tongue weight is about 1.5 times the actual weight. Dividing the 900 lbs (408 kg) by 1.5 leaves you with being able to handle only 600 lbs (272 kg) of tongue weight. Since tongue weight is usually at least 10 percent of total loaded trailer weight, you can expect that the largest trailer your vehicle can properly handle is 6,000 lbs (2 721 kg). It is important that you make sure your vehicle does not exceed any of its ratings — GCWR, GVWR, RGAWR, Maximum Trailer Rating or Tongue Weight. The only way to be sure you are not exceeding any of these ratings is to weigh your vehicle and trailer. 275 Total Weight on Your Vehicle’s Tires Be sure your vehicle’s tires are inﬂated to the upper limit for cold tires. You’ll ﬁnd these numbers on the Certiﬁcation label at the rear edge of the driver’s door or see Loading Your Vehicle on page 259. Then be sure you don’t go over the GVW limit for your vehicle, or the GAWR, including the weight of the trailer tongue. If you use a weight distributing hitch, make sure you don’t go over the rear axle limit before you apply the weight distribution spring bars. Hitches It’s important to have the correct hitch equipment. Crosswinds, large trucks going by and rough roads are a few reasons why you’ll need the right hitch. The rear bumper on your vehicle is not intended for hitches. Do not attach rental hitches or other bumper-type hitches to it. Use only a frame-mounted hitch that does not attach to the bumper. 276 Weight-Distributing Hitches and Weight Carrying Hitches (A) Body to Ground Distance, (B) Front of Vehicle When using a weight-distributing hitch, the hitch must be adjusted so that the distance (A) remains the same both before and after coupling the trailer to the tow vehicle. If you use a step-bumper hitch, your bumper could be damaged in sharp turns. Make sure you have ample room when turning to avoid contact between the trailer and the bumper. If you’ll be pulling a trailer that, when loaded, will weigh more than 5,000 lbs (2 270 kg), be sure to use a properly mounted weight-distributing hitch and sway control of the proper size. This equipment is very important for proper vehicle loading and good handling when you’re driving. You should always use a sway control if your trailer will weigh more than these limits. You can ask a hitch dealer about sway controls. Will you have to make any holes in the body of your vehicle when you install a trailer hitch? If you’re using the wiring provided with the factory-installed trailering package, you should not need to make any holes in the body of your vehicle. However, if you have an aftermarket hitch installed, you may need to make holes in the body. If you do, then be sure to seal the holes later when you remove the hitch. If you don’t seal them, deadly carbon monoxide (CO) from your exhaust can get into your vehicle as well as dirt and water. See “Carbon Monoxide” under Engine Exhaust on page 132. Safety Chains You should always attach chains between your vehicle and your trailer. Cross the safety chains under the tongue of the trailer to help prevent the tongue from contacting the road if it becomes separated from the hitch. Instructions about safety chains may be provided by the hitch manufacturer or by the trailer manufacturer. Follow the manufacturer’s recommendation for attaching safety chains and do not attach them to the bumper. Always leave just enough slack so you can turn with your rig. Never allow safety chains to drag on the ground. Trailer Brakes If your trailer weighs more than 1,000 lbs (450 kg) loaded, then it needs its own brakes – and they must be adequate. Be sure to read and follow the instructions for the trailer brakes so you’ll be able to install, adjust and maintain them properly. Since your vehicle is equipped with StabiliTrak®, your trailer brake system cannot tap into the vehicle’s hydraulic brake system. 277 Driving with a Trailer {CAUTION: If you have a rear-most window open and you pull a trailer with your vehicle, carbon monoxide (CO) could come into your vehicle. You can not see or smell CO. It can cause unconsciousness or death. See Engine Exhaust on page 132. To maximize your safety when towing a trailer: (cid:127) Have your exhaust system inspected for leaks, and make necessary repairs before starting on your trip. (cid:127) Keep the rear-most windows closed. (cid:127) If exhaust does come into your vehicle through a window in the rear or another opening, drive with your front, main heating or cooling system on and with the fan on any speed. This will bring fresh, outside air into your vehicle. CAUTION: (Continued) 278 CAUTION: (Continued) Do not use the climate control setting for maximum air because it only recirculates the air inside your vehicle. See Climate Control System in the Index. Towing a trailer requires a certain amount of experience. Before setting out for the open road, you’ll want to get to know your rig. Acquaint yourself with the feel of handling and braking with the added weight of the trailer. And always keep in mind that the vehicle you are driving is now a good deal longer and not nearly as responsive as your vehicle is by itself. Before you start, check all trailer hitch parts and attachments, safety chains, electrical connector, lamps, tires and mirror adjustment. If the trailer has electric brakes, start your vehicle and trailer moving and then apply the trailer brake controller by hand to be sure the brakes are working. This lets you check your electrical connection at the same time. During your trip, check occasionally to be sure that the load is secure, and that the lamps and any trailer brakes are still working. Following Distance Stay at least twice as far behind the vehicle ahead as you would when driving your vehicle without a trailer. This can help you avoid situations that require heavy braking and sudden turns. Passing You’ll need more passing distance up ahead when you’re towing a trailer. And, because you’re a good deal longer, you’ll need to go much farther beyond the passed vehicle before you can return to your lane. Backing Up Hold the bottom of the steering wheel with one hand. Then, to move the trailer to the left, just move that hand to the left. To move the trailer to the right, move your hand to the right. Always back up slowly and, if possible, have someone guide you. Making Turns Notice: Making very sharp turns while trailering could cause the trailer to come in contact with the vehicle. Your vehicle could be damaged. Avoid making very sharp turns while trailering. When you’re turning with a trailer, make wider turns than normal. Do this so your trailer won’t strike soft shoulders, curbs, road signs, trees or other objects. Avoid jerky or sudden maneuvers. Signal well in advance. 279 Turn Signals When Towing a Trailer When you tow a trailer, your vehicle has to have extra wiring and a heavy-duty turn signal ﬂasher (included in the optional trailering package). The arrows on your instrument panel will ﬂash whenever you signal a turn or lane change. Properly hooked up, the trailer lamps will also ﬂash, telling other drivers you’re about to turn, change lanes or stop. When towing a trailer, the arrows on your instrument panel will ﬂash for turns even if the bulbs on the trailer are burned out. Thus, you may think drivers behind you are seeing your signal when they are not. It’s important to check occasionally to be sure the trailer bulbs are still working. Driving On Grades Reduce speed and shift to a lower gear before you start down a long or steep downgrade. If you don’t shift down, you might have to use your brakes so much that they would get hot and no longer work well. You can tow in DRIVE (D). You may want to shift the transmission to THIRD (3) or a lower gear under heavy loads and/or hilly conditions. When towing at high altitude on steep uphill grades, consider the following: Engine coolant will boil at a lower temperature than at normal altitudes. If you turn your engine off immediately after towing at high altitude on steep uphill grades, your vehicle may show signs similar to engine overheating. To avoid this, let the engine run while parked (preferably on level ground) with the automatic transmission in PARK (P) for a few minutes before turning the engine off. If you do get the overheat warning, see Engine Overheating on page 309. 280 Parking on Hills {CAUTION: You really should not park your vehicle, with a trailer attached, on a hill. If something goes wrong, your rig could start to move. People can be injured, and both your vehicle and the trailer can be damaged. But if you ever have to park your rig on a hill, here’s how to do it: 1. Apply your regular brakes, but don’t shift into PARK (P) yet. Then turn your wheels into the curb if facing downhill or into traffic if facing uphill. 2. Have someone place chocks under the trailer wheels. 3. When the wheel chocks are in place, release the regular brakes until the chocks absorb the load. 4. Reapply the regular brakes. Then apply your parking brake and then shift to PARK (P). 5. Release the regular brakes. When You Are Ready to Leave After Parking on a Hill 1. Apply your regular brakes and hold the pedal down while you: • start your engine, • shift into a gear, and • release the parking brake. 2. Let up on the brake pedal. 3. Drive slowly until the trailer is clear of the chocks. 4. Stop and have someone pick up and store the chocks. 281 Maintenance When Trailer Towing Your vehicle will need service more often when you’re pulling a trailer. See the Maintenance Schedule for more on this. Things that are especially important in trailer operation are automatic transmission ﬂuid (don’t overﬁll), engine oil, axle lubricant, belt, cooling system and brake system. Each of these is covered in this manual, and the Index will help you ﬁnd them quickly. If you’re trailering, it’s a good idea to review these sections before you start your trip. Check periodically to see that all hitch nuts and bolts are tight. Trailer Wiring Harness The optional heavy-duty trailer wiring package includes a seven-wire harness assembly at the rear of the vehicle and a four-wire harness assembly under the left hand side of the instrument panel. The seven-wire harness assembly is taped together and located in a frame pocket at the driver side rear left corner of the frame. The seven-wire harness includes a 30-amp feed wire. Both harnesses come without connectors and should be wired by a qualiﬁed electrical technician. The technician can use the following color code chart when connecting the wiring harness to your trailer and trailer brake controller. Seven-Wire Harness • Light Green: Back-up lamps • Brown: Parking lamps • Yellow: Left stoplamp and turn signal • Dark Green: Right stoplamp and turn signal • Dark Blue: Use for electric trailer brakes • Red/Black Stripe: Trailer accessory • White (heavy gage): Ground wire Four-Wire Harness (Trailer Brake Controller) • Black: Ground • Red/White Stripe: Fused Battery • Dark Blue: Trailer Brake Feed • Light Blue: Fused Stoplamp/CHMSL 282 Section 5 Service and Appearance Care Service ........................................................ 286 Accessories and Modiﬁcations ................... 286 California Proposition 65 Warning .............. 286 Doing Your Own Service Work .................. 287 Adding Equipment to the Outside of Your Vehicle ...................................... 287 Fuel ............................................................. 288 Gasoline Octane ........................................ 288 Gasoline Speciﬁcations .............................. 288 California Fuel ........................................... 289 Additives ................................................... 289 Fuel E85 (85% Ethanol) ............................ 290 Fuels in Foreign Countries ........................ 291 Filling the Tank ......................................... 292 Filling a Portable Fuel Container ............... 294 Checking Things Under the Hood .............. 294 Hood Release ........................................... 295 Engine Compartment Overview .................. 296 Engine Oil (Gasoline Engine) .................... 297 Engine Oil Life System (Gasoline Engine) .................................. 300 Engine Air Cleaner/Filter ............................ 302 Automatic Transmission Fluid .................... 303 Engine Coolant .......................................... 306 Radiator Pressure Cap .............................. 309 Engine Overheating ................................... 309 Cooling System ......................................... 311 Engine Fan Noise ..................................... 317 Power Steering Fluid ................................. 317 Windshield Washer Fluid ........................... 318 Brakes ...................................................... 319 Battery ...................................................... 323 Jump Starting ............................................ 324 All-Wheel Drive ........................................... 330 Rear Axle .................................................... 331 Front Axle ................................................... 331 283 Section 5 Service and Appearance Care Noise Control System ................................. 332 Tampering with Noise Control System Prohibited .............................................. 332 Bulb Replacement ....................................... 334 Halogen Bulbs ........................................... 334 Headlamps ................................................ 334 Front Turn Signal, Sidemarker and Parking Lamps ....................................... 336 Center High-Mounted Stoplamp (CHMSL) ... 336 Taillamps ................................................... 337 Replacement Bulbs ................................... 338 Windshield Wiper Blade Replacement ....... 338 Tires ............................................................ 340 Tire Sidewall Labeling ............................... 341 Tire Terminology and Deﬁnitions ............... 345 Inﬂation - Tire Pressure ............................. 348 Dual Tire Operation ................................... 350 Tire Inspection and Rotation ...................... 351 When It Is Time for New Tires .................. 353 Buying New Tires ...................................... 353 Different Size Tires and Wheels ................ 355 Uniform Tire Quality Grading ..................... 356 Wheel Alignment and Tire Balance ............ 357 Wheel Replacement .................................. 357 Tire Chains ............................................... 359 If a Tire Goes Flat .................................... 360 Changing a Flat Tire ................................. 360 Removing the Spare Tire and Tools .......... 362 Removing the Flat Tire and Installing the Spare Tire ....................................... 365 Secondary Latch System ........................... 371 Storing a Flat or Spare Tire and Tools ...... 375 Spare Tire ................................................. 376 284 Section 5 Service and Appearance Care Appearance Care ........................................ 377 Cleaning the Inside of Your Vehicle .......... 377 Fabric/Carpet ............................................. 378 Instrument Panel, Vinyl, and Other Plastic Surfaces ..................................... 379 Care of Safety Belts .................................. 380 Weatherstrips ............................................ 380 Washing Your Vehicle ............................... 380 Cleaning Exterior Lamps/Lenses ................ 381 Finish Care ............................................... 381 Windshield and Wiper Blades .................... 382 Aluminum Wheels ...................................... 382 Tires ......................................................... 383 Sheet Metal Damage ................................. 383 Finish Damage .......................................... 383 Underbody Maintenance ............................ 384 Chemical Paint Spotting ............................ 384 Vehicle Care/Appearance Materials ............ 385 Vehicle Identiﬁcation .................................. 386 Vehicle Identiﬁcation Number (VIN) ........... 386 Service Parts Identiﬁcation Label ............... 386 Electrical System ........................................ 387 Add-On Electrical Equipment ..................... 387 Headlamp Wiring ....................................... 387 Windshield Wiper Fuses ............................ 387 Fuses and Circuit Breakers ....................... 387 Floor Console Fuse Block ......................... 388 Engine Compartment Fuse Block ............... 390 Capacities and Speciﬁcations .................... 393 285 Service Your dealer knows your vehicle best and wants you to be happy with it. We hope you will go to your dealer for all your service needs. You will get genuine GM parts and GM-trained and supported service people.

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2007 GMC Savana Owners Manual