1996 GMC Sierra Owners Manual

How to Check Lubricant

If the level is below the bottom of the filler plug hole. you'll need to add some lubricant.

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If the differential is at operating temperature (warm), add enough lubricant t o raise the level to the bottom of the filler plug hole. If the differential is cold, add enough lubricant to raise the level to 1/2 inch ( 1 2 mm) below the filler plug hole.

What to Use Refer to the Maintenance Schedule to determine what kind of lubricant to use. See "Recommended Fluids and Lubricants" in the Index. Engine Coolant The cooling system in your vehicle is filled with new DEX-COOL TM (orange-colored, silicate-free) engine coolant. This coolant is designed to remain in your vehicle for 5 years or 100,000 miles ( 1 66 000 km), whichever occurs first. The following explains your cooling system and how to add coolant when it is low. If you have a problem with engine overheating, see "Engine Overheating" in the Index.

A 50/50 mixture of water and the proper coolant for your vehicle will:

Give freezing prorecrlon down to -34°F (-37°C). Give boiling protection up to 265°F (129°C). Protect against rust and corrosion. Help keep the proper engine temperature. Let the warning gages work as they should.

NOTICE:

When adding coolant it is important that you use DEX-COOL TM (orange-colored, silicate-free) coolant meeting GM Specification 6277M. If silicated coolant is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine

coolant will require change sooner -- at 30,000 miles (50 000 km) or 24 months, whichever occurs first.

use a mixture of one-half d u m wwter (preferably distilled) and one-half DEX-COOL” (orange-colored. silicate-free) antifreeze that meets GM Specification 6277M. which won‘t damage aluminum parts. Use GM Engine Coolant Supplement (sealer) (GM Part No. 363462 1 ) with any complete coolant change. If you use this mixture. you don’t need to add anything else.

Adding only plain water to your cooling system can be dangerous. Plain water, or some other liquid like alcohol, can boil before the proper coolant mix will. Your vehicle’s coolant warning system is set for the proper coolant mix. With plain water or the wrong mix, your engine could get too hot but you wouldn’t get the overheat warning. Your engine could catch fire and you or others could be burned. Use a 50150 mix of clean water and DEX-COOL TM (orange-colored, silicate-free) antifreeze.

f 27

NOTICE:

If you use an improper coolant mix, your engine could overheat and be badly damaged. The repair cost wouldn't be covered by your warranty. Too much water in the mix can freeze and crack the engine, radiator, heater core and other parts.

If you have to add coolant more than four times 8 year, have your dealer check your cooling system.

NOTICE:

If you use the proper coolant, you don't have to add extra inhibitors or additives which claim to improve the system. These can be harmful.

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Checking Coolant If your vehicle has a diesel engine, see "Clwcking Coolant" in the Diesel Engine Supplement.

The coolant recovery tank is located on the passenger side at the rear corner of the engine compartment. When your engine i s cold, the coolant level should be at the COLD mark, or a little higher. When your engine is warm. the level sho~~ld be up to the HOT mark, or a little higher.

/rl CAUTION: r -4

Adding Coolant If you need more coolant, add the proper mix ut tho c Y N - h n t Ix~c'olY!l'\: t m k .

A CAUTION:

You can be burned if you spill coolant on hot engine parts. Coolant contains ethylene glycol, and it will burn if the engine parts are hot enough. Don't spill coolant on a hot engine.

\---- Turning the radiator pressure cap when the engine and radiator are hot can allow steam and scalding liquids to blow out and burn you badly. With the coolant recovery tank, you will Never turn the radiator pressure cap -- even a almost never have to add coolant at the radiator. little -- when the engine and radiator are hot.

Add coolant mix at the recovery tank, but be careful not to spill it.

Radiator Pressure Cap (Gasoline Engine)

NOTICE:

Your radiator cap is a 15 psi (105 kPa) pressure-type cap and must be tightly installed to prevent coolant loss and possible engine damage from overheating. Be sure the arrows on the cap line up with the overflow tube on the radiator filler neck.

Thermostat Engine coolant temperature is controlled by a thermostat in the engine coolant system. The thermostat stops the flow of coolant through the radiator until the coolant reaches a preset temperature. When you replace your thermostat, an AC@ thermostat is recommended.

The radiator pressure cap must be tightly installed with the arrows on the cap lined LIP with the overflow tube on the radiator filler neck.

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Power Steering Fluid

When to Check Power Steering Fluid It is not necessary to regularly check power steering fluid unless you suspect there is a leak in the system or you hear an unusual noise. A fluid loss in this system could indicate a problem. Have the system inspected and repaired.

How To Check Power Steering Fluid When the engine cotnparttnent is cool, unscrew the cap and wipe the dipstick with a clean rag. Replace the cap and completely tighten it. Then remove the cap again and look at the fluid level on the dipstick. The level should he at the FULL COLD mark. I f necessary, add only enough fluid to bring the level up to the mark. What to Use Refer to the Maintenance Schedule t o determine what kind of fluid to use. See “Recommended Fluids and Lubricants” i n the Index. Always use the proper fluid. Failure to use the proper fluid can cause leaks and damage hoses and seals. Windshield Washer Fluid What to Use When you need windshield washer fluid, be sure to read the manufacturer’s instructions before use. If you will be operating your vehicle in an area where the tetnperature may fill1 below freezing, use a fluid that has sufficient protection against freezing.

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NOTICE:

When using concentrated washer fluid, follow the manufacturer’s instructions for adding water. Don’t mix water with ready-to-use washer fluid. Water can cause the solution to freeze and damage your washer fluid tank and other parts of the washer system. Also, water doesn’t clean as well as washer fluid. Fill your washer fluid tank only three-quarters full when it’s very cold. This allows for expansion, which could damage the tank if it is completely full. Don’t use radiator antifreeze in your windshield washer. It can damage your washer system and paint.

Adding Washer Fluid

Open the cap labeled WASHER FLUID ONLY. Add washer fluid until the tank is full.

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Brakes Brake Fluid

Your brake master cylinder reservoir is here. It is filled

I with DOT-3 brake fluid.

There are only two reasons why the brake fluid level in the reservoir might go down. The first is that the brake fluid goes down to an acceptable level during normal brake lining wear. When new linings are put in, the fluid level goes back up. The other reason is that fluid i s leaking out of the brake system. If it is, you should have your brake system fixed, since a leak means that sooner or later your brakes won’t work well, or won’t work at a l l .

So, it isn’t a good idea to “top off’ your brake fluid. Adding brake fluid won’t correct a leak. If you add fluid when your linings are worn, then you’ll have too much fluid when you get new brake linings. You should add (or remove) brake fluid, as necessary, only when work is done on the brake hydraulic system.

A CAUTION0

If you have too much brake fluid, it can spill on the engine. The fluid will burn if the engine is hot enough. You or others could be burned, and your vehicle could be damaged. Add brake fluid only when work is done on the brake hydraulic system.

Refer to the Maintenance Schedule to determine when t o check your brake fluid. See “Periodic Maintenance Inspections” in the Index.

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Checking Brake 1

After work is done on the brake hydraulic system, make sure the level is above MIN and below the top of the window.

What to 1 When you do need brake fluid, use only DOT-3 brake fluid -- such as Delco Supreme 11 No. 1052535). Use new brake fluid from a sealed container only, and always clean the brake fluid reservoir cap before removing it.

(GM Part

I A CAUTION:

You can check the brake fluid without taking off the cap. Just look at the window on the brake fluid reservoir. The fluid level should be above MIN. If it isn't, have your brake system checked to see if there is a leak.

With the wrong kind of fluid in your brake system, your brakes may not work well, or they may not even work at all. This could cause a crash. Always use the proper brake fluid.

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NOTICE:

Using the wrong fluid can badly damage brake system parts. For example,.just a few drops of mineral-based oil, such as engine oil, in your brake system can damage brake system parts so badly that they’ll have to be replaced. Don’t let someone put in the wrong kind of fluid. If you spill brake fluid on your vehicle’s painted surfaces, the paint finish can be damaged. Be careful not to spill brake fluid on your vehicle. If you do, wash it off immediately. See &‘Appearance Care” in the Index.

Brake Wear If you have a C 3500 HD model, it has four-wheel disc brakes. Disc brake pads have built-in wear indicators that make a high-pitched warning sound when the brake pads are worn and new pads are needed. The sound may come and go or be heard all the time your vehicle is moving (except when you are pushing on the brake

pedal firmly). A’ CAUTION:

The brake wear warning sound means that sooner or later your brakes won’t work well. That could lead to an accident. When you hear the brake wear warning sound, have your vehicle serviced.

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NOTICE:

Continuing to drive with worn-out brake pads could result in costly brake repair.

Some driving conditions or climates may cause a brake squeal when the brakes are first applied or lightly applied. This does not mean something is wrong with your brakes. Free movement of brake calipers and properly torqued wheel nuts are necessary to help prevent brake pulsation. When tires are rotated, inspect.brake calipers for movement, brake pads for wear, and evenly torque wheel nuts in the proper sequence to GM specifications. If you have rear drum brakes, they don’t have wear indicators, but if you ever hear a rear brake rubbing noise, have the rear brake linings inspected. Also, the rear brake drums should be remoQed and inspected each time the tires are removed for rotation or changing. When you have the front brakes replaced, have the rear brakes inspected, too. Brake linings should always be replaced as complete axle sets.

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Brake Pedal Travel See your dealer if the brake pedal does not return to normal height, or if there is a rapid increase in pedal travel. This could be a sign of brake trouble. Brake Adjustment Every time you make a brake stop, your disc brakes adjust for wear. If your brake pedal goes down farther than normal, your rear drum brakes may need adjustment. Adjust them by backing up and firmly applying the brakes a few times. Replacing Brake System Parts The braking system on a modern vehicle is complex. Its many parts have to be of top quality and work well together if the vehicle is to have really good braking. Vehicles we design and test have top-quality GM brake parts in them, as your vehicle does when it is new. When you replace parts of your braking system -- for example, when- your brhke linings wear do.wn and you have to haye new ones put in -- be sure you get new genuine GM replacement parts. If you don’t, your brakes may no longer work properly. For example, if someone puts in brake linings that are wrong for your vehicle, the balance between your front and rear brakes can change -- for the worse. The braking performance you’ve come to expect can change in many other ways if someone puts in the wrong replacement brake parts.

Battery Every new vehicle has 21 Delco Freedom@ battery. You never have to add water to one of these. When it’s time for a new battery, we recommend a Delco Freedom battery. Get one that has the replacement number shown on the original battery’s label. Vehicle Storage If you’re not going to drive your vehicle for 25 days or more, take off the black, negative (-) cable from the battery. This will help keep your battery from runnine down.

I A CAUTION:

Batteries have acid that can burn you and gas that can explode. You can be badly hurt if you aren’t careful. See “Jump Starting” in the Index for tips on working around a battery without getting hurt.

Contact your dealer t o learn how to prepare your vehicle for longer storage periods. Also, for your audio system, see ”Theft-De-terrent Feature” in the Index. Bulb Replacement Before you replace any bulbs, be sure that all the lamps are off and the engine isn’t running. See “Replacement Bulbs” i n the Index for the proper types of bulbs to use. Halogen Bulbs

-A i F -

Halogen bulbs have prc-arized gas inside and can burst if you drop or scratch the bulb. You or others could be injured. Be sure to read and follow the instructions on the bulb package.

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. -

Headlamps Sealed Beam Lamps

3. Unplug and remove

the headlamp.

1. Remove the four screws

from the headlamp retainer.

2. Pull the headlamp out and remove the retainer.

4. Plug in the new headlamp and put it in place. 5. Install the retainer t o the headlanip and tighten

the screws.

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Composite Headlampc

1. Remove the two

screws at the top of the radiator support.

4. Turn the bulb

counterclockwise and remove it.

2. Pull the headlamp lens assembly out. 3. Unplug the electrical connector.

5. Put the new bulb in the lens assembly and turn it to

the right until it is tight.

6. Plug in the electrical connector. 7. Put the headlamp lens assembly back into the

vehicle. Install and tighten the two screws.

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Front Turn Signal Lamps (Sealed Beam Headlamps)

4. Pull the socket out of the

lamp assembly.

1. Remove the two screws

at the inside edge of the parkinghrn signal lamp assembly.

2. Remove the lamp assembly by swinging it out from the inside edge and sliding it out at the outside edge. 3. Squeeze the tab on the side of the lamp socket while

turning the socket counterclockwise.

5. Push in gently on the bulb, turn it counterclockwise

and remove it from the socket.

6. Put the new bulb in the socket, gently press in on the

bulb and turn it to the right until it is tight.

7. Put the socket back into the lamp assembly and turn

it to the right until it locks.

8. Put the parking/tut-n signal lamp assembly back into

the vehicle and tighten the screws.

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Front Wrn Signal Lamps (Composite Headlamps)

3. Pull the socket out of the

lamp assembly. .

1. Remove the screws and take out the parkinghrn signal lamp assembly.

4. Push in gently on the bulb, turn it counterclockwise

and remove it from the socket.

2. Squeeze the tab on the.side of the lamp socket while

turning the socket counterclockwise.

5. Put the new bulb in the socket, gently press in on the

bulb and turn it to the right 'until it is tight.

6. Put the socket back into the lamp assembly and turn

it socket to the right until it locks.

7. Put the parkinghurn signal lamp assembly back into

the vehicle and tighten the screws.

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Fender Marker Lamps (Dual Rear Wheel Pickup Models)

2. Turn the bulb socket

counterclockwise and remove it from the lens assembly.

3. Pull the bulb straight out of the socket. 4. Put a new bulb into the socket and push it in until

it is tight.

5. Put the socket back into the lens assembly and turn it

clockwise to tighten it.

6. Replace the lens and tighten the screws.

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Sidemarker Lamps

I .

Remove the screws and pull out the parkingkurn signal lamp assembly.

3. Pull the bulb straight out

of the socket.

2. Reach through the opening and turn the sidemarker

bulb socket counterclockwise and remove it.

4. Put a new bulb into the socket and push it in until

it is tight.

5 . Put the socket back into the sidemarker assembly

and turn it clockwise t o tighten it.

6. Replace the parking/turn signal lamp assembly and

tighten the screws.

Center High-Mounted Stoplamp (CHMSL)

3. Put a new bulb into the

socket and push it in until it is tight.

2. Pull the old bulb straight out of the socket.

4. Replace the lens and tighten the screws.

Roof Marker Lamps I. Remove the screws and lift off the lens. 2. Pull the bulb straight out of the socket. 3. Put a new bulb into the socket and push it i n until

it is tight.

4. Replace the lens and tighten the screws. Tailgate Marker Lamps 1. Use a screwdriver to gently pry the lens/buIb

assembly from the lens holder.

2. Unplug the lens/bulb assembly at the connector wire. 3. Plug in a new lendbulb assembly and push the

connector wire into the hole in the tailgate.

4. Snap the lens/buIb assembly into the lens holder.

Taillamps (Pickup Models) I . Open the tailgate.

2. Remove the two

rear lamp assembly screws near the tailgate latch and pull out the lamp assembly.

3. Remove the screws

from the bulb retainer and take it off the lamp assembly.

cp

4. Pull the old bulb straight

out of the socket..

Taillamps (Chassis Cab Models) 1. Using your hands, peel the rubber seal away from

the lens.

2. Lift the lens off the

lamp assembly.

5. 6. 7.

8.

Put in a new bulb and push it in until it is tight. Replace the bulb retainer. Replace the rear lamp assembly and tighten the screws. Close the tailgate.

3. Slide the socket out of the lamp assembly.

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4. Push i n gently o n

the bulb, turn it counterclockwise and remove it from the socket .

indshield Wiper Blade l.Lpldcement

For proper type and length, see "Normal Maintenance Replacement Parts" in the Index. To replace the windshield wiper blade assembly:

..

5 . Put in a new bulb and, pushing in gently, turn it

clockwise until it is tight.

6. Put the socket back in the latnp assembly and replace

the lens and lens seal.

1. Lift the wiper arm and rotate the blade until it is

facing away from the windshield.

2. Push the release lever and slide the wipcr asselnbly

toward the driver's side of the vehicle.

3. Install a new blade by reversing Steps I and 2.

Tires We don’t make tires. Your new vehicle comes with high-quality tires made by a leading tire manufacturer. If you ever have questions about your tire warranty and where to obtain service, see your GM Warranty bookJet for details.

Poorly maintained and improperly used tires are dangerous.

Overloading your tires can cause overheating as a result of too much friction. You could have an airout and a serious accident. See “Loading Your Vehicle” m the Index. Underinflated tires pose the same danger as overloaded tires. The resulting accident could cause serious injury. Check all tires frequently to maintain the recommended pressure. Tire pressure should be checked when your tires are cold. likely to be Overinflated tires are more cut, punctured or broken by a sudden

impact -- such as when you hit a pothole.

Keep tires at the recommended pressure. Worn, old tires can cause accidents. If your tread is badly worn, or if your tires have been damaged, replace them.

Inflation -- Tire Pressure

The Certification/Tire label. which is on the rear edge of the driver's door, or on the incomplete vehicle document in the cab, shows the correct inflation pressures for your tires when they're cold. "Cold" means your vehicle has been sitting for at least three hours or driven no more than I mile ( I .6 km). You can operate some vehicles at reduced inflation pressures only when you'll be carrying reduced loads. On those vehicles, the minimum cold inflation pressures for a typical reduced load are printed on the Improved Ride Tire Pressure label located on the driver's door. Weigh the vehicle to find the load on each tire and see the label for the minimum cold inflation pressures for that load.

1 NOTICE:

~. 1

Don't let anyone tell you that underinflation or overinflation is all right. It's not. If your tires don't have enough air (underinflation), you can get the following:

NOTICE: (Continued)

NOTICE: (Continued)

Too much flexing Too much heat Tire overloading Bad wear Bad handling Bad fuel economy.

if your tires have too much air (overinflation), you can get the following:

Unusual wear Bad handling Rough ride Needless damage from road hazards.

When to Check Check your tires once a month o r more. Also, check the tire pressure of the spare tire,

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How to Check Use a good quality pocket-type gage to check tire pressure. You can’t tell if your tires are properly inflated simply by looking at them. Radial tires may look properly inflated even when they’re underinflated. Be sure to put the valve caps back on the valve stems. They help prevent leaks by keeping out dirt .and moisture. Tire Inspection and Rotation Tires should be inspected every 6,000 to 8,000 miles (10 000 to 13 000 km) for any signs of unusual wear. If unusual wear is present, rotate your tires as soon as possible and check wheel alignment. Also check for damaged tires or wheels. See “When It’s Time for New Tires” and ‘‘Wheel Replacement” later in this section for more information. If your vehicle has dual rear wheels, also see “Dual ‘Tire Operation” later in this section.

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FRT

FRT

The purpose of regular rotation is to achieve more uniform wear for all tires on the vehicle. The first rotation is the most important. See “Scheduled Maintenance Services” in the Index for scheduled rotation intervals. If your vehicle has single rear wheels, always use one of the correct rotation patterns shown here when rotating your tires. If your vehicle has front [Ires with different load ranges or tread designs (such as all season vs. on/off road) than the rear tires, don’t rotate your tires front to rear.

I I

rTl

If your vehicle has dual rear wheels and the load range and tread design for your front tires is the same as your rear tires. always use one of the correct rotation patterns shown here when rotating your tires.

If your vehicle has dual rear wheels and the load range or tread design for your front tires is different from your rear tires, always use the correct rotation pattern shown here when rotating your tires.

The dual tires are rotated as a pair, and the inside rear tires become the outside rear tires. When you install dual wheels, be sure the vent holes in the inner and outer wheels on each side are lined up. After the tires have been rotated, adjust the front and rear inflation pressures as shown on the Certificatiomire label. Make certain that all wheel nuts are properly tightened. See “Wheel Nut Torque” in the Index.

Rust or dirt on a wheel, or on the parts to which it is fastened, can make- wheel nuts become loose .after a time. The wheel could come off and cause an accident. When you change a wheel, remove any rust or dirt from places where the wheel attaches to the vehicle. In an emergency, you can use a cloth or a paper towel to do this; but be sure to use a scraper or wire brush later, if you need to, to get all the rust or dirt off. (See “Changing a Flat Tire” in the

Index.)

When It’s Time for New Tires

One way to tell when it’s time for new tires is to check the treadwear indicators, which will appear when your tires have only 1/16 inch (1.6 mm) or less of tread remaining. Some commercial truck tires may not have treadwear indicators.

Its You need a new tire if any of the following statemen are true: 0 You’can see the indicators at three or more places

around the tire. You can see cord or fabric showing through the tire’s rubber.

0 The tread or sidewall is cracked, cut or snagged deep

enough to show cord or fabric.

0 The tire has a bump, bulge or split. 0 The tire has a puncture, cut or other damage that ,

can’t be repaired well because of the size or location of the damage.

Dual Tire Operation When the vehicle is new, or whenever a wheel, wheel bolt or wheel nut is replaced, check the wheel nut torque after 100, 1,000 and 6,000 miles ( 160, I 600 and IO 000 km) of driving. For proper torque, see "Wheel Nut Torque" i n the Index. The outer tire on a dual wheel setup generally wears faster than the inner tire. Your tires will wear more evenly and last longer if you rotate the tires periodically. If you're going to be doing a lot of driving on high-crown roads, you can reduce tire wear by adding 5 psi (35 kPa) to the tire pressure in the outer tires. Be sure to return to the recommended pressures when no longer driving under those conditions. See "Changing a Flat Tire" i n the Index for more information.

A CAUTION:

If you operate your vehicle with a tire that is badly underinflated, the tire can overheat. An overheated tire can lose air suddenly or catch fire. You or others could be injured. Be sure all tires (including the spare, if any) are properly inflated.

Buying New Tires To find out what kind and size of tires you need, look at the Certificntion/Tire label. Tlze tires installed on your vehicle when it was new had a Tire Performance Criteria Specification (TPC Spec) number on each tire's sidewall. When you get new tires, get ones with that same TPC Spec number. That way your vehicle will continue to have tires that are designed to give proper endurance, handling, speed rating, traction, ride and other things during normal service on your vehicle. If your tires have an all-season tread design, the TPC number will be followed by an "MS" (for mud and snow). If you ever replace your tires with those not having a TPC Spec number, make sure they are the same size, load range, speed rating and construction type (bias, bias-belted or radial) a s your original tires.

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- A CAUTION:

Mixing tires could cause you to lose control while driving. If you mix tires of different sizes or types (radial and bias-belted tires), the vehicle may not handle properly, and you could have a crash. Using tires of different sizes may also cause damage to your vehicle. Be sure to use the same size and type tires on all wheels.

Uniform Tire Quality Grading The following information relates to the system developed by the United States National Highway Traffic Safety Administration, which grades tires by treadwear, traction and temperature performance. (This applies only to vehicles sold in the United States.) The grades are molded on the sidewalls of most passenger car tires. The Uniform Tire Quality Grading system does not apply to deep tread, winter-type snow tires, space-saver or temporary use spare tires, tires with nominal rim diameters of IO to 12 inches (25 to 30 cm), or to some limited-production tires.

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While the tires available on General Motors passenger cars and light trucks may vary with respect to these grades, they must also conform to Federal safety requirements and additional General Motors Tire Performance Criteria (TPC) standards. Treadwear The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified government test course. For example. a tire graded 150 would wear one and a half (1 1/2) times as well on the government course as a tire E at-aded 100. The relative performance of tires depends upon the actual conditions of their use, however, and may depart significantly from the norm due to variations in driving habits, service practices and differences in road characteristics and climate. Traction -- A, B, C The traction grades, from highest to lowest, are A, B, and C, and they represent the tire’s ability to stop on wet pavement as measured under controlled conditions on specified government test surfaces of asphalt and concrete. A tire marked C may have poor traction performance. Warning: The traction grade assigned to this, tire is based on braking (straightahead) traction tests and does not include cornering (turning) traction.

--

A, B, c

Tempera The temperature grades are A (the highest), B, and C, representing the tire’s resistance to the generation of heat and its ability to dissipate heat when tested under controlled conditions on a specified indoor laboratory test wheel. Sustained high temperature can cause the material of the tire to degenerate and reduce tire life, and excessive temperature can lead to sudden tire failure. The grade C corresponds to a level of performance which all passenger car tires must meet under the Federal Motor Vehicle Safety Standard No. 109. Grades B and A represent higher levels of performance on the laboratory test wheel than the minimum required by law. Warning: The temperature grade for this tire is established for a tire that is properly inflated and not overloaded. Excessive speed, underinflation, or excessive loading, either separately or in combination, can cause heat buildup and possible tire failure.

Wheel Alignment and Tire Balance The wheels on your vehicle were aligned and balanced carefully at the factory to give you the longest tire life and best overall performance, In most cases, you will not need to have your wheels aligned again. However, if you notice unusual tire wear or your vehicle pulling one way or the other, the alignment may need to be reset. If you notice your vehicle vibrating when driving on a smooth road, your wheels may need to be rebalanced. Wheel Replacement Replace any wheel that is bent, cracked, or badly rusted or corroded. If wheel nuts keep coming loose, the wheel, wheel bolts and wheel nuts should be replaced. If the wheel leaks air, replace it (except some aluminum wheels, which can sometimes be repaired). See your GM dealer if any of these conditions exist. Your dealer will know the kind of wheel you need.

Each new wheel should have the same load-carrying capacity, diameter, width, offset and be mounted the same way as the one it replaces. If you need to replace any of your wheels, wheel bolts or wheel nuts, replace them only with new GM original equipment parts. This way, you will be sure to have the right wheel, wheel bolts and wheel nuts for your vehicle.

\ CAUTION:

Using the wrong replacement wheels, wheel bolts or wheel nuts on your vehicle can be dangerous. It could affect the braking and handling of your vehicle, make your tires lose air and make you lose. control. You could have a collision in which you or others could be injured. Always use the correct wheel, wheel bolts and wheel nuts for replacement.

NOTICE:

The wrong wheel can also cause problems with bearing life, brake cooling, speedometer or odometer calibration, headlamp aim, bumper height, vehicle ground clearance and tire or tire chain clearance to the body and chassis.

Whenever a wheel, wheel bolt or wheel nut is replaced on a dual wheel setup, check the wheel nut torque after 100, 1,000 and 6,000 miles (160, 1 600 and 10 000 km) of driving. For proper torque, see “Wheel Nut Torque” in the Index. See “Changing a Flat Tire” in the Index for more information.

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Used Replacement Wheels

--

Putting a used wheel .on your vehicle is dangerous. You can’t know how it’s been used or how many miles it’s been driven. It could fail suddenly and cause an accident. If you have to replace a wheel, use a new GM original equipment wheel.

Tire Chains

NOTICE:

If your vehicle has dual wheels or P265/75R16 size tires, don’t use tire chains. They can damage your vehicle. If you don’t have dual wheels or if you have a tire size other than P265/75R16, use tire chains only where legal and only when you must. Use chains that are the proper size for your tires. Install them on the tires of the rear axle. Don’t use chains on the tires of the front axle. Tighten them as tightly as possible with the ends , securely fastened. Drive slowly and follow the chain manufacturer’s instructions. If you can. hear the chains ‘contacting your vehicle, stop and retighten them. If the contact continues, slow dawn until it stops. Driving too fast or spinning the wheels with chains on will damage your vehicle.

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Appear nce CT-e Remember, cleaning products can be hazardous. Some are toxic. Others can burst into flame if you strike a match or get them on a hot part of the vehicle. Some are dangerous if you breathe their fumes in a closed space. When you use anything from’ a container to clean your vehicle, be sure to follow the manufacturer’s warnings and instructions. And always open your doors or windows when you’re cleaning the inside. Never use these to clean your vehicle: 0 Gasoline 0 Benzene 0 Naphtha

Carbon Tetrachloride

0 Acetone 0 Paint Thinner 0 Turpentine 0 Lacquer Thinner 0 Nail Polish Remover They can all be hazardous -- some more than others -- and they can all damage your vehicle, too.

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Don’t use any of these unless this manual says you can. In many uses, these will damage your vehicle: 0 Alcohol

Laundry Soap Bleach

0 Reducing Agents Cleaning the Inside of Your Vehicle Use a vacuum cleaner often to get rid of dust and loose dirt. Wipe vinyl or leather with a clean, damp cloth. Your GM dealer has two GM cleaners, a solvent-type spot lifter and a foam-type powdered cleaner. They will clean normal spots and stains very well. Do not use them on vinyl or leather. Here are some cleaning tips: 0 Always read the instructions on the cleaner label. 0 Clean up stains as soon as you can -- before they set. 0 Use a clean cloth or sponge, and change to a clean area often. A soft brush may be used if stains are stubborn. 0 Use solvent-type cleaners in a well-ventilated area

only. If you use them, don’t saturate the stained area. If a ring forms after spot cleaning, clean the entire area immediately or it will set.

Using Foam-Type Cleaner T 1. Vacuum and brush the area to remove any loose

~.

~.

dirt.

2. Always clean a whole trim panel or section. Ma *

surrounding trim along stitch or welt lines.

3. Mix Multi-Purpose Powdered Cleaner following

the directions on the container label.

4. Use suds only and apply with a clean sponge. 5. Don’t saturate the material. 6. Don’t rub it roughly. 7. As soon as you’ve cleaned the section, use a sponge

to remove the suds.

8. Rinse the section with a clean, wet sponge. 9. Wipe off what’s left with a slightly damp paper

towel or cloth.

10. Then dry it immediately with a blow dryer. 11. Wipe with a clean cloth.

Using Solvent-Type Cleaner on Fabric First, see if you have to use solvent-type cleaner at all. Some spots and stains will clean off better with just water and mild soap. If you need to use a solvent:

Gently scrape excess soil from the trim material with a clean, dull knife or scraper. Use very little cleaner, light pressure and clean cloths (preferably cheesecloth). Cleaning should start at the outside of the stain, “feathering” toward the center. Keep changing to a clean section of the cloth. When you clean a stain from fabric, immediately dry the area with a blow dryer to help prevent a cleaning ring.

Fabric Protection Your vehicle has upholstery and carpet that has been treated with Scotchgard’” Fabric Protector, a 3M product. It protects fabrics by repelling oil and water, which are the carriers of most stains. Even with this protection, you still need to clean your upholstery and carpet often to keep it looking new. Further information on cleaning is available by calling 1-800-433-3296 (in Minnesota, 1-800-642-61 67).

Special Cleaning Problems Greasy or Oily Stains Stains caused by grease, oil, butter, margarine, shoe polish, coffee with cream, chewing gum, cosmetic creams, vegetable oils, wax crayon, tar and asphalt can be removed a s follows: 1. Carefully scrape off excess stain. 2. Follow the solvent-type instructions described earlier. 3. Shoe polish, wax crayon, tar and asphalt will stain if

left on a vehicle’s seat fabric. They should be removed as soon a s possible. Be careful, because the cleaner will dissolve them and may cause them t o spread.

Non-Greasy Stains Stains caused by catsup, coffee (.black), egg, fruit, fruit juice, milk, soft drinks, wine, vomit, urine and blood can be removed as follows: 1. Carefully scrape off excess stain, then sponge the

soiled area with cool water.

2. If a stain remains, follow the foam-type instructions

described earlier.

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3. If an odor lingers after cleaning vomit or urine, treat

the area with a waterhaking soda solution: I teaspoon (5 ml) of baking soda to 1 cup (250 ml) of lukewarm water.

4. If needed, clean lightly with solvent-type cleaner.

Combination Stains Stains caused by candy, ice cream, mayonnaise, chili sauce and unknown stains can be removed as follows: 0 Carefully scrape off excess stain, then clean with

cool water and allow to dry. If a stain remains, clean it with solvent-type cleaner.

Cleaning Vinyl Use warm water and a clean cloth.

Rub with a clean, damp cloth to remove dirt. You may have to do it more than once. Things like tar, asphalt and shoe polish will stain if you don’t get them off quickly. Use a clean cloth and a GM VinyVLeather Cleaner or equivalent product.

Cleaning Leather Use a soft cloth with lukewarm water and a mild soap or saddle soap.

For stubborn stains, use a GM VinyVLeather Cleaner or equivalent product. Never use oils, varnishes, solvent-based or abrasive cleaners, furniture polish or shoe polish on leather. Soiled leather should be cleaned immediately. If dirt is allowed to work into the finish, it can harm the leather.

Cleaning the Top of the Instrument Panel Use only mild soap and water to clean the top surfxes of the instrument panel. Sprays containing silicones or waxes may cause annoying reflections in the windshield and even make it difficult to see through the windshield under certain conditions.

Care of Safety Belts Keep belts clean and dry.

-.

Do not bleach or dye safety belts. If you do, it may severely weaken them. In a crash, they might not be able to provide adequate protection. Clean safety belts only with mild soap and lukewarm water.

Glass Glass should be cleaned often. GM Glass Cleaner (GM Part No. 1050427) or a liquid household glass cleaner will remove normal tobacco smoke and dust films. Don't use abrasive cleaners on glass, because they may cause scratches. Avoid placing decals o n the inside rear window, since they may have to be scraped off later. If abrasive cleaners are used on the inside of the rear window, an electric defogger element may be damaged. Any temporary license should not be attached across the defogger grid.

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Cleaning the Outside of Your Vehicle The paint finish on your vehicle provides beauty, depth of color, gloss retention and durability. Washing Your Vehicle The best way to preserve your vehicle’s finish is to keep it clean by washing it often with lukewarm or cold water. Don’t wash your vehicle in the direct rays of the sun. Don’t use strong soaps or chemical detergents. Use liquid hand, dish or car washing (mild detergent) soaps. Don’t use cleaning agents that are petroleum based, or that contain acid or abrasives. All cleaning agents should be flushed promptly and not allowed to dry on the surface, or they could stain. Dry the finish with a soft, clean chamois or a 100% cotton towel to avoid surface scratches and water spotting. High pressure vehicle washes may cause water to enter your vehicle.

Cleaning the Outside of the Windshield and Wiper Blades If the windshield is not clear after using the windshield washer, or if the wiper blade chatters when running, wax or other material may be on the blade or windshield. Clean the outside of the windshield with GM Windshield Cleaner, Bon-Ami Powder@ (GM Part No. 10500 1 I ). The windshield is clean if beads do not form when you rinse it with water. Clean the blade by wiping vigorously with a cloth soaked in full-strength windshield washer solvent. Then rinse the blade with water. Wiper blades should be checked on a regular basis and replaced when worn. Weatherstrips Silicone grease on weatherstrips will make them last longer, seal better, and not stick or squeak. Apply silicone grease with a clean cloth at least every six months. During very cold, damp weather more frequent application may be required. (See “Recommended Fluids and Lubricants” in the Index.)

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Finish Care Occasional waxing or mild polishing of your vehicle by hand may be necessary to remove residue from the paint finish. You can get GM-approved cleaning products from your dealer. (See “Appearance Care and Materials” in the Index.) Your GM manufactured vehicle may have a “basecoat/clearcoat” paint finish. The clearcoat gives more depth and gloss to the colored basecoat. Always use waxes and polishes that are non-abrasive and made for a basecoat/clearcoat paint finish.

NOTICE:

Machine compounding or aggressive polishing on a basecoatlclearcoat paint finish may dull the finish or leave swirl marks.

Foreign materials such as calcium chloride and other salts, ice melting agents, road oil and tar, tree sap, bird droppings, chemicals from industrial chimneys, etc., can damage your vehicle’s finish if they remain on painted surfaces. Wash the vehicle as soon as possible. If necessary, use non-abrasive cleaners that are marked safe for painted surfaces to remove foreign matter. Exterior painted surfaces are subject to aging, weather and chemical fallout that can take their toll over a period of years. You can help to keep the paint finish looking new by keeping your vehicle garaged or covered whenever possible. Protecting Exterior Bright Metal Parts Bright metal parts should be cleaned regularly to keep their luster. Washing with water is all that is usually needed. However, you may use GM Chrome Polish on chrome or stainless steel trim, if necessary. Use special care with aluminum trim. To avoid damaging protective trim, never use auto or chrome polish, steam or caustic soap to clean aluminum. A coating of wax, rubbed to high polish, is recommended for all bright metal parts.

Aluminum or Chrome Wheels (If So Equipped) Keep your wheels clean using a soft clean cloth with mild soap and water. Rinse with clean water. After rinsing thoroughly, dry with a soft clean towel. A wax may then be applied. The surface of these wheels is similar to the painted surface of your vehicle. Don’t use strong soaps, chemicals, abrasive polishes, abrasive cleaners or abrasive cleaning brushes on them because you could damage the surface. You may use chrome polish on chrome wheels, but avoid any painted surface of the wheel, and buff off immediately after application. Don’t take your vehicle through an automatic vehicle wash that. has silicon carbide tire cleaning brushes. These brushes can also damage the surface of these wheels. Tires To clean your tires, use a stiff brush with a tire cleaner.

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.~

NOTICE:

When applying a tire dressing always take care to wipe off any overspray or splash from all painted surfaces on the body or wheels of the vehicle. Petroleum-based products may damage the paint finish.

Sheet Metal Damage If your vehicle is damaged and requires sheet metal repair or replacement, make sure the body repair shop applies anti-corrosion material to the parts repaired or replaced to restore corrosion protection. Finish Damage Any stone chips, fractures or deep scratches in the finish should be repaired right away. Bare metal will corrode quickly and may develop into a major repair expense. Minor chips and scratches can be repaired with touch-up materials available from your dealer or other service outlets. Larger areas of finish damage can be corrected in your dealer’s body and paint shop.

Underbody Maintenance Chemicals used for ice and snow removal and dust control can collect on the underbody, If these are not removed, accelerated corrosion (rust) can occur on the underbody parts such as fuel lines, frame, floor pan and exhaust system even though they have corrosion protection. At least every spring, flush these materials from the underbody with plain water. Clean any areas where mud and other debris can collect. Dirt packed in closed areas of the frame should be loosened before being flushed. Your dealer or an underbody vehicle washing system can do this for you.

Chemical Paint Spotting Some weather and atmospheric conditions can create a chemical fallout. Airborne pollutants can f d l upon and attack painted surfxes on your vehicle. This damage can take two forms: blotchy, ringlet-shaped discolorations, and small irregular dark spots etched into the paint surface. Although no defect in the paint job causes this, GM will repair, at no charge to the owner, the surfaces of new vehicles damaged by this fallout condition within 12 months or 12,000 miles (20 000 km) of purchase, whichever occurs first. This applies only to materials manufactured and sold by General Motors. Bodies, body conversions or equipment not made or sold by General Motors are not covered.

6-65

Appearance Care Materials Chart

PART NUMBER

1050004 2.75 1050 172 10501 73 1050174

’ SIZE

sq. ft.

16 oz. (0.473 L) 16 oz. (0.473 L) I 16 oz. (0.473 L)

DESCRIPTION

Chamois

Tar and Road Oil Remover Chrome Cleaner and Polish

I White Sidewall Tire Cleaner

See “Fluids and Lubricants” in the Index.

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USAGE

Shines vehicle without scratching

Also removes old waxes and polishes

Removes rust and corrosion Removes. soil and black marks

Vehicle Identification Number (VIN)

Service Parts Identification Label You’ll find this label on the inside of the glove box. It’s very helpful if you ever need to order parts. On this label is:

E N G l N E A 9 9 6 7 -\ ASSEMBLY CODE MODEL YEAR

PLANT

your VIN, the model designation, 0 paint information, and

a list of all production options and special equipment.

Be sure that this label is not removed from the vehicle.

This is the legal identifier for your vehicle. It appears on a plate in the front corner of the instrument panel, on the driver’s side. You can see it if you look through the windshield from outside your vehicle. The VIN also appears on the Vehicle Certification and Service Parts labels and the certificates of title and registration. Engine Identification The eighth character in your VIN is the engine code. This code will help you identify your engine, specifications and replacement parts.

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Electrical System Ac .

.-On Electrical Equipment

NOTICE:

Don’t add anything electrical to your vehicle unless you check with your dealer first. Some electrical equipment can damage your vehicle and the damage wouldn’t be covered by your warranty. Some add-on electrical equipment can keep other components from working as they should.

Your vehicle has an air bag system. Before attempting to add anything electrical to your vehicle, see “Servicing Your Air Bag-Equipped Vehicle” in the Index.

Headlamps The headlamp wiring is protected by an internal circuit breaker. An electrical overload will cause the lamps to go on and off, or in some cases to remain off. I f this happens, have your headlamp wiring checked right away. Windshield Wipers The windshield wiper motor is protected by a circuit breaker and a fuse. If the motor overheats due to heavy snow, etc., the wiper will stop until the motor cools. If the overload is caused by some electrical problem and not snow, etc., be sure to get it fixed. Power Windows and Other Power Options Circuit breakers protect the power windows and other power accessories. When the current load is too heavy, the circuit breaker opens and closes, protecting the circuit until the problem is fixed or goes away.

6-68

~

s and Circuit Breakers

Fu The wiring circuits in your vehicle are protected from short circuits by a combination of fuses, circuit breakers and fusible thermal links. This greatly reduces the chance of fires caused by electrical problems. Look at the silver-colored band inside the fuse. If the band is broken or melted, replace the fuse. Be sure you replace a bad fuse with a new one of the identical size and rating. If you ever have a problem on the road and don’t have a spare fuse, you can borrow one that has the same amperage. Just pick some feature of your vehicle that you can get along without -- like the radio or cigarette lighter -- and use its fuse, if it is the correct amperage. Replace it as soon as you can.

Instrument Panel Fuse Block

The fuse block access door is on the driver’s side edge of the instrument panel. Pull off the cover to access the fuse block.

You can remove fuses with a fuse extractor. The fuse extractor is mounted to the fuse block access door. To remove fuses if you don’t have a fuse extractor, hold the end of the fuse between your thumb and index finger and pull straight out.

Fuse

0 3

0 9 0 l5 0.

0 4 0 l6 0

22

014

0 2 0

Fuse Usage

Stop/TCC Switch, Buzzer, CHMSL, Hazard Lamps, Stoplamps Transfer Case Courtesy Lamps, Cargo Lamp, Glove Box Lamp, Dome/Reading Lamps, Vanity Mirrors, Power Mirrors

10 11 12 13

14

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Usage Instrument Cluster, DRL Relay, Lamp Switch, Keyless Entry, Low Coolant Module, Illuminated Entry Module, DRAC (Diesel Engine) Not Used Cruise Control Auxiliary Power Outlet Air Bag System License Lamp, Parking Lamps, Taillamps, Roof Marker Lamps, Tailgate Lamps, Front Sidemarkers, Fog Lamp Relay, Door Switch Illumination, Fender Lamps, Headlamp Switch Illumination Air Bag System Wiper Motor, Washer Pump A/C, A/C Blower, High Blower Relay Power Amp, Cigarette Lighter, Door Lock Relay, Power Lumbar Seat 4WD Indicator, Cluster, Comfort Controls, Instrument Switches, Radio Illumination, Chime Module

Fuse Usage 15 DRL Relay, Fog Lamp Relay 16

Front and Rear Turn Signals, Back-up Lamps, BTSI Solenoid Radio (Ignition) 4WALNCM, ABS, Cruise Control Radio (Battery) PRNDL, Automatic Transmission, Speedometer, Check Gages Warning Light Not Used Not Used Not Used Front Axle, 4WD Indicator Lamp, TP2 Relay (Gasoline Engine) Power Door Lock, Six-Way Power Seat, Keyless Entry Module Power Windows

17 18 19 20

21 22 23 24

Underhood Fusemelay Center

The underhood fusehelay center is located in the rear of the engine compartment near the brake fluid reservoir. Move the retainer clips for the cover to access the fuse block. You can remove fuses with a fuse extractor. The fuse extractor is mounted to the interior fuse block. To remove fuses if you don’t have a fuse extractor, hold the end of the fuse between your thumb and index finger and pull straight out.

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Fuse GLOW PLUG HORN AUX FAN ECM- 1 A/C ENG- 1

Usage Glow plugs (Diesel Engine)

Horn, Underhood Lamps Auxiliary Fan Injectors, PCM/VCM Air Conditioning Ignition Switch, EGR, Canister Purge, EVRV Idle Coast Solenoid, Heated 0 2 , Fuel Heater (Diesel Engine), Water Sensor (Diesel Engine)

LIGHTING Headlamp and Panel Dimmer Switch,

Fog and Courtesy Fuses Battery, Fuse Block Busbar Ignition Switch Ignition Switch Anti-Lock Brake Module Hi Blower Relay

BATT IGN-A IGN-B ABS BLOWER STOP/HAZ Stoplamps

Fuse Usage ECM-B Fuel Pump, PCM/VCM RR DEFOG Rear Window Defogger IGN-E

Auxiliary Fan Relay Coil, A/C Compressor Relay, Hot Fuel Module, Dual Tanks

FUEL SOL Fuel Solenoid (Diesel Engine)

Replacement Bulbs Exterior Lamps Sealed Beam Headlamps Composite Beam Headlamps Front Marker Lamp Front Parking and Turn Lamp Rear Parking Lamp Rear Stop and Turn Lamp Back-up Lamp Fender Marker Lamp Roof Marker Lamp License Plate Lamp Center High-Mounted Stoplamp Underhood Reel Lamp

Quantity

Number H6054 6052 194

2357NA

3057 3057 3156 194 194 194 92 I 232

Interior Lamps Dome Lamps Reading ‘Lamps Door Courtesy Lamps Four-Wheel-Drive Indicator Four-Wheel-Drive Shift Lever Instrument Panel Compartment Lamp Ashtray Lamp Sunshade Vanity Mirror

Capacities and Specifications

Quantity

Number 21 1-2 21 1-2 194 194 194 194 194 74

Engine

“VORTEC” 4300 “VORTEC” 5000 “VORTEC” 5700 “VORTEC” 7400

Type V6 V8 V8 V8

RPO Code

VIN Code

L35 L30 L3 1 L29

Spark Plug Gap

0.060 inches ( 1.52 mm) 0.060 inches (1.52 mrn) 0.060 inches (1.52 mm) 0.060 inches ( I -52 mm)

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Wheels and Tires Torque Model C 1500, K 1500, C/K 2500, C/K 3500 (Single Rear Wheels) ............................ 140 Ib-ft (190 N-m) C3500 (Dual Rear Wheels) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140 Ib-ft (190 N-m) C-3500HD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175Ib-ft(240N-m) Tire Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . See the Certificationflire label on the rear edge of the driver's door or the incomplete vehicle document in the cab.

Normal Maintenance Replacement Parts Replacement part numbers listed in this section are based on the latest information available at the time of printing, and are subject to change. If a part listed in this manual is not the same as the part used in your vehicle when it was built, or if you have any questions, please contact your GM truck dealer. These specifications are for information only. If you have any questions. see the service manual for the chassis or refer to the body manufacturer's publications. VIN Code Oil Filter Air Cleaner Filter PCV Valve Spark Plugs Fuel Filter Wiper Blades

PF1218T A 130OC CV796C 4 1-932 GF626 22 154886

PF1218 A 1300C c v 7 7 4 c 41 -932 GF626 22 154886

PF1218T A 1300C CV796C 4 1-932 GF626 221 54886

A 1300C CV746C 4 1-932 GF626 22 154886

PF52

Trico

Type Length

Trico 18 inches (45.0 cm)

18 inches (45.0 cm)

?Use a PF52 oil filter if your vehicle has four-wheel drive.

Trico

Trico

18 inches (45.0 cm)

18 inches (45.0 cm)

6-75

J

28.5 quarts (27 L)

Fuel Tank Capacity (Approximate) Quantity Type Short Bed .................... . 2 6 gallons (98 L) Long Bed . . . . . . . . . . . . . . . . . . . .34 gallons (128 L) . . . . . . . . . . . 34 gallons (128 L) Standard Crew Cab Chassis-Cab Side Tank . .I . . . . . . . . 23 gallons (87 L) Chassis-Cab Rear Tank . . . . . . . . . . 17 gallons (64 L) 3500 HD Models Side Tank ....... 23 gallons (87 L) 3500 HD Models Rear Tank . . . . . . . 18 to 20 gallons (68 to.76 L)

-Air Conditioning Refrigerants Not all air conditioning refrigerants are the same. If the air conditioning system in your vehicle needs refrigerant, be sure the proper refrigerant is used. If you’re not sure, ask your GM dealer. See the refrigerant charge label under the hood for information regarding refrigerant capacity.

Section 7 Maintenance Schedule

KEEP ENGINE OIL AT THE PROPER

LEVEL AND CHANGE AS

RECOMMENDED IMPORTANT:

This section covers the maintenance required for your vehicle. Your vehicle needs these services to retain its safety, depe.ndability and emission control performance.

7 - 1

Protection Plan

Introduction Your Vehicle and the Environment Proper vehicle maintenance not only helps to keep your vehicle i n good working condition. but also helps the environment. All 1-ecommended maintenance procedures are important. Improper vehicle maintenance can even affect the quality of the air we breathe. Improper fluid levels or the wrong tire inflation can increase the level of emissions fr6m your vehicle. To help protect our environlnent, and to keep your vehicle i n good condition, please maintain your vehicle properly.

How This Section is Organized The remainder of this section is divided into five parts: “Part A: Scheduled Maintenance Services’’ shows what to have done and how often. Some of these services can be complex, so unless you are technically qualified and have the necessary equipment, you should let your dealer’s service department or another qualified service center do these jobs.

Performing ma~ntenance worK on a vehicle can be dangerous. In trying to do some jobs, you can be seriously injured. Do your own maintenance work only if you have the required know-how and the proper tools and equipment for the job. If you have any doubt, have a qualified technician do the work.

7-2

If you are skilled enough to do some work on your vehicle, you will probably want to get the service information GM publishes. See “Service and Owner Publications” in the Index. “Part B: Owner Checks and Services” tells you what should be checked whenever you stop for fuel. It also explains what you can easily do to help keep your vehicle in good condition. “Part C: Periodic Maintenance Inspections” explains important inspections that your GM dealer’s service department or another qualified service center should perform. “Part D: Recommended Fluids and Lubricants” lists some products GM recommends to help keep your vehicle properly maintained. These products, or their equivalents, should be used whether you do the work yourself or have it done. “Part E: Maintenance Record” provides a place for you to record the maintenance performed on your vehicle. Whenever any maintenance is perf‘ormed, be sure to write it down in this part. This will help you determine when your next maintenance should be done. In addition, it is a good idea to keep your maintenance receipts. They may be needed to qualify your vehicle for warranty repairs.

Part A: Scheduled Maintenance Services Using Your Maintenance Schedule We at General Motors want to help you keep your vehicle in good working condition. But we don’t know exactly how you’ll drive it. You may drive very short distances only a few times a week. Or you may drive long distances all the time in very hot, dusty weather. You may use your vehicle i n making deliveries. Or you may drive it to work, to do errands or in many other ways. Because of all the different ways people use their GM vehicles, maintenance needs vary. You may even need more frequent checks and replacements than you’ll find in the schedules in this section. So please read this section and note how you drive. If you have any questions on how to keep your vehicle in good condition, see your GM dealer. This part tells you the maintenance services you should have done and when you should schedule them. If you go to your dealer for your service needs, you’ll know that GM-trained and supported service people will perform the work using genuine GM parts. The proper fluids and lubricants to use are listed in Part D. Make sure whoever services your vehicle uses

these. All parts should be replaced and all necessary repairs done before you or anyone else drives the vehicle. These schedules are for vehicles that:

carry passengers and cargo within recommended limits. You will find these limits on your vehicle’s CertificatiodTire label. See “Loading Your Vehicle” in the Index. are driven on reasonable road surfaces within legal driving limits. are driven off-road in the recommended manner. See ”Off-Road Driving With Your Four-Wheel-Drive Vehicle” in the Index. use the recommended fuel. See “Fuel” in the Index.

Selecting the Right Schedule First you’ll need to decide which of the two schedules is right for your vehicle. Here’s how to decide which schedule to follow: Gasoline engine vehicles and diesel engine vehicles have different maintenance requirements. If you have a diesel engine, follow a schedule designated for diesel engine vehicles only. See the Diesel Engine Supplement for diesel engine maintenance schedules.

7-3

Maintenance Schedule I Short Trip/City Definition -- Gasoline Engines

Follow the Short Trip/City Maintenance Schedule if any one of these conditions is true for your vehicle:

Most trips are less than 5 to 10 miles (8 to 16 km). This is particularly important when outside temperatures are below freezing.

0 Most trips include extensive idling (such as frequent

driving in stop-and-go traffic).

0 You operate your vehicle in dusty areas or

off-road frequently. You frequently tow a trailer. If the vehicle is used for delivery service, police, taxi or other commercial application.

One of the reasons you should follow this schedule if you operate your vehicle under any of these conditions is that these conditions cause engine oil to break down soonez I Short Trip/City Intervals -- Gasoline Engines Every 3,000 Miles (5 000 km): Engine Oil and Filter

Change (or 3 months, whichever occurs first). Chassis Lubrication (or 3 months, whichever occurs first). Drive Axle Service (or 3 months, whichever occurs first).

7-4

At 6,000 Miles (10 000 km) -- Then Every

12,000 Miles (20 000 km): 'Tire Rotation.

Every 15,000 Miles (25 000 km): Shields and

Underhood Insulation Inspection (GVWR above 8,500 lbs. only). Thermostatically Controlled Engine Cooling Fan Check (or every 12 months, whichever occurs first). Front Wheel Bearing Repack (2WD only) (or at each brake relining, whichever occurs first).

Every 30,000 Miles (50 000 km): Fuel Filter Replacement. Every 50,000 Miles (83 000 km): Automatic

Transmission Service (vehicles over 8600 GVWR or driven under severe conditions only).

Evwy 60,000 Miles (100 000 km): Engine Accessory

Drive Belt Inspection. Fuel Tank, Cap and Lines Inspection. Exhaust Gas Recirculation System Inspection. Evaporative Control System Inspection. Every 100,000 Miles (166 000 km): Cooling System Service (or every 60 months, whichever occurs first). Spark Plug Wire Inspection. Spark Plug Replacement. Positive Crankcase Ventilation (PCV) Valve Inspection.

These intervals only summarize maintenance services. Be sure to follow the complete maintenance schedule on the following pages.

Maintenance Schedule Long Trip/Highway Definition -- Gasoline Engines 1

Follow this maintenance schedule only if none of the conditions from the Short TripKity Maintenance Schedule is true. Driving a vehicle with a fully warmed engine under highway conditions causes engine oil down slower:

to break

I Long Tripmighway Intervals -- Gasoline Engines I Every 7,500 Miles (12 500 km): Engine Oil and Filter Change (or every 12 months, whichever occurs first). Chassis Lubrication (or every 12 months, whichever occurs first). Drive Axle Service. At 7,500 Miles (12 500 km) -- Then Every 15,000 Miles (25 000 km): Tire Rotation. Every 15,000 Miles (25 000 km): Shields and

Underhood Insulation Inspection (GVWR above 8,500 lbs. only). Thermostatically Controlled Engine Cooling Fan Check (or every 12 months, whichever occurs first).

Every 30,000 Miles (50 000 km): Fuel Filter Replacement. Front Wheel Bearing Repack (2WD only) (or at each brake relining, whichever occurs first).

Every 50,000 Miles (83 000 km): Automatic

Transmission Service (vehicles over 8600 GVWR or driven under severe conditions only).

-Every 60,000 Miles (100 000 km): Engine Accessory

Drive Belt Inspection. Fuel Tank, Cap and Lines Inspection. Exhaust Gas Recirculation System Inspection. Evaporative Control System Inspection. Every 100,000 Miles (166 000 km): Cooling System Service (or every 60 months, whichever occurs first). Spark Plug Wire Inspection. Spark Plug Replacement. Positive Crankcase Ventilation (PCV) Valve Inspection. These intervals only summarize maintenance services. Be sure to follow the complete maintenance schedule on the following pages.

7-5

Short TripKity Maintenance Schedule -- Gasoline Engines

The services shown in this schedule up to 100,000 miles (1 66 000 km) should be performed after 100,000 miles (166 000 km) at the same intervals. Footnotes T The U.S. Environmental Protection Agency or the

California Air Resources Board has determined that the failure to perform this maintenance item will not nullify the emission warranty or limit recall liability prior to the completion of the vehicle‘s useful life. We, however, urge that all recommended maintenance services be performed at the indicated intervals and the maintenance be recorded.

# Lubricate the front suspension, kingpin bushings,

steering linkage, transmission shift linkage, transfer case shift linkage, parking brake cable guides, rear driveline center splines, front axle propshaft splines and brake pedal springs. Ball joints and kingpin bushings should not be lubricated unless their temperature is 10°F (- 12°C) or higher, or they could be damaged.

7-6

:f: :1:

Drive axle service: Locking Differential -- Drain fluid and refill at first engine oil change. At subsequent oil changes, check fluid level and add fluid as needed. If driving in dusty areas or towing a trailer, drain fluid and refill every 15,000 miles (25 000 km). Standard Differential -- Check fluid level and add fluid as needed at every oil change. If driving in dusty areas or towing a trailer, drain fluid and refill every I5,OOO miles (25 000 km). More frequent lubrication may be required for heavy-duty or off-road use. 3500 HD Models with applications requiring extreme overload/trailer towing conditions and high-speed (above 45 mph or 70 kmh) conditions for extended periods of time must have the drive axle fluid changed evey 30,000 miles (50 000 km). See “Recommended Fluids and Lubricants’’ in this section.

I Short Trip/City Maintenance Schedule -- Gasoline Engines I 3,000 Miles (5 000 km) c] Change engine oil and filter (or every

6,000 Miles (10 000 km) 0 Change engine oil and filter (or every

3 months, whichever occurs first). An Emission Control Service.

0 Lubricate chassis components; see footnote # (or every 3 months, whichever occurs first). 0 Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. **

3 months, whichever occurs first). An Emission Control Service.

0 Lubricate chassis components; see footnote # (or every 3 months, whichever occurs first). 0 Check readfront axle fluid level and add fluid

as needed. Check constant velocity joints and axle seals for leaking. ** 0 Rotate tires. See “Tire Inspection and Rotation”

in the Index for proper rotation pattern and additional information. During tire rotation, check brake calipers for freedom of movement. Refer to the appropriate GM service manual for proper caliper service procedures. I SERVICED B Y I

I ACTUALMILEAGE

I DATE

7-7

I Short TripKity Maintenance Schedule -- Gasoline Engines I 9,000 Miles (15 000 km) 0 Change engine oil and filter (or every

12,000 Miles (20 000 km) 0 Change engine oil and filter (or every

3 months, whichever occurs first). AII Ermksiorz Control Service.

0 Lubricate chassis components; see footnote ## (or every 3 months, whichever occurs first). 0 Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. **

3 months, whichever occurs first). An Emission Cmatrol Service.

0 Lubricate chassis components; see footnote # (or every 3 months, whichever occurs first). 0 Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. **

7-8

Short Trip/City Maintenance Schedule -- Gasoline Engines 15,000 Miles (25 000 km) 0 Change engine oil and filter (or every

3 months, whichever occurs first). An Emission Control Service.

0 Lubricate chassis components; see footnote # (or every 3 months, whichever occurs first). 0 Check readfront axle fluid level and add fluid as needed. Check constant velocity joints and axle seals for leaking. **

0 For Two-Wheel-Drive vehicles only: Clean and repack the front wheel bearings (or at each brake relining, whichever occurs first). Vehicles With GVWR Above 8,500 lbs.