1994 GMC Sierra Owners Manual

should be at the FULL COLD mark.

What to Add Refer to the Maintenance Schedule to determine what kind of fluid to use. See “Recommended Fluids and Lubricants” in the Index.

NOTICE: When adding power steering fluid or making a complete fluid to use the proper change, always use the proper fluid. Failure fluid can cause leaks and damage hoses and seals.

Hydro-Boost Brake System (Hydraulic Pump) The power steering pump is also used as the Hyrdo-boost pump. Refer to “Power Steering System” in this section when checking fluid level or adding tluid.

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Windshield Washer Fluid

To Add

Open the cap labeled “WASHER FLUID ONLY.” Add washer fluid until the bottle is full.

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 314 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.

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Brakes Brake Master Cylinder

Your brake master cylinder is here. It is filled with DOT-3 brake fluid.

There are only two reasons why the brake fluid level in your master cylinder 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 is 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 all. 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.

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

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To Check Brake Fluid

You can check the brake fluid without taking off the cap. Just look at the windows on the brake fluid reservoir. The fluid levels should be above “MIN.” If they aren’t, have your brake system checked to see if there is a leak.

After work is done on the brake hydraulic system, make sure the levels are above “MIN” and below the top of each window.

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

NOTICE:

Don’t let someone put in the wrong kind of fluid. 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. Brake fluid can damage paint, so be careful not to spill brake fluid on your vehicle. If you do, wash it off immediately. See “Appearance Care” in the Index.

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Brake Wear Your vehicle has front disc brakes and rear drum brakes. 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).

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 serviced.

your vehicle

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. 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 removed 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.

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.

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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 brake linings wear down and you have to have 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. Other Maintenance Hems

Front Suspension and Steering Linkage Your maintenance schedule will tell you how often to lubricate the fittings. See “Recommended Fluids and Lubricants” in the Index for the proper lubricant to use.

Front Wheel Bearings Your vehicle has front wheel bearings that must be cleaned and repacked. Your maintenance schedule will tell you how often this must be done.

Front Shock Absorbers The front shock absorbers of your vehicle do many things. They help the vehicle ride smoothly and also control the travel of the suspension system. When the shock absorbers are serviced, any replacement shock absorbers must be the same as the original equipment shock absorbers in both extended length and strength.

NOTICE: If you use shock absorbers that are not the same as the original shock absorbers, the shock absorbers or suspension system could be damaged.

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Wheel Nut Torque For vehicle with dual wheels, wnen the vehicle, wheel or Tasteners are new, have the torque set at the first 100, 1,000 and 6,000 miles (1 60, 1600 and 9600 km). Use the torque specified in the appropriate Specification Chart later in this section. Single Belt Accessory Drive If your new vehicle uses a serpentine belt, it is lighter and more durable than systems with several belts. The belt runs over or around the pulleys on the engine. A tensioner may be used to keep the belt tight at all times. The tensioner also makes replacing the belt easier. If you need to replace the belt, be sure to get the correct replacement belt. Your dealership or parts supplier can help you with this. The Accessory Drive belt Routing label on your vehicle will show you how to route the belt your vehicle uses. Windshield Wiper Blade Inserts

To replace the windshield wiper blade insert, lift the wiper arm and rotate the blade until it is facing away from the windshield.

Unlatch the end of the insert from the holding clips. Remove the insert and slide a new one in place. Make sure the blade is secured in the clips. Air Conditioning Every now and then have your dealership check your air conditioning system to be sure it has not lost any cooling ability. If you think the system is not working properly, have your dealership check it out as soon as possible. The air conditioning will not work when the temperature is below 40°F (4°C).

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Fluid Leak Check After the vehicle has been parked for a while, inspect the surface under the vehicle for water, oil, fuel or other fluids. Water dripping from the air conditioning system after it has been used is normal. If you notice fuel leaks or fumes, the causes should be found and corrected at once. Lubrication Accelerator Control System Your maintenance schedule will tell you how often the accelerator linkage pivot points must be lubricated. See “Recommended Fluids and Lubricants” in the Tndex for the proper lubricant to use. Accelerator cables and cruise control cables should not be lubricated. Any cab1e.s that are worn or are hard to pull should be replaced.

Hood Latches and Hood Hinge Your maintenance schedule will tell you how often to lubricate the hood latch and hood hinge assembly. See “Recommended Fluids and Lubricants” in the Index for the proper lubricant to use.

Propeller Shaft Slip Splines See your maintenance schedule to find out how often the. slip splines must be lubricated. See “Recommended Fluids and Lubricants” in the Index for the proper lubricant to use.

Constant Velocity Joints See your mamtenance schedule to find out how often the constant velocity joints must be lubricated. See “Recommended Flui-ds and Lubricants” in the Index for the proper lubricant to use.

Body Normal use of your vehicle will cause metal to metal wear at some points on the cab and body if they are not lubricated. For exposed surfaces, such as door checks, door lock bolts, lock striker plates, dovetail bumper wedges, etc., a thin film of engine oil should be applied. The seat adjusters and seat track should be lubricated with chassis grease. Door weather strips and rubber hood bumpers should be wiped clean with a rubber lubricant.

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Never use too much of any lubricant and be sure to wipe up any extra lubricant when you are finished. Your maintenance schedule will tell you how often to lubricant these items. See “Recommended Fluids and Lubricants” in the Index for the proper lubricant to use.

Lock Cylinders To be sure your locks operate properly, they must be lubricated. Your vehicle’s maintenance schedule will tell you how often to lubricate them. See “Recommended Fluids and Lubricants” in the Index for the proper lubricant to use. You should not use penetrating oils because they could wash out the factory installed lubricant and cause the lock to bind. De-icers which contain alcohol could also wash away the lubricant, so be sure to lubricate the lock after using a de-icer of this type.

Tailgate Handle The tailgate handle pivot points on your vehicle should be lubricated to keep the handle working smoothly. Your maintenance schedule will tell you how often to lubricant the handle. See “Recommended Fluids and Lubricants” in the Index for the proper lubricant to use. Battery Every new GM vehicle has a 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 catalog 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 running down.

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for longer storage

Contact your dealer to learn how to prepare your vehicle periods. Bulb Replacement Before you replace any bulbs, be sure that all the lights are engine isn’t running. Sealed Beam Headlights

off and the

1. Remove the four screws from the headlight retainer. 2. Pull the headlight out and remove the retainer.

3.

4.

5.

Unplug and remove the headlight. Plug in the new headlight and put it in place. Install the retainer to the headlight and tighten the screws.

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Halogen Bulbs

NOTICE: Avoid touching the bulb or letting it come in contact with anything damp. Oil from your skin or moisture on the bulb can cause the bulb to explode when it is turned on. If either comes in contact with the bulb, clean it with alcohol or a suitable degreaser and wipe the bulb dry.

Composite Headlights

1.

2.

Remove the two screws at the top of the radiator support. Pull the headlight lens assembly out.

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3. Unplug the

electrical connector.

4. Turn the bulb to

the left and remove it.

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 headlight lens assembly back into the vehicle. Install and

tighten the two screws.

Front Parkingflurn Signal Lights with Sealed Beam Headlights 1. Remove the two screws at the inside edge of the parking/turn signal

light assembly.

2. Remove the light 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 light socket while turning the socket

to the left.

4. Pull the socket out of the light assembly. 5. Push in gently on the bulb, turn it to the left 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 light assembly and turn it to the right until

it locks.

8. Put the parking/turn signal light assembly back into the vehicle and

tighten the screws.

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Front Parkingnurn Signal Lights with Composite Headlights

I . Remove the

screws and take out the parkinghurn signal light assembly.

- 7

2. Squeeze the tab on the side of the light socket while turning the socket to the left.

3.

4.

Pull the socket out of the light assembly. Push in gently on the bulb, turn it to the left and remove it from the socket.

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 light assembly and turn it socket to the

right until it locks.

7. Put the parkinghrn signal light assembly back into the vehicle and

tighten the screws.

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Side Marker Lights with Sealed Beam and Composite Headhghts

1. Remove the

screws and pull out the parkinghrn signal light assembly.

2. Reach through the opening and turn the side marker bulb socket to the left and remove it.

3.

4.

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

5. Put the socket back into the side marker assembly and turn it to the

right to tighten it.

6. Replace the parkinghurn signal light assembly and tighten the screws.

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Fender Marker Lights- Dual Rear Wheel Pickup Models

1.

Remove the screws and take the fender marker assembly out of the fender.

2.

3.

Turn the bulb socket to the left and remove it from the lens assembly. 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 to the right to

tighten it.

6. Replace the lens and tighten the screws.

Tailgate Marker Lights

Roof Marker Lights

4. Replace the lens and tighten the screws.

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1. Use a screwdriver to gently pry the lenshulb assembly from the lens holder.

2. Unplug the

lenshulb assembly at the connector wire.

3. Plug in a new

lensbulb assembly and push the connector wire into the hole in the tailgate.

4. Snap the lenshulb assembly into the lens holder.

1. 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 in until it is tight.

Cargo LighKenter High Mount Stoplamp (CHMSL)

1. Remove the

screws and lift off the lens.

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

3. Put a new bulb into the socket and push it in until it is tight.

4. Replace the lens and tighten the screws.

1. Open the tailgate. 2. Remove the two

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

Rear Lights - Pickup Models

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3. Remove the

screws from the bulb retainer and take it off the light assembly.

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

5. Put in a new bulb

6. Replace the bulb

retainer.

7. Replace the rear light assembly and tighten the screws. 8. Close the tailgate. Rear Lights - Chassis Cab Models

:F

1 . Using your

hands. peel the rubber seal away from the lens.

2. Lift the lens off

the light assembly.

3 . Slide the socket out of the light assernbly.

I,.

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4. Push in gently on the bulb, turn it to the left and remove it from the socket.

5. Put in a new bulb

and, pushing in gently, turn it to the right until it is tight.

6. Put the socket back in the light assembly and replace the lens and lens

seal.

Fuses and Circuit Breakers The wiring circuits in your vehicle are protected from short circuits by a combination of fuses, circuit breakers, and fusible thermal links wiring itself. This greatly reduces the chance of fires caused by electrical problems. See “Fuses and Circuit Breakers” in the Index information.

for more

in the

Headlights The headlight wiring is protected by a circuit breaker in the light switch. electrical overload will cause the lights to flicker on and off, or cases to remain off. If this happens, have your headlight wiring checked right away.

in some

An

Windshield Wipers fuse. If The windshield wiper motor is protected by a circuit breaker and a the motor overheats due to heavy snow, etc., the wiper will stop until the motor cools. Although the circuit is protected from electrical overload, overload due to heavy snow, etc., may cause .wiper linkage damage. Always clear ice and heavy snow from the the windshield before using the windshield wipers. 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 in the fuse panel protect the power windows and other power accessories. When the current load is too heavy, the circuit breaker opens and closes. This protects the circuit until the current load returns to normal or the problem is fixed .

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Trailer Wiring Harness The optional seven-wire trailer wiring harness is protected by an in-line fuse in the battery feed wire. This fuse is near the junction block. See “Trailer Wiring Harness” in the Index for more information.

Fuse Block

The fuse block is behind an access door at the bottom of the instrument panel, next to the parking brake release lever.

To remove fuses if you don’t have one, hold the end of the fuse between your thumb and index finger and pull straight out. Be, sure to use the correct fuse. If you ever have a problem on the road and don’t have a spare fuse, you can “borrow” one of the correct value. Just pick some feature of your vehicle that you can get along without-like the radio its fuse, if it is of the value you need. Replace or cigarette lighter--and use it as soon as you can. See “Fuses and Circuit Breakers“ in the Index for more information.

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Exhaust System To help prevent damage to your exhaust system, do not continue to drive your vehicle if you notice:

Engine misfiring Loss of performance

0 Other unusual operating conditions

Have your engine and exhaust system serviced regularly.

Three- Way Catalytic Converter (gas engines) Your vehicle’s three-way catalytic converter is designed to reduce the pollutants in your vehicle’s exhaust. Use only unleaded fuel in your vehicle. If you use leaded fuel, you could damage your three-way catalytic converter and other engine components.

Three- Way Catalytic Converter (diesel engines) Your vehicle’s thre.e-way catalytic converter is designed to reduce the particulates in your vehicle’s exhaust. If your vehicles three-way catalytic converter ever needs to be replaced, it must be replaced with a three-way catalytic converter intended for use with diesel engines only.

Engine Control Module System (All TBI equipped vehicles and diesel engine vehicles below 8,500 Ibs. GVWR)

Gasoline Engines This system has an oxygen sensor (02 ) that helps keep your engine’s air-fuel mixture at a proper level. Use only unleaded fuel in your vehicle. If you use leaded fuel, you could damage your oxygen sensor (02) and three-way catalytic converter.

Diesel Vehicles Below 8,500 LBS. GVWR This system monitors engine speed and throttle position. It adjusts exhaust gas recirculation to limit emissions.

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Malfunction Indicator (SERVICE ENGINE SOON) Lamp The Malfunction Indicator (SERVICE ENGINE SOON) Lamp on your instrument panel lets you know when your emission system needs service. The light will come on briefly when you start your engine to let you know that the system is working. If it does not come on when you start your engine, or if it comes on and stays on while you’re driving, your system may need service. Your vehicle should still be driveable, but you should have your system serviced right away.

Secondary Air hjection Reaction (AIR) System You may have this system. It has a control valve that will direct air to where it is needed. If the AIR system needs service, your Malfunction Indicator (SERVICE ENGINE SOON) Lamp on your instrument panel will come on. Loading Your Vehicle

BlKG

The Certification/Tire label is found on the rear edge of the driver’s door or in the Incomplete Vehicle Document in the cab.

SEE OWNERS MANUAL FOR ADDITIONAL INFORMATION

The label shows the size of your original tires and the inflation pressures needed to obtain the gross weight capacity of your vehicle. This is called the GVWR (Gross Vehicle Weight Rating). 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.

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A CAUTION:

In the case of a sudden stop or collision, things carried in the bed of your truck could shift forward and come into the passenger area, injuring you and others. If you put things in the bed of your truck, you should make sure they are properly secured.

A CAUTION:

Do not load your vehicle any heavier than the GVWR or the maximum front and rear GAWRs. If you do, parts on your vehicle-can break, or it can change the way your vehicle handles. These could cause you to lose control. Also, overloading can shorten the Iife of your vehicle.

Using heavier suspension components to get added durability might not change your weight ratings. Ask your dealer to help you load your vehicle the right way.

NOTICE: Your warranty does not cover parts or components that fail because of overloading.

If you put things inside your vehicle-like anything else-they turn quickly, or if there is a crash, they’ll keep going.

suitcases, tools, packages, or go as fast as the vehicle goes. If you have to stop or

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Trailering Package

If your vehicle comes with the Trailering Package, there is also a load rating which includes the weight of the vehicle and the trailer it tows. This rating is called the Gross Combination Weight Rating (GCWR). When you weigh your trailer, be sure to include the weight of everything you put in it. And, remember to figure the weight of the people inside as part of your load. Your dealer can help you determine your GCWR.

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Add-on Equipment When you carry removable items, like snow plow blades, 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.

NOTICE: Your warranty doesn’t cover parts or components that fail because of overloading.

Truck-Camper Loading Information Open your glove box door and look for this label:

This label will tell you how much of a load your vehicle can carry, and how to spread out your load the right way. Also, it will help you match the right slide-in camper to your vehicle. When you carry a slide-in camper, the total cargo load of your vehicle is the weight of the camper, plus

everything else added to the camper after it left the factory;

0 everything in the camper: and 0 all the people inside.

The Cargo Weight Rating (CWR) is the maximum weight of the load your vehicle can carry. It doesn’t include the weight of the people inside. But, you can figure about 150 pounds for each seat. The total cargo load must not be more than your vehicle‘s CWR.

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TRUCK LOADING INFORMATION

I . Recommended

location for cargo center of gravity for cargo weight rating (Pickup Truck).

0 Refer to the Truck Camper Loading Information label in glove box for

“A”and “B” dimensions. Use the rear edge of the load floor for measurement purposes.

EXAMPLE OF PROPER TRUCK AND CAMPER MATCH

1 . Camper center of

gravity

2. Recommended center of gravity location zone.

The camper’s center of gravity should fall within the center of gravity zone for your vehicle’s cargo load. You must weigh any accessories or other equipment that you add to your vehicle. Then, subtract this extra weight from the CWR. This extra weight may shorten the center of gravity zone of your vehicle. Your dealer can help you with this. If your slide-in camper and its load weigh less than the CWR, the center of gravity zone for your vehicle may be larger. Your dealer can help you make a good vehicle-camper match. He’ll also help you determine your CWR.

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After you’ve loaded your vehicle and camper, drive to a weigh station and weigh on the front and rear wheels separately. This will tell you the loads on your axles. The loads on the front and rear axles shouldn’t be more than either of the GAWRs. The total of the axle loads should not be more than the GVWR. Open your driver’s door and look at the CertificatiodTire label to find out your CWAR and GVWR. If you’ve gone over your weight ratings, move or take out some things until all the weights fall below the ratings. Of course, you should always tie down any loose items when you load your vehicle or camper. When you install and load your slide-in camper, check the manufacturer’s instructions. If you want more information on curb weights, cargo weights, cargo weight rating and the correct center of gravity zone for your vehicle, your dealer can help you. Just ask for a copy of “Consumer Information, Truck-Camper Loading.”

Trailer Recommendations You must subtract your hitch loads from the CWR for your vehicle. Weigh your vehicle with the trailer hitch attached, so that you won’t go over the GVWR or the GAWR. You’ll get the best performance if you spread out the weight of your load the right way, and if‘ you choose the correct hitch and trailer brakes. For more information, see “Trailer Towing’’ in the Index. Pickup Conversion To Chassis Cab General Motors is aware that some vehicle owners may consider having the pickup box removed and a commercial or recreational body installed. Before you do so, first contact the GM Zone Office for your area for information on such conversions. (See the “Warranty and Owner Assistance” booklet for Zone Office.) Owners should be aware that, as manufactured, there are differences between a chassis cab and a pickup with the box removed which may affect vehicle safety. The components necessary to adapt the pickup to permit its safe use with a specialized body should be installed by a body builder in accordance with the information available from the Zone Office.

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Tires We don’t make tires. Your new vehicle comes with high quality tires made by a leading tire manufacturer. These tires are warranted by the tire manufacturers and their warranties are delivered with every new vehicle. If your spare tire is a different brand than your road tires, you will have a tire warranty folder from each of these manufacturers.

Inflation - Tire Pressure The Certificatioflire 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 a mile. 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

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find the load on each tire and see the label for the minimum cold inflation pressures for that load.

NOTICE: 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:

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:

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

When io Check Check your tires once a month or more. Also, check the tire pressure of the spare tire.

How to Check Use a good quality pocket-type gage to check tire pressure. Simply looking at the tires will not tell you the pressure, especially if you have radial tires - which may look properly inflated even if they’re underinflated. If your tires have valve caps, be sure to put them back on. They help prevent leaks by keeping out dirt and moisture.

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Special Tire lnflation

If you have 16 inch tires on your vehicle, and:

- You’ll be driving for very long at speeds of 66 mph (105 km/h) to

75 mph (120 km/h) where legal, inflate tires to 10 psi (70 kPa) more than the recommended cold inflation pressures.

- You’ll be driving for very long at speeds of 76 mph (120 km/h) to

85 mph (135 km/h) where legal, cold inflation pressures should be increased by 10 psi (70 kPa) and you must also reduce axle load capacity by 10%. Do not drive over 85 mph (135 km/h) even if it’s legal.

Inflation pressures should never exceed 10 psi (70 kPa) above the inflation specified for the maximum load of the tire. If you have 19.5 inch radial tires on your vehicle, and:

- You’ll be driving for very long at speeds of 66 mph (105 km/h) to

70 mph (110 km/h) where legal, inflate tires to 5 psi (35 kPa) more than the recommended cold inflation pressures, and reduce the axle load capacity by 4%.

- You’ll be driving for very long at speeds of 7 1 mph (1 15 km/h) to

75 mph (120 km/h) where legal, cold inflation pressures should be increased by 5 psi (35 kPa) and you must also reduce axle load capacity by 12%. Do not drive over 75 mph (120 km/h) even if it’s legal.

Inflation pressures should never exceed 20 psi (140 kPa) above the inflation specified for the maximum load of the tire.

Tire Inspection and Rotation To make your tires last longer, have them inspected and rotated at the mileages recommended in the Maintenance Schedule. See “Scheduled Maintenance Services” in the Index.

FRT

8 FRT

Use this rotation pattern.

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If your vehicle has front tires with different load ratings or tread designs (such as all season vs. on/off road) than the rear tires, don’t rotate your tires front to rear. After the tires have been rotated, adjust the front and rear inflation pressure as shown on the CertificatiodTire label. Make certain that all wheel nuts are properly tightened. See “Wheel Nut Torque” in the Index.

A CAUTION:

Rust or dirt on a wheel, or on the parts to which it is fastened,

When It’s Time for New Tires

TREAD WEAR INDICATORS 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 2/32 inch (1.6 mm) or less of tread remaining.

You need a new tire if:

0 You can see the indicators at three or more places around the tire. 0 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. The tire has a bump, bulge or split. The tire has a puncture, cut, or other damage that can’t be repaired well because of the size or location of the damage.

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Dual Tire Rotation

Use one of these patterns if you have the same tire sizes and load ranges on the front and rear.

Use this pattern if your front and rear tires are different sizes or load ranges. The dual rear 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 wheels are lined UP.

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Dual lire Operation If your vehicle has dual rear wheels, the outer tire will usually wear 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.

Buying New Tires To find out what kind and size of tires you need, look at the CertificationRire label. The 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 a “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) as your original tires.

6-76

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.)

Treadwear The treadwear grade is a comparative rating based on the wear 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 graded 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.

rate of the

is based on braking

Traction -A, B, C The traction grades, from highest to lowest are: A, B, and C. 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 (straight-ahead) traction tests and does not include cornering (turning) traction. Temperature - A, B, C 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 law. Warning: The temperature grade for this tire is established for a tire that is properly inflated a d not overloaded. Excessive speed, underinflation, or excessive loading, either separately or in combination, can cause heat buildup and possible tire failure. These grades are molded on

the sidewalls of passenger car tires.

the minimum required by

6-77

While the tires available as standard or optional equipment on General Motors vehicles may vary with respect to these grades, all such tires meet General Motors performance standards and have been approved for use on General Motors vehicles. All passenger type (P Metric) tires must conform to Federal safety requirements in addition to these grades.

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 Repla@ Z m wheel that is bent, cracked or badly rusted. 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 GM model.

6-78

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

Used Replacement Wheels

Tire Chains

NOTICE: If your vehicle has dual wheels or LT26Y75R16 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 LT265/75R16, use tire chains only where legal and only when you must. Use only SAE Class “S” type chains that are the proper size for your tires. Install them on the tires of the rear 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 down until it stops. Driving too fast with chains on will damage your vehicle.

6-79

Appearance Care

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 0 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.

NOTICE: Don't use any of these unless this manual says you can. In many uses, these will damage your vehicle: 0 Laundry Soap

Bleach Reducing Agents

6-80

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:

Always read the instructions on the cleaner label.

0 Clean up stains as soon as you can - before they set.

Use a clean cloth or sponge, and change to a clean area often. A soft brush may be used if stains are stubborn. Use solvent-type cleaners in a well-ventilated area only. If you use them, don’t saturate the stained area.

0 If a ring forms after spot cleaning, clean the entire area immediately or

it will set.

Using Foam-Type CIeaner on Fabric 0 Vacuum and brush the area to remove any loose dirt.

Always clean a whole trim panel or section. Mask surrounding trim along stitch or welt lines. Mix Multi-Purpose Powdered Cleaner following the directions on the container label. Use suds only and apply with a clean sponge. Don’t saturate the material. Don’t rub it roughly. As soon as you’ve cleaned the section, use a sponge to remove the suds. Rinse the section with a clean, wet sponge. Wipe off what’s left with a slightly damp paper towel or cloth. Then dry it immediately with a blow dryer or a heat lamp.

I NOTICE:

fabric.

I Be careful with a hair dryer or heat lamp. You could scorch the

Wipe with a clean cloth.

6-81

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:

0 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.

0 When you clean a stain from fabric, immediately dry the area with an air hose, hair dryer, or heat lamp to help prevent a cleaning ring. (See the previous NOTICE.)

Fabric Protection Your vehicle has upholstery and trim carpet that has been treated with Scotchgard TM Fabric Protector, a 3M product. Scotchgard TM 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 trim carpet often to keep it looking new. Further information on cleaning is available by calling 1-800-433-3296 (in Minnesota, 1-800-642-6 167).

Special Cleaning Problems

Greasy or Oily Stains Such as grease, oil, butter, margarine, shoe polish, coffee with cream, chewing gum, cosmetic creams, vegetable oils, wax crayon, tar and asphalt.

0 Carefully scrape off excess stain.

Follow the solvent-type instructions described earlier.

0 Shoe polish, wax crayon, tar and asphalt will stain if left on a vehicle seat fabric. They should be removed as soon as possible. Be careful, because the cleaner will dissolve them and may cause them to spread.

Non-Greasy Stains Such as catsup, coffee (black), egg, fruit, fruit juice, milk, soft drinks, wine, vomit, urine and blood.

Carefully scrape off excess stain, then sponge the soiled area with cool water.

0 If a stain remains, follow the foam-type instructions described earlier.

6-82

0 If an odor lingers after cleaning vomit or urine, treat the area with a

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

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

Combination Stains Such as candy, ice cream, mayonnaise, chili sauce and unknown stains.

Carefully scrape off excess stain, then clean with cool water and allow to dry.

0 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.

0 Things like tar, asphalt and shoe polish will stain if you don’t get them

off quickly. Use a clean cloth and a solvent-type vinyl cleaner.

Cleaning Leather Use a soft cloth with lukewarm water and a mild soap or saddle soap. For stubborn stains, use a mild solution of 10% isopropyl alcohol (rubbing alcohol) and 90% water. 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 finish, it can harm the leather.

Cleaning the Top of the Instrument Panel Use only mild soap and water to clean the top surfaces 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.

6-83

Care of Safety Belts Keep belts clean and dry.

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 on 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. 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. 105001 1). 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. Cleaning the Outside of Your Vehicle The paint finish on your vehicle provides beauty, depth of color, gloss retention and durability.

6-84

Washing Your Vehicle The best way to preserve your vehicle’s finish is to keep 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 contain acid or abrasives. All cleaning agents should be flushed promptly and not allowed 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.

it clean by washing

to dry on

Finish Care Occasional waxing or mild polishing of your vehicle 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 “basecoatklearcoat” 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 basecoatlclearcoat paint finish.

I NOTICE:

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

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.

6-85

Aluminum Wheels (If So Equipped) Your aluminum wheels have a protective coating similar to the painted surface of your vehicle. Don’t use strong soaps, chemicals, chrome polish, abrasive cleaners or abrasive cleaning brushes on them because you could damage this coating. After rinsing thoroughly, a wax may be applied.

NOTICE: If you have aluminum wheels, don’t use an automatic vehicle wash that has hard silicon carbide cleaning brushes. These brushes can take off the protective coating.

White Side wall Tires Your GM dealer has a GM White Sidewall Tire Cleaner. You can use a stiff brush with the cleaner. 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 & Lubricants” in the Index.) 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. Foreign Material Calcium chloride and other salts, ice melting agents, road oil and tar, tree sap, bird droppings, chemicals from industrial chimneys, and other foreign matter can damage your vehicle’s finish if they remain on painted surfaces. Use cleaners that are marked safe for painted surfaces to remove foreign matter. 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.

6-86

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, tlush 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 fall upon and attack painted surfaces 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 comes 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. Appearance Care Materials Chart PART NO. 1050172

USAGE Tar and Road Oil Removes old Remover

16 oz. (0.473L)

PRODUCT

SIZE

I050 173

16 oz. (0.473L)

1050174

I6 oz. (0.473L)

1050214

32 oz. (0.946L)

Chrome Cleaner and Polish

White Sidewall Tire Cleaner Vinyl Leather Cleaner

1050244

16 oz. (0.473L)

Fabric Cleaner

6-87

waxes, polishes, tar and road oil Removes rust and corrosion on chrome and stainless steel Cleans white and black tires Spot and stain removal on leather or vinyl Spot and stain removal on cloth and fabric

PART NO. I050427

SIZE

23 oz. (0.680L)

PRODUCT Glass Cleaner

1050429

6 lbs. (2.72 kg)

Multi-Purpose Powder Cleaner

I050729

8 oz. (0.237L)

Vinyl Top Cleaner

1051055 1051398

16 02. (0.473L) 8 oz. (0.237L)

Preservatone Spot Lifter

1052870

16 oz. (0.473L)

105020 1

16 oz. (0.473L)

Wash-Wax (conc.) Magic Mirror Cleaner-Polish

tires

USAGE Glass cleaning and spot cleaning on vinyls Cleans vinyl and cloth on door trim, seats, and carpet-also and mats. Cleaning of vinyl tops Vinyl top dressing Spot and stain removal on cloth and fabric Exterior wash

Exterior cleaner and polish

Vehicle Identification Number (VIN)

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.

6-88

Engine Identification The eighth character in your VIN is the engine code. This code will help 'ou identify your engine, specifications, and replacement parts.

4- '

6-89

Service Parts 1dent;fkation Label You’ll find this label on the inside of the glove box.

VEHICLE < M)ooooMN)~ooooo

IDENTIFICATION NUMBER

WHEELBASE

Service Ports identification

6BJ 62L 62U 67D 671 679 7BJ BHJ 9HJ c

. DO NOT REMOVE OW00 E6E E92 FLT GU1 JM7

ARL ~ 0 2 ~ 6 5 ~ 6 y K19 K64

%oooo B ~ A B9K C60 018 D35 E52

LC3 MX1 M31 NA5 NE1 QMXVK3 Vc2 VY1 VY4 V73

J- MODELDESIGNATION

OPTIONCONTENT

‘f19

PAINTTECHNOLOGY

EXTERIOR COLORS

ORDER

NUMBER

It’s very helpful if you ever need to order parts. On this label is:

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. Add-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.

6-90

Specification Charts 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. Engine Identification - Gas Engines Engine Type VIN Code Fuel System Produced By Emissions

4.3L V6 TBI? U.S.

5.0L V8 TB I?

U.S., CAN.

LD*/HD**

LD

"Light Duty Emissions with 8500 GVWR and below or: **Heavy Duty Emissions with 8501 GVWR and above ?Throttle Body Injection Engine Identification - Gas Engines (cont.) Engine Type VIN Code Fuel System Produced By Emissions

U.S., CAN. LD4:/HD**

5.7L V8

TB I?

*Light Duty Emissions with 8500 GVWR and below or: *:kHeavy Duty Emissions with 8501 GVWR and above ?Throttle Body Injection

6-91

6.5L V8

Engine ldenfificafion - Diesel Engines Engine Type VIN Code Fuel System Produced By Emissions Wheel Nut Torque

Diesel U.S. LD

6.5L V8

us. LD

Turbo Diesel

6.5L V8

Turbo Diesel

U.S. HD

MODEL

C 1500 K 1500 & C-K 2500 C-K 2500 (w/C6P) C-K 3500-Single Rear Wheels C3500-Dual Rear Wheels C3500 HD-Front C3500 HD-Rear Cooling System Capacity

DESCRIPTION 5 bolts (I41nm) 6 bolts (14mm) 8 bolts ( I4mm) 8 bolts (14mm)

8 bolts (14mm) 5 bolts (5/8 in.) 10 bolts (5/8 in.)

TORQUE

120 ft. Ibs. (160 Nom) 120 ft. lbs. ( 160 Nom) 120 ft. lbs. (160 Nom) 120 ft. lbs. (1 60 Nom)

140 ft. Ibs. (190 Nom) 175 ft. lbs. (240 Nom) 175 ft. Ibs. (240 Nom)

ENGINE

VIN QTY Without A/C*

QTY With AlC*

4.3L 5 .OL 5.7L

5.7L w/3500

HD 6.5L 6.5L 6.5L 7.4L

7.4L w/3500

HD

10.9 Quarts (10.3 Liters) 10.9 Quarts (10.3 Liters) 17.5 Quarts (16.5 Liters) 18 Quarts (17 Liters) 17.5 Quarts (16.5 Liters) 18 Quarts (17 Liters)

K 26.5 Quarts (25 Liters)

27 Quarts (25.5 Liters)

25 Quarts (23.5 Liters) 25 Quarts (23.5 Liters) 26.5 Quarts (25 Liters) 23 Quarts (22 Liters) 26.5 Quarts (25 Liters)

25 Quarts (23.5 Liters) 25 Quarts (23.5 Liters) 26.5 Quarts (25 Liters) 25 Quarts (23.5 Liters) 28.5 Quarts (27 Liters)

After refill, the level MUST be checked as outlined under “Engine Cooling System” in Section 5. *All quantities are approximate.

6-92

Crankcase Capacity ENGINE

VIN QTY Without Filter*

4.3L 5 .OL 5.7L** 6.5L 6.5L 6.5L 7 . a * *

P t st H-

4 Quarts (3.8 Liters) 4 Quarts (3.8 Liters)

4 Quarts (3.8 Liters) 6 Quarts (5.7 Liters)

QTY With Filter* 4.5 Quarts (4.3 Liters) 5 Quarts (4.8 Liters) 5 Quarts (4.8 Liters) 7 Quarts (6.5 Liters) 7 Quarts (6.5 Liters) 7 Quarts (6.5 Liters) 7 Quarts (6.5 Liters)

After refill, the level MUST be checked as outlined under “Engine Oil And Filter Recommendations’’ in Section 5. *All quantities are approximate. **Add one additional quart for C3500 HD Models. ?Oil filter should be changed at EVERY oil change.

Fuel Tank Capacity TYPE GasolineDiesel

with Short Bed with Long Bed

Crew Cab Standard

Chassis-Cab Models

Standard (Side Tank) Optional (Rear Tank)

3500 HD Models

Standard (Side Tank) Optional (Rear Tank)

QUANTITY

26 Gallons (98 Liters) 34 Gallons (128 Liters)

34 Gallons (128 Liters)

23 Gallons (87 Liters) 3 1 Gallons (1 17 Liters)

23 Gallons (87 Liters) 3 1 Gallons (1 17 Liters)

All quantities are for a completely dry tank and are approximate.

6-93

5.OL

4.3L PF52

Service Replacement Part and Filter Recommendations - Gas Engines Engine VIN Oil Filter Air Cleaner Filter PCV Valve Spark Plugs* Fuel Filter Radiator Cap

PF1218T A348C cv774c .CR43TS GF48 1 RC36

A178CW. CV789C .CR43TS GF48 1 RC36

PF1218t A348C cv774c .CR43TS GF48 1 RC36

5.7L

“four Wheel Drive Vehicle -use a PF52 oil filter *Use AC copper-cored resister type spark plugs

Service Replacement Part and Filter Recommendations - Diesel Engines Engine VIN Oil Filter Air Cleaner Fuel Filter Surge Tank Cap

PF1218 A917C TP 1006 RC33

PF1218 A9 17C TP 1006 RC33

6.5L

6.5L

7.4L

PF1218 A348C cv774c .CR43TS GF48 1 RC36

6.5L F*

PF1218 A917C TP 1006 RC33

“Heavy Duty Emission Engine 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. For additional information, see your “Warranty and Owner Assistance Information” booklet. Air Conditioning Refrigerant Capacity

TYPE

Refrigerant R 134A

QTY

2.25 lbs. (1.020 kg)

6-94

Fuse Block

FUSE LEGEND

I 25 AMP I CLEAR I 30 AMP I GREEN

I GAGES I TURN/BU

I PCM1'GN

lNJA

WIPER

DRL W l

STOPlHAZ

6-95

Fuses and Circuit Breakers NAME

CIRCUITS PROTECTED

Gages

Turn-B/U EMC/Ign

Ign. A Brake AC/Htr Ctsy

Park LP

P. Lps

Stop/Haz. Wiper Radio Acc/Ign. Acc/Batt.

Crank 4WD DRL

Cruise Control, 4 WD Display Illum. Rear Window Defogger Timer, Aux. Batt. Relay Feed, Safety Belt Buzzer Timer, Cluster Ign. Feed Back-up Lamps, Turn Signals T.C.C., Air Diverter, E.S.C., E.G.R., E.C.M. Ign., R.W.A.L. Brake Switch Throttle Body Injectors R.W.A.L., Cluster-Speedo H.V.A.C. 4WD, Aux. Batt. Relay Dome Lamp, Cargo Lamp, Ctsy, and Glove Box Lps. (TR-R), Radio (Memory-Clock) Horn Relay, Horn Feed, Cigar Lighter, Park Lamps C49 SW Illum., Headlamp “On” Warning, Radio Illum., H.V.A.C. Illum. Haz. Flasher, Seat Belt Buzzer, Stop Lmps., R.W.A.L. Memory Windshield Wiper, Washer Radio Feed Pwr. Windows Door Locks, Rear Window Defogger Crank, Discreet Four Wheel Drive Daytime Running Lights

FUSE

CIRCUIT BREAKER

20 Amp

15 Amp 10 Amp

10 Amp 15 Amp 25 Amp 20 Amp

20 Amp

5 Amp

15 Amp 25 Amp 10 Amp

5 Amp 25 Amp 15 Amp

30 Amp 30 Amp

*An inline fuse is used for the underhood lamp Do not use fuses of higher amperage than those recommended above.

6-96

Lamp and Bulb Data LAMP OR BULB TRADE

NO.

HEADLAMPS 2 Headlamp System Halogen (Opt.) 4 Headlamp System (Composite)

6052

H6054 6052

9005

LAMP OR BULB EXTERIOR Fog Lamp Front Marker Lamp Front Park and Turn Lamp Rear Parking Lamp Rear Stop and Turn Lamp Backup Lamp Backup Lamp Rear Park, Stop, and Turn Lamp’” Fender Clearance Lamp Roof Marker Lamp Cargo LampICHMSL License Plate Lamp Underhood Lamp Reel Lamp

*Chassis Cab Only LAMP OR BULB INTERIOR Dome Lamps Reading Lamps Roof Console Lamps” Courtesy Lamp

POWER

RATING AT 12.8V, WATTS

55/65

35/65 55/65

65

TRADE NO.

QTY

H3 194

2357NA

3057 3057 3156 1156 1157 194 194 92 1 194 232 232

TRADE NO.

21 1-2 21 1-2 I68 I003

6-97

Heater or A/C Control Lamp Four Wheel Drive Indicator rour Wheel Drive Shift Lever Instrument Panel Compartment Lamp Ashtray Lamp Sunshade Vanity Mirror

"Crew Cab Only LAMP OR BULB INSTRUMENT PANEL Transmission Indicator (PRNDL) Daytime Running Lights Indicatory Charging System Indicator Lamp Instrument Cluster Illumination --Gage Cluster Instrument Cluster Illumination -Tachometer Cluster Headlamp Beam Indicator Directional Signal Indicator Brake Warning Indicator Safety Belt Warning Check Gages Indicator Malfunction Indicator ("Service Engine Soon") Lamp Upshift Indicator Glow Plugs Lamp*:$: Low Coolant Water in Fuel Lamp*'$ Service Throttle Soon Lamp*"

194 161 194 194 I94 74

TRADE NO.

161 74 74 I94

I94

74 74 74 74 74 74

74 74 74 74 74

6-98

Scheduled Maintenance Services

Section

for your General Motors

This section covers the maintenance required vehicle . Your vehicle needs these services to retain it’s safety. dependability. and emission control performance . A Word About Maintenance .................................. Your Vehicle and the Environment ............................. Recording Maintenance Services ............................... Scheduled Maintenance Services ...............................

7-3 7-3 7-3 7-4 Selecting Your Vehicle’s Maintenance Services . . . . . . . . . . . . . . . . . 7-4 Gasoline Engines with Light Duty Emissions -

7-6 7-8

Diesel Engines .