2001 Chevrolet Silverado Owners Manual

* The Center High-Mounted Stoplamp (CHMSL) wire is tied next to the trailer wiring harness for use with a trailer, slide-in camper or cap.

The eight-wire harness contains the following trailer circuits: D Yellow: Left Stop/Turn Signal D Dark Green: Right Stop/Turn Signal D Brown: Taillamps D White: Ground D Light Green: Back-up Lamps D Light Blue: CHMSL D Red: Battery Feed D Dark Blue: Trailer Brake A jumper harness for an electric trailer brake controller and a trailer battery feed fuse are included with this trailering package. (See “Instrument Panel Jumper Wiring Harness” later in this section.) If you need to tow a light-duty trailer with a standard four-way round pin connector, an adapter connector is available from your dealer.

Camper/Fifth-Wheel Trailer Wiring Package (If Equipped) The eight-wire camper harness is located under the front edge of the pickup box on the driver’s side of the vehicle, attached to the frame bracket. A connector will have to be added to the wiring harness which connects to the camper. The eight-wire harness contains the following camper/trailer circuits: D Yellow: Left Stop/Turn Signal D Dark Green: Right Stop/Turn Signal D Brown: Taillamps D White: Ground D Light Green: Back-up Lamps D Light Blue: Center High-Mounted

Stoplamp (CHMSL)

D Red: Battery Feed D Dark Blue: Trailer Brake A jumper harness for an electric trailer brake controller and a trailer battery feed fuse are included with this trailering package. (See “Instrument Panel Jumper Wiring Harness” later in this section.)

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Instrument Panel Jumper Wiring Harness

If your vehicle is equipped with the “Heavy-Duty Trailering” option, please refer to “Heavy-Duty Trailer Wiring Package”, earlier in this section. When the camper-wiring harness is ordered without the heavy-duty trailering package, an eight-wire harness with a seven-pin connector and separate CHMSL connector are located at the rear of the vehicle and are tied to the vehicle’s frame.

This harness is included with the heavy-duty and camper/fifth-wheel trailer wiring packages. The harness is for an electric trailer brake controller and includes a trailer battery feed fuse. This harness and fuse should be installed by your dealer or a qualified service center.

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Auxiliary Battery (If Equipped) The auxiliary battery provision can be used to supply electrical power to additional equipment that you may choose to add, such as a slide-in camper.

If your vehicle has this provision, this relay will be located on the passenger’s side of the vehicle, next to the auxiliary battery.

When using this provision, connection should only be made to the upper stud (A) of the relay. Do not make connections to the lower stud (B) of the relay. The auxiliary battery circuit is protected by a megafuse located behind the auxiliary battery. Be sure to follow the proper installation instructions that are included with any electrical equipment that you install.

NOTICE:

When using the auxiliary battery provision, the electrical load must not exceed 30 amps. Always turn off any electrical equipment when not in use. Leaving electrical equipment on for extended periods will drain your battery.

Power Winches If you wish to use a power winch on your vehicle, only use it when your vehicle is stationary or anchored.

NOTICE:

Using a power winch with the transmission in gear may damage the transmission. When operating a power winch, always leave the transmission in NEUTRAL (N).

Use the regular brakes, set the parking brake, or block the wheels to keep your vehicle from rolling.

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Power Take-Off (PTO) (If Equipped)

NOTICE:

If you have a PTO that will exceed 35 hp installed on your vehicle, it could damage the transfer case or transmission. When having a PTO installed on your vehicle, make sure that it will not exceed 35 hp.

Before using a PTO, refer to the manufacturer’s or installer’s instructions.

NOTICE:

Using a PTO while operating in one place before the vehicle has reached normal operating temperature can damage the transfer case or transmission. If you will be using the PTO while operating in one place, drive and warm up the vehicle before using the PTO.

To engage a PTO on a vehicle with a manual transmission: 1. Hold the clutch pedal down. 2. Set the parking brake. 3. Shift the transmission into NEUTRAL (N). 4. Engage the PTO. Refer to the manufacturer’s

or installer’s for instructions on electrically engaged PTOs.

5. For mobile operations, shift the transmission into

the gear you want, apply the regular brakes and release the parking brake. For stationary operations, leave the parking brake applied.

6. Release the clutch and regular brakes as you

normally would. When the clutch is released, the PTO will start.

7. Turn the PTO rotary switch to ON. To engage a PTO on a vehicle with an automatic transmission: 1. Engine speed must be less than 1000 rpm. 2. Turn the PTO rotary switch ON.

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Using PTO speed control in Preset Mode (Factory Setting): 1. Engage the PTO. 2. Select PARK (P) or NEUTRAL (N) range.

Apply the parking brake in NEUTRAL (N) is selected. Torque Converter Clutch (TCC) lockup is not available in NEUTRAL (N) and is available only in PARK when engine speed is above 1100 rpm.

3. Make sure your foot is off the brake pedal

(and off the clutch on vehicles equipped with a manual transmission). Select the desired engine speed for PTO operation. Please read the following Preset Mode information regarding operation. Preset Mode: PTO speed control mode is used for stationary applications. This mode provides a default standby speed of 800 or 850 rpm (depending on the engine/transmission combination) and two default PTO control speeds which follow: D PTO Fast Idle Speed of 1250 rpm, or D PTO Fast Idle Resume Speed of 1700 rpm. Standby speed (800/850 rpm) is not to be used as a PTO control speed. Vehicles not equipped with cruise control will not have the resume speed capability.

Using PTO speed control in Variable Mode (Mobile): 1. Engage the PTO. 2. Vehicle speed must be greater than 5 mph for vehicles equipped with gasoline engines or greater than 0 mph for vehicles equipped with diesel engines.

3. Make sure your foot is off the brake pedal

(and off the clutch for vehicles equipped with a manual transmission).

4. Select the desired engine speed (with the foot pedal)

and select SET on the PTO switch or with the cruise control.

Using PTO speed control in Variable Mode (Stationary): 1. Engage the PTO. 2. Vehicle speed must be less than 5 mph for vehicles

equipped with gasoline engines or at 0 mph for vehicles equipped with diesel engines.

3. Make sure your foot is off the brake pedal

(and off the clutch for vehicles equipped with a manual transmission).

4. Select the desired engine speed (with the foot pedal)

and select SET on the PTO switch or with the cruise control.

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Step-Bumper Pad If your vehicle has a rear step bumper, it may be equipped with a rear step pad at the center of the bumper.

If you will be using the bumper to tow a trailer, you must remove the center cutout circle to install the trailer ball.

Variable Mode: PTO speed control mode can be used for both stationary and mobile applications. This mode allows PTO to be controlled in a fashion similar to how cruise control sets vehicle speed. The operator can set to an rpm (between 800 and 2200) with the cruise control feature or with the SET position on the PTO switch. The operator is then able to increase engine speed in 100 rpm increments with the resume position on the cruise control. The operator can also decrease engine speed in 100 rpm increments with either the SET position on the cruise control or the PTO switch. Vehicles not equipped with cruise control will not have the resume capability. All engine speed values listed above are factory preset values. With the exception of the TCC lockup speed (1100 rpm) and the “tap” increment (100 rpm), all of these values are programmable and can be adjusted by your GM dealer or body upfitter. If the PTO software settings do not match the settings shown here, then they may have already been altered in order to satisfy the requirements of the installed PTO system and body equipment.

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Section 5 Problems on the Road

Here you’ll find what to do about some problems that can occur on the road.

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5-2
5-3
5-8
5-8

Hazard Warning Flashers Other Warning Devices Jump Starting Towing Your Vehicle Engine Overheating (Gasoline Engine)

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5-18
5-18
5-19
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Cooling System (Gasoline Engine) Engine Fan Noise If a Tire Goes Flat Changing a Flat Tire If You’re Stuck: In Sand, Mud, Ice or Snow

5-

5-1

Hazard Warning Flashers

Press the button located at the top of the steering column all the way down to make your front and rear turn signal lamps flash on and off.

Your hazard warning flashers work no matter what position your key is in, and even if the key isn’t in. To turn off the flashers, press the button until the first click and release. When the hazard warning flashers are on, your turn signals won’t work. Other Warning Devices If you carry reflective triangles, you can use them to warn others. Set one up at the side of the road about 300 feet (100 m) behind your vehicle.

Your hazard warning flashers let you warn others. They also let police know you have a problem. Your front and rear turn signal lamps will flash on and off.

5-2

Jump Starting If your battery has run down, you may want to use another vehicle and some jumper cables to start your vehicle. But please use the following steps to do it safely.

CAUTION:

Batteries can hurt you. They can be dangerous because: D They contain acid that can burn you. D They contain gas that can explode or ignite. D They contain enough electricity to burn you. If you don’t follow these steps exactly, some or all of these things can hurt you.

NOTICE:

Ignoring these steps could result in costly damage to your vehicle that wouldn’t be covered by your warranty. The ACDelcoR battery in your vehicle has a built-in hydrometer. Do not charge, test or jump start the battery if the hydrometer looks clear or light yellow. Replace the battery when there is a clear or light yellow hydrometer and a cranking complaint. Trying to start your vehicle by pushing or pulling it won’t work, and it could damage your vehicle.

1. Check the other vehicle. It must have a 12-volt

battery with a negative ground system.

NOTICE:

If the other system isn’t a 12-volt system with a negative ground, both vehicles can be damaged.

5-3

2. Get the vehicles close enough so the jumper cables can reach, but be sure the vehicles aren’t touching each other. If they are, it could cause a ground connection you don’t want. You wouldn’t be able to start your vehicle, and the bad grounding could damage the electrical systems. To avoid the possibility of the vehicles rolling, set the parking brake firmly on both vehicles involved in the jump start procedure. Put an automatic transmission in PARK (P) or a manual transmission in NEUTRAL (N). If you have a four-wheel-drive vehicle, be sure the transfer case is not in NEUTRAL (N).

3. Turn off the ignition on both vehicles. Unplug

unnecessary accessories plugged into the cigarette lighter or accessory power outlets. Turn off all lamps that aren’t needed as well as radios. This will avoid sparks and help save both batteries. In addition, it could save your radio!

4. Open the hoods and locate the positive (+) and

negative (-) terminal locations on the other vehicle. Your vehicle has a remote positive (+) jump starting terminal and a remote negative (-) jump starting terminal. The remote positive (+) terminal is located behind a red plastic cover near the engine accessory drive bracket. To uncover the remote positive (+) terminal, open the red plastic cover. On all V8 gasoline and diesel engines, the remote negative (-) terminal is located on the engine accessory drive bracket. This is marked “GND” on V8 engines. On V6 engines, the remote negative (-) terminal is located on a tab attached to the engine accessory drive bracket where it is marked “GND”. You should always use the remote positive (+) and the remote negative (-) terminals instead of the positive (+) and negative (-) terminals on your battery.

NOTICE:

If you leave your radio on, it could be badly damaged. The repairs wouldn’t be covered by your warranty.

5-4

CAUTION:

CAUTION:

Using a match near a battery can cause battery gas to explode. People have been hurt doing this, and some have been blinded. Use a flashlight if you need more light. Be sure the battery has enough water. You don’t need to add water to the ACDelcoR battery installed in every new GM vehicle. But if a battery has filler caps, be sure the right amount of fluid is there. If it is low, add water to take care of that first. If you don’t, explosive gas could be present. Battery fluid contains acid that can burn you. Don’t get it on you. If you accidentally get it in your eyes or on your skin, flush the place with water and get medical help immediately.

Fans or other moving engine parts can injure you badly. Keep your hands away from moving parts once the engine is running.

5. Check that the jumper cables don’t have loose or

missing insulation. If they do, you could get a shock. The vehicles could be damaged too. Before you connect the cables, here are some basic things you should know. Positive (+) will go to positive (+) or a remote positive terminal if the vehicle has one. Negative (-) will go to a heavy, unpainted metal engine part or a remote negative terminal if the vehicle has one. Don’t connect positive (+) to negative (-) or you’ll get a short that would damage the battery and maybe other parts too. On vehicles equipped with dual batteries, make all battery connections to the remote positive (+) and remote negative (-) terminals.

5-5

6. Connect the red

positive (+) cable to the positive (+) terminal of the vehicle with the dead battery. Use a remote positive (+) terminal if the vehicle has one.

7. Don’t let the other end touch metal. Connect it to the positive (+) terminal of the good battery. Use a remote positive (+) terminal if the vehicle has one.

8. Now connect the black

negative (-) cable to the good battery’s negative (-) cable. Use a remote negative (-) terminal if the vehicle has one.

Don’t let the other end touch anything until the next step. The other end of the negative (-) cable doesn’t go to the dead battery. It goes to a heavy, unpainted metal part of the vehicle with the dead battery or to a remote negative (-) terminal if the vehicle has one.

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12. Remove the cables in reverse order to prevent

electrical shorting. Take care that they don’t touch each other or any other metal.

V8 Engine

V6 Engine, Diesel Similar

9. When connecting the cable, be sure it is not near

any engine parts that will move.

10. Now start the vehicle with the good battery and

run the engine for awhile.

11. Try to start the vehicle with the dead battery. If it won’t start after a few tries, it probably needs service.

Jumper Cable Removal

A. Heavy, Unpainted Metal Engine Part B. Good Battery C. Dead Battery

5-7

1. Disconnect the black negative (-) cable from the heavy, unpainted metal engine part on the vehicle that had the dead battery.

2. Disconnect the black negative (-) cable from the

negative (-) terminal on the vehicle with the good battery.

3. Disconnect the red positive (+) cable from the

vehicle with the good battery.

4. Disconnect the red positive (+) cable from the

other vehicle.

Towing Your Vehicle Consult your dealer or a professional towing service if you need to have your vehicle towed. See “Roadside Assistance” in the Index. Engine Overheating You will find a coolant temperature gage on your vehicle’s instrument panel. See “Engine Coolant Temperature Gage” in the Index. In addition, you will find a LOW COOLANT, CHECK COOLANT TEMP, ENGINE OVERHEATED and a REDUCED ENGINE POWER message in the message center on the instrument panel. See “Message Center” in the Index.

5-8

Overheated Engine Protection Operating Mode (V8 Engines Only) Should an overheated engine condition exist and the REDUCED ENGINE POWER message is displayed, an overheat protection mode which alternates firing groups of cylinders helps prevent engine damage. In this mode, you will notice a loss in power and engine performance. This operating mode allows your vehicle to be driven to a safe place in an emergency. Towing a trailer in the overheat protection mode should be avoided.

NOTICE:

After driving in the overheated engine protection operating mode, to avoid engine damage, allow the engine to cool before attempting any repair. The engine oil will be severely degraded. Repair the cause of coolant loss, change the oil and reset the oil life monitor. See “Engine Oil” in the Index.

If Steam Is Coming From Your Engine

CAUTION: (Continued)

from it. Just turn it off and get everyone away from the vehicle until it cools down. Wait until there is no sign of steam or coolant before you open the hood. If you keep driving when your engine is overheated, the liquids in it can catch fire. You or others could be badly burned. Stop your engine if it overheats, and get out of the vehicle until the engine is cool. See “Overheated Engine Protection Operating Mode” in the Index.

CAUTION:

NOTICE:

Steam from an overheated engine can burn you badly, even if you just open the hood. Stay away from the engine if you see or hear steam coming

CAUTION: (Continued)

If your engine catches fire because you keep driving with no coolant, your vehicle can be badly damaged. The costly repairs would not be covered by your warranty. See “Overheated Engine Protection Operating Mode” in the Index.

5-9

If No Steam Is Coming From Your Engine If you get an engine overheat warning but see or hear no steam, the problem may not be too serious. Sometimes the engine can get a little too hot when you: D Climb a long hill on a hot day. D Stop after high-speed driving. D Idle for long periods in traffic. D Tow a trailer. See “Driving on Grades” in the Index. If you get the overheat warning with no sign of steam, try this for a minute or so: 1. If you have an air conditioner and it’s on, turn it off. 2. Turn on your heater to full hot at the highest fan

speed and open the window as necessary.

3. If you’re in a traffic jam, shift to NEUTRAL (N);

otherwise, shift to the highest gear while driving -- DRIVE (D) for automatic transmissions.

If you no longer have the overheat warning, you can drive. Just to be safe, drive slower for about 10 minutes. If the warning doesn’t come back on, you can drive normally. If the warning continues, pull over, stop, and park your vehicle right away. If there’s still no sign of steam, push down the accelerator until the engine speed is about twice as fast as normal idle speed for at least three minutes while you’re parked. If you still have the warning, turn off the engine and get everyone out of the vehicle until it cools down. Also, see “Overheated Engine Protection Operating Mode” listed previously in this section. You may decide not to lift the hood but to get service help right away.

5-10

Cooling System (Gasoline Engine) When you decide it’s safe to lift the hood, here’s what you’ll see:

8100 V8 Engines

All Other Engines

A. Coolant Surge Tank B. Coolant Surge Tank Pressure Cap C. Engine Fan

5-11

If the coolant inside the coolant surge tank is boiling, don’t do anything else until it cools down.

CAUTION:

When the engine is cold, the coolant level should be at or above the FILL COLD mark. If it isn’t, you may have a leak in the radiator hoses, heater hoses, radiator, water pump or somewhere else in the cooling system.

Heater and radiator hoses, and other engine parts, can be very hot. Don’t touch them. If you do, you can be burned. Don’t run the engine if there is a leak. If you run the engine, it could lose all coolant. That could cause an engine fire, and you could be burned. Get any leak fixed before you drive the vehicle.

NOTICE:

Engine damage from running your engine without coolant isn’t covered by your warranty. See “Overheated Engine Protection Operating Mode” in the Index.

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NOTICE:

When adding coolant, it is important that you use only DEX-COOLR (silicate-free) coolant. If coolant other than DEX-COOL 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. Damage caused by the use of coolant other than DEX-COOLR is not covered by your new vehicle warranty.

If there seems to be no leak, start the engine again. See if the engine cooling fan speed increases when idle speed is doubled by pushing the accelerator pedal down. If it doesn’t, your vehicle needs service. Turn off the engine. How to Add Coolant to the Coolant Surge Tank --Gasoline Engines If you haven’t found a problem yet, but the coolant level isn’t at or above the FILL COLD mark, add a 50/50
mixture of clean, drinkable water and DEX-COOLR coolant at the coolant surge tank, but be sure the cooling system, including the coolant surge tank pressure cap, is cool before you do it. See “Engine Coolant” in the Index for more information.

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CAUTION:

Steam and scalding liquids from a hot cooling system can blow out and burn you badly. They are under pressure, and if you turn the coolant surge tank pressure cap -- even a little -- they can come out at high speed. Never turn the cap when the cooling system, including the coolant surge tank pressure cap, is hot. Wait for the cooling system and coolant surge tank pressure cap to cool if you ever have to turn the pressure cap.

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CAUTION:

NOTICE:

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 mixture will. Your vehicle’s coolant warning system is set for the proper coolant mixture. With plain water or the wrong mixture, 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 50/50 mixture of clean, drinkable water and DEX-COOLR coolant.

In cold weather, water can freeze and crack the engine, radiator, heater core and other parts. So use the recommended coolant.

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.

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3. Then fill the coolant surge tank with the proper

mixture, to the FILL COLD mark.

1. You can remove the coolant surge tank pressure

cap when the cooling system, including the coolant surge tank pressure cap and upper radiator hose, is no longer hot. Turn the pressure cap slowly counterclockwise (left) about one full turn. If you hear a hiss, wait for that to stop. A hiss means there is still some pressure left.

2. Then keep turning the pressure cap slowly, and

remove it.

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4. With the coolant surge tank pressure cap off, start

the engine and let it run until you can feel the upper radiator hose getting hot. Watch out for the engine cooling fan. By this time, the coolant level inside the coolant surge tank may be lower. If the level is lower, add more of the proper mixture to the coolant surge tank until the level reaches the FILL COLD mark.

5. Then replace the pressure cap. Be sure the pressure

cap is hand-tight.

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Engine Fan Noise Your vehicle has a clutched engine cooling fan. When the clutch is engaged, the fan spins faster to provide more air to cool the engine. In most everyday driving conditions, the fan is spinning slower and the clutch is not fully engaged. This improves fuel economy and reduces fan noise. Under heavy vehicle loading, trailer towing and/or high outside temperatures, the fan speed increases as the clutch more fully engages. So you may hear an increase in fan noise. This is normal and should not be mistaken as the transmission slipping or making extra shifts. It is merely the cooling system functioning properly. The fan will slow down when additional cooling is not required and the clutch disengages. You may also hear this fan noise when you start the engine. It will go away as the fan clutch partially disengages.

If a Tire Goes Flat It’s unusual for a tire to “blow out” while you’re driving, especially if you maintain your tires properly. If air goes out of a tire, it’s much more likely to leak out slowly. But if you should ever have a “blowout,” here are a few tips about what to expect and what to do: If a front tire fails, the flat tire will create a drag that pulls the vehicle toward that side. Take your foot off the accelerator pedal and grip the steering wheel firmly. Steer to maintain lane position, and then gently brake to a stop well out of the traffic lane. A rear blowout, particularly on a curve, acts much like a skid and may require the same correction you’d use in a skid. In any rear blowout, remove your foot from the accelerator pedal. Get the vehicle under control by steering the way you want the vehicle to go. It may be very bumpy and noisy, but you can still steer. Gently brake to a stop -- well off the road if possible. If a tire goes flat, the next part shows how to use your jacking equipment to change a flat tire safely.

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CAUTION: (Continued)

4. Turn off the engine. 5. Put the wheel blocks at the front and rear of the tire farthest away from the one being changed. That would be the tire on the other side of the vehicle, at the opposite end.

Changing a Flat Tire If a tire goes flat, avoid further tire and wheel damage by driving slowly to a level place. Turn on your hazard warning flashers.

CAUTION:

Changing a tire can cause an injury. The vehicle can slip off the jack and roll over you or other people. You and they could be badly injured. Find a level place to change your tire. To help prevent the vehicle from moving: 1. Set the parking brake firmly. 2. Put an automatic transmission shift lever in

PARK (P) or shift a manual transmission to FIRST (1) or REVERSE (R).

3. If you have a four-wheel-drive vehicle,

be sure the transfer case is in a drive gear -- not in NEUTRAL.

CAUTION: (Continued)

The following steps will tell you how to use the jack and change a tire.

5-19

Removing the Spare Tire and Tools

Regular Cab

Extended and Crew CabR

The equipment you’ll need is behind the passenger’s seat. For Extended and Crew Cab models, the equipment is under the passenger’s side second row seat.

5-20

1. If there is a cover, move the seats forward and

turn the wing nut on the cover counterclockwise to remove it. For Crew Cab models, pull up the second row seat with the loop at the base of the seat cushion to access the tools.

2. The wheel blocks and the wheel block retainer can be

removed by turning the wing nut counterclockwise. 3. To release the bottle jack from its holder, turn the knob on the bottle jack counterclockwise to lower the jack head slightly.

4. There is also a wing nut used to retain the

storage bag and tools. To remove it, turn the wing nut counterclockwise.

You’ll use the jack handle and the wheel wrench to remove the underbody-mounted spare tire.

A. Hoist Assembly B. Wheel Wrench C. Extensions D. Hoist Shaft E. Valve Stem,

Pointed Down

F. Spare Tire

G. Tire Retainer H. Hoist Cable I. Hoist Lock J. Hoist Shaft Access Hole

K. Hoist End

5-21

Follow these instructions to lower the spare tire: 1. If the vehicle is equipped with a hoist lock,

open the spare tire lock cover on the bumper and use the ignition key to remove the lock.

2. Assemble the wheel wrench and the two jack handle extensions as shown. Insert the hoist end (open end) of the extension through the hole in the rear bumper. Be sure the hoist end of the extension connects into the hoist shaft.

3. Turn the wheel wrench counterclockwise to lower

the spare tire to the ground. Continue to turn the wheel wrench until the spare tire can be pulled out from under the vehicle. The wheel wrench has a hook that allows you to pull the hoist cable towards you, to assist in reaching the spare tire.

4. When the tire has been lowered, tilt the retainer at the end of the cable so it can be pulled up through the wheel opening.

5. Put the spare tire near the flat tire.

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The tools you’ll be using include the bottle jack (A), the wheel blocks (B), the jack handle (C), the jack handle extensions (D), and the wheel wrench (E). If the flat tire is on the rear of the vehicle, you’ll need to use both jack handle extensions.

Attach the wheel wrench to the jack handle extensions (as needed). Attach the jack handle to the jack.

Turn the wheel wrench clockwise to raise the jack lift head a little.

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If your vehicle has wheel nut caps, loosen them by turning the wheel wrench counterclockwise. If you have a center cap with wheel nut caps, the wheel nut caps are designed to remain with the center cap.

Removing the Flat Tire and Installing the Spare Tire

1. Use the wheel wrench

to loosen all the wheel nuts. Turn the wheel wrench counterclockwise to loosen the wheel nuts. Don’t remove the wheel nuts yet.

Remove the center cap. If the wheel has a smooth center piece, place the chisel end of the wheel wrench in the slot on the wheel and gently pry out.

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2. Position the jack under the vehicle. If the flat tire

is on the front of the vehicle (2-Wheel Drive 1500 Series vehicles), position the jack under the bracket attached to the vehicle’s frame, behind the flat tire. If the flat tire is on the front of the vehicle (all other models), position the jack on the frame behind the flat tire. If the flat tire is on the rear, position the jack under the rear axle between the spring anchor and the shock absorber bracket. If you have added a snow plow to the front of your vehicle, lower the snow plow fully before raising the vehicle.

CAUTION:

Getting under a vehicle when it is jacked up is dangerous. If the vehicle slips off the jack, you could be badly injured or killed. Never get under a vehicle when it is supported only by a jack.

CAUTION:

Raising your vehicle with the jack improperly positioned can damage the vehicle and even make the vehicle fall. To help avoid personal injury and vehicle damage, be sure to fit the jack lift head into the proper location before raising the vehicle.

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Front Position 2WD 1500 Series

Front Position All Other Models

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Rear Position

3. Make sure the jack head is positioned so that the rear axle is resting securely between the grooves that are on the jack head. Turn the wheel wrench clockwise to raise the vehicle. Raise the vehicle far enough off the ground so there is enough room for the spare tire to fit under the wheel well.

4. Remove all the wheel nuts and take off the flat tire.

5. Remove any rust or dirt

from the wheel bolts, mounting surfaces and spare wheel.

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CAUTION:

CAUTION:

Rust or dirt on the wheel, or on the parts to which it is fastened, can make the 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 the 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.

Never use oil or grease on studs or nuts. If you do, the nuts might come loose. Your wheel could fall off, causing a serious accident.

6. After mounting the

spare, replace the wheel nuts with the rounded end of the nuts toward the wheel. Tighten each wheel nut by hand using the wheel wrench until the wheel is held against the hub.

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Front Position 2WD 1500 Series

Front Position All Other Models

5-29

Rear Position

7. Turn the wheel wrench counterclockwise to lower

the vehicle. Lower the jack completely.

8. Tighten the nuts firmly in a crisscross sequence as

shown by turning the wheel wrench clockwise.

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CAUTION:

NOTICE:

Incorrect wheel nuts or improperly tightened wheel nuts can cause the wheel to become loose and even come off. This could lead to an accident. Be sure to use the correct wheel nuts. If you have to replace them, be sure to get new GM original equipment wheel nuts. Stop somewhere as soon as you can and have the nuts tightened with a torque wrench to the proper torque. See “Capacities and Specifications” in the Index.

Improperly tightened wheel nuts can lead to brake pulsation and rotor damage. To avoid expensive brake repairs, evenly tighten the wheel nuts in the proper sequence and to the proper torque specification.

Storing a Flat or Spare Tire and Tools

CAUTION:

Storing a jack, a tire or other equipment in the passenger compartment of the vehicle could cause injury. In a sudden stop or collision, loose equipment could strike someone. Store all these in the proper place.

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Return the bottle jack, wheel blocks, wheel wrench and jack extensions to their location behind the passenger’s seat. Secure the items in the vehicle as shown.

Store the tire under the rear of the vehicle in the spare tire carrier. To store the tire, do the following: 1. Put the tire on the ground at the rear of the

vehicle with the valve stem pointed downward and to the rear.

2. Tilt the retainer downward and through the wheel opening. Make sure that the retainer is fully seated across the underside of the wheel.

3. Attach the wheel wrench and extensions together.

Insert the hoist end through the hole in the rear bumper and into the hoist shaft.

4. Raise the tire part of the way upward. When the tire is almost in the stored position, adjust the tire so that the valve stem is toward the rear of the vehicle.

A. Wing Nut B. Wheel Blocks C. Wheel Wrench and Extensions Retainer

D. Gloves

E. Wheel Wrench and Extensions

F. Storage Bag G. Bottle Jack Holder H. Bottle Jack I. Wheel Block

Retainer

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A. Hoist Assembly B. Wheel Wrench C. Extensions D. Hoist Shaft

E. Valve Stem,

Pointed Down

F. Flat or Spare Tire G. Retainer H. Hoist Cable

5. Raise the tire fully against the underside of the

vehicle. Continue turning the wheel wrench until the tire is secure and the cable is tight. The spare tire hoist cannot be overtightened.

6. Make sure the tire is stored securely. Push, pull, and

then try to rotate or turn the tire. If the tire moves, use the wheel wrench/hoist shaft to tighten the cable.

Replace the jack, tools and spare tire lock.

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If You’re Stuck: In Sand, Mud, Ice or Snow In order to free your vehicle when it is stuck, you will need to spin the wheels, but you don’t want to spin your wheels too fast. The method known as “rocking” can help you get out when you’re stuck, but you must use caution.

NOTICE:

Spinning your wheels can destroy parts of your vehicle as well as the tires. If you spin the wheels too fast while shifting your transmission back and forth, you can destroy your transmission.

CAUTION:

For information about using tire chains on your vehicle, see “Tire Chains” in the Index.

If you let your tires spin at high speed, they can explode, and you or others could be injured. And, the transmission or other parts of the vehicle can overheat. That could cause an engine compartment fire or other damage. When you’re stuck, spin the wheels as little as possible. Don’t spin the wheels above 35 mph (55 km/h) as shown on the speedometer.

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Using the Recovery Hooks

Rocking Your Vehicle To Get It Out First, turn your steering wheel left and right. That will clear the area around your front wheels. If you have a four-wheel drive vehicle, shift into 4HI. If your vehicle has the Traction Assist System, you should turn it off by pressing the TAS on/off button. Then shift back and forth between REVERSE (R) and a forward gear (or with a manual transmission, between FIRST (1) or SECOND (2) and REVERSE (R)), spinning the wheels as little as possible. Release the accelerator pedal while you shift, and press lightly on the accelerator pedal when the transmission is in gear. By slowly spinning your wheels in the forward and reverse directions, you will cause a rocking motion that may free your vehicle. If that doesn’t get you out after a few tries, you may need to be towed out. Or, you can use your recovery hooks if your vehicle has them. If you do need to be towed out, see “Towing Your Vehicle” in the Index.

Your vehicle may be equipped with recovery hooks. The recovery hooks are provided at the front of your vehicle. You may need to use them if you’re stuck off-road and need to be pulled to some place where you can continue driving.

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CAUTION:

The recovery hooks, when used, are under a lot of force. Always pull the vehicle straight out. Never pull on the hooks at a sideways angle. The hooks could break off and you or others could be injured from the chain or cable snapping back.

NOTICE:

Never use the recovery hooks to tow the vehicle. Your vehicle could be damaged and it would not be covered by warranty.

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Section 6 Service and Appearance Care

Here you will find information about the care of your vehicle. This section begins with service and fuel information, and then it shows how to check important fluid and lubricant levels. There is also technical information about your vehicle, and a part devoted to its appearance care.

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Service Fuel Fuels in Foreign Countries Filling Your Tank Checking Things Under the Hood Noise Control System Engine Oil Engine Air Cleaner/Filter Passenger Compartment Air Filter (If Equipped) Automatic Transmission Fluid (Except Allison Transmission) Automatic Transmission Fluid (AllisonR Only) Manual Transmission Fluid Hydraulic Clutch Rear Axle Four-Wheel Drive

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Engine Coolant Coolant Surge Tank Pressure Cap Power Steering Fluid Windshield Washer Fluid Brakes Battery Bulb Replacement Windshield Wiper Blade Replacement Tires Appearance Care Cleaning the Inside of Your Vehicle Cleaning the Outside of Your Vehicle GM Vehicle Care/Appearance Materials Vehicle Identification Number (VIN) Electrical System Replacement Bulbs Capacities and Specifications

6-1

Service Your dealer knows your vehicle best and wants you to be happy with it. We hope you’ll go to your dealer for all your service needs. You’ll get genuine GM parts and GM-trained and supported service people. We hope you’ll want to keep your GM vehicle all GM. Genuine GM parts have one of these marks:

Doing Your Own Service Work If you want to do some of your own service work, you’ll want to use the proper service manual. It tells you much more about how to service your vehicle than this manual can. To order the proper service manual, see “Service and Owner Publications” in the Index. Your vehicle has an air bag system. Before attempting to do your own service work, see “Servicing Your Air Bag-Equipped Vehicle” in the Index. Your vehicle may have an air bag system. If it does, see “Servicing Your Air Bag-Equipped Vehicle” in the Index before attempting to do your own service work. You should keep a record with all parts receipts and list the mileage and the date of any service work you perform. See “Maintenance Record” in the Index.

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CAUTION:

You can be injured and your vehicle could be damaged if you try to do service work on a vehicle without knowing enough about it. D Be sure you have sufficient knowledge,

experience, the proper replacement parts and tools before you attempt any vehicle maintenance task.

D Be sure to use the proper nuts, bolts and other fasteners. “English” and “metric” fasteners can be easily confused. If you use the wrong fasteners, parts can later break or fall off. You could be hurt.

Adding Equipment to the Outside of Your Vehicle Things you might add to the outside of your vehicle can affect the airflow around it. This may cause wind noise and affect windshield washer performance. Check with your dealer before adding equipment to the outside of your vehicle.

Fuel Use regular unleaded gasoline rated at 87 octane or higher. It is recommended that the gasoline meet specifications which were developed by the American Automobile Manufacturers Association (AAMA) and endorsed by the Canadian Motor Vehicle Manufacturers Association for better vehicle performance and engine protection. Gasolines meeting the AAMA specification could provide improved driveability and emission control system performance compared to other gasolines.

6-3

In Canada, look for the “Auto Makers’ Choice” label on the fuel pump.

Canada Only

Be sure the posted octane is at least 87. If the octane is less than 87, you may get a heavy knocking noise when you drive. If it’s bad enough, it can damage your engine. If you’re using fuel rated at 87 octane or higher and you hear heavy knocking, your engine needs service. But don’t worry if you hear a little pinging noise when you’re accelerating or driving up a hill. That’s normal, and you don’t have to buy a higher octane fuel to get rid of pinging. It’s the heavy, constant knock that means you have a problem.

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If your vehicle is certified to meet California Emission Standards (indicated on the underhood emission control label), it is designed to operate on fuels that meet California specifications. If such fuels are not available in states adopting California emissions standards, your vehicle will operate satisfactorily on fuels meeting federal specifications, but emission control system performance may be affected. The malfunction indicator lamp on your instrument panel may turn on and/or your vehicle may fail a smog-check test. See “Malfunction Indicator Lamp” in the Index. If this occurs, return to your authorized GM dealer for diagnosis to determine the cause of failure. In the event it is determined that the cause of the condition is the type of fuels used, repairs may not be covered by your warranty. Some gasolines that are not reformulated for low emissions may contain an octane-enhancing additive called methylcyclopentadienyl manganese tricarbonyl (MMT); ask your service station operator whether or not the fuel contains MMT. General Motors does not recommend the use of such gasolines. If fuels containing MMT are used, spark plug life may be reduced and your emission control system performance may be affected. The malfunction indicator lamp on your instrument panel may turn on. If this occurs, return to your authorized GM dealer for service.

To provide cleaner air, all gasolines in the United States are now required to contain additives that will help prevent deposits from forming in your engine and fuel system, allowing your emission control system to function properly. Therefore, you should not have to add anything to the fuel. In addition, gasolines containing oxygenates, such as ethers and ethanol, and reformulated gasolines may be available in your area to contribute to clean air. General Motors recommends that you use these gasolines, particularly if they comply with the specifications described earlier.

Fuels in Foreign Countries If you plan on driving in another country outside the United States or Canada, the proper fuel may be hard to find. Never use leaded gasoline or any other fuel not recommended in the previous text on fuel. Costly repairs caused by use of improper fuel wouldn’t be covered by your warranty. To check on fuel availability, ask an auto club, or contact a major oil company that does business in the country where you’ll be driving.

NOTICE:

Your vehicle was not designed for fuel that contains methanol. Don’t use it. It can corrode metal parts in your fuel system and also damage plastic and rubber parts. That damage wouldn’t be covered under your warranty.

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Filling Your Tank

CAUTION:

Gasoline vapor is highly flammable. It burns violently, and that can cause very bad injuries. Don’t smoke if you’re near gasoline or refueling your vehicle. Keep sparks, flames and smoking materials away from gasoline.

If your vehicle has a diesel engine, see “Filling Your Tank (Diesel Engine)” in the Diesel Engine Supplement.

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The fuel cap is located behind a hinged door on the driver’s side of the vehicle. If your vehicle is a chassis cab, you will have a second fuel cap. While refueling, hang the filler cap by the tether using the hook located on the inside of the filler door. To remove the cap, turn it slowly to the left (counterclockwise).

CAUTION:

If you get gasoline on yourself and then something ignites it, you could be badly burned. Gasoline can spray out on you if you open the fuel filler cap too quickly. This spray can happen if your tank is nearly full, and is more likely in hot weather. Open the fuel filler cap slowly and wait for any “hiss” noise to stop. Then unscrew the cap all the way.

Be careful not to spill gasoline. Clean gasoline from painted surfaces as soon as possible. See “Cleaning the Outside of Your Vehicle” in the Index.

When you put the cap back on, turn it to the right (clockwise) until you hear a clicking sound. Make sure you fully install the cap. The diagnostic system can determine if the fuel cap has been left off or improperly installed. This would allow fuel to evaporate into the atmosphere. See “Malfunction Indicator Lamp” in the Index.

NOTICE:

If you need a new cap, be sure to get the right type. Your dealer can get one for you. If you get the wrong type, it may not fit properly. This may cause your malfunction indicator lamp to light and your fuel tank and emissions system may be damaged. See “Malfunction Indicator Lamp” in the Index.

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Filling a Portable Fuel Container

Checking Things Under the Hood

CAUTION:

CAUTION:

Things that burn can get on hot engine parts and start a fire. These include liquids like fuel, oil, coolant, brake fluid, windshield washer and other fluids, and plastic or rubber. You or others could be burned. Be careful not to drop or spill things that will burn onto a hot engine.

Never fill a portable fuel container while it is in your vehicle. Static electricity discharge from the container can ignite the gasoline vapor. You can be badly burned and your vehicle damaged if this occurs. To help avoid injury to you and others: D Dispense gasoline only into

approved containers.

D Do not fill a container while it is inside a

vehicle, in a vehicle’s trunk, pickup bed or on any surface other than the ground. D Bring the fill nozzle in contact with the

inside of the fill opening before operating the nozzle. Contact should be maintained until the filling is complete.

D Don’t smoke while pumping gasoline.

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Hood Release

1. To open the hood, first pull the handle located inside the vehicle to the lower left of the steering wheel.

2. Then go to the front of the vehicle and pull up on the

secondary hood release, located on the passenger’s side near the center of the grille.

3. Lift the hood. 4. Before closing the hood, be sure all filler caps are on

properly. Pull down the hood and close it firmly.

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Engine Compartment Overview When you lift up the hood on the VORTEC 4300 V6 engine, you’ll see the following:

A. Engine Air Cleaner/Filter B. Coolant Surge Tank C. Air Filter Restriction Indicator D. Engine Oil Dipstick E. Automatic Transmission Dipstick

(If Equipped)

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F. Fan G. Engine Oil Fill H. Power Steering Fluid Reservoir I. Remote Negative (-)

Terminal (GND)

J. Remote Positive (+) Terminal

K. Brake Fluid Reservoir L. Clutch Fluid Reservoir

(If Equipped)

M. Underhood Electrical Center N. Battery O. Windshield Washer Fluid Reservoir

When you lift up the hood on the VORTEC 5300 V8 engine (VORTEC 4800 and 6000 V8 engines similar), you will see the following:

A. Engine Air Cleaner/Filter B. Coolant Surge Tank C. Air Filter Restriction Indicator D. Engine Oil Dipstick E. Automatic Transmission Dipstick

(If Equipped)

F. Engine Oil Fill G. Fan H. Remote Negative (-)

Terminal (GND)

I. Power Steering Fluid Reservoir J. Remote Positive (+) Terminal

K. Brake Fluid Reservoir L. Clutch Fluid Reservoir

(If Equipped)

M. Underhood Electrical Center N. Battery O. Windshield Washer Fluid Reservoir

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When you lift up the hood on the VORTEC 8100 V8 engine you will see the following:

A. Engine Air Cleaner/Filter B. Coolant Surge Tank C. Air Filter Restriction Indicator D. Engine Oil Dipstick E. Automatic Transmission Dipstick

(If Equipped)

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F. Engine Oil Fill G. Fan H. Remote Negative (-)

Terminal (GND)

I. Remote Positive (+) Terminal J. Power Steering Fluid Reservoir

K. Brake Fluid Reservoir L. Clutch Fluid Reservoir

(If Equipped)

M. Underhood Electrical Center N. Battery O. Windshield Washer Fluid Reservoir

Noise Control System The following information relates to compliance with federal noise emission standards for vehicles with a Gross Vehicle Weight Rating (GVWR) of more than 10,000 lbs. (4 536 kg). The Maintenance Schedule provides information on maintaining the noise control system to minimize degradation of the noise emission control system during the life of your vehicle. The noise control system warranty is given in your warranty booklet. These standards apply only to vehicles sold in the United States. Tampering With Noise Control System Prohibited Federal law prohibits the following acts or the causing thereof: 1. The removal or rendering inoperative by any person,

other than for purposes of maintenance, repair or replacement, of any device or element of design incorporated into any new vehicle for the purpose of noise control, prior to its sale or delivery to the ultimate purchaser or while it is in use; or

2. The use of the vehicle after such device or element of design has been removed or rendered inoperative by any person.

Among those acts presumed to constitute tampering are the acts listed below. Insulation: D Removal of the noise shields or any

underhood insulation.

Engine: D Removal or rendering engine speed governor (if equipped) inoperative so as to allow engine speed to exceed manufacturer specifications.

Fan and Drive: D Removal of fan clutch (if equipped) or rendering

clutch inoperative.

D Removal of the fan shroud (if equipped). Air Intake: D Removal of the air cleaner silencer. D Reversing the air cleaner cover. Exhaust: D Removal of the muffler and/or resonator. D Removal of the exhaust pipes and exhaust

pipe clamps.

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Engine Oil

If the CHECK ENG OIL LEVEL light appears on the instrument panel, it means you need to check your engine oil level right away.

For more information, see CHECK ENG OIL LEVEL in the Index. You should check your engine oil level regularly; this is an added reminder. Checking Engine Oil It’s a good idea to check your engine oil every time you get fuel. In order to get an accurate reading, the oil must be warm and the vehicle must be on level ground.

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All Other Engines

8100 V8 Engine

The engine oil dipstick has a yellow ring handle and is located on the passenger’s side of the engine. See “Engine Compartment Overview” in the Index for more information. Turn off the engine and give the oil several minutes to drain back into the oil pan. If you don’t, the oil dipstick might not show the actual level. Pull out the dipstick and clean it with a paper towel or cloth, then push it back in all the way. Remove it again, keeping the tip down, and check the level.

When to Add Engine Oil If the oil is at or below the then you’ll need to add at least one quart of oil. But you must use the right kind. This part explains what kind of oil to use. For crankcase capacity, see “Capacities and Specifications” in the Index.

NOTICE:

Don’t add too much oil. If your engine has so much oil that the oil level gets above the cross-hatched area that shows the proper operating range, your engine could be damaged.

All Other Engines

8100 V8 Engine

The engine oil fill cap for the VORTEC 4800, 5300 and 6000 V8 engines is located on the driver’s side engine valve cover. On the 8100 engine, the oil fill cap is located on the driver’s side engine valve cover. See “Engine Compartment Overview” in the Index for more information on location. Be sure to fill it enough to put the level somewhere in the proper operating range. Push the dipstick all the way back in when you’re through.

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What Kind of Engine Oil to Use Oils recommended for your vehicle can be identified by looking for the starburst symbol. This symbol indicates that the oil has been certified by the American Petroleum Institute (API). Do not use any oil which does not carry this starburst symbol.

If you change your own oil, be sure you use oil that has the starburst symbol on the front of the oil container. If you have your oil changed for you, be sure the oil put into your engine is American Petroleum Institute certified for gasoline engines.

You should also use the proper viscosity oil for your vehicle, as shown in the following chart:

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As in the chart shown previously, SAE 5W-30 is best for your vehicle. However, you can use SAE 10W-30 if it’s going to be 0_F (-18_C) or above. These numbers on an oil container show its viscosity, or thickness. Do not use other viscosity oils, such as SAE 20W-50.

NOTICE:

Use only engine oil with the American Petroleum Institute Certified For Gasoline Engines starburst symbol. Failure to use the recommended oil can result in engine damage not covered by your warranty.

GM GoodwrenchR oil meets all the requirements for your vehicle. If you are in an area where the temperature falls below -20_F (-29_C), consider using either an SAE 5W-30
synthetic oil or an SAE 0W-30 oil. Both will provide easier cold starting and better protection for your engine at extremely low temperatures.

Engine Oil Additives Don’t add anything to your oil. The recommended oils with the starburst symbol are all you will need for good performance and engine protection. When to Change Engine Oil Your vehicle has a computer that lets you know when to change your engine oil. This is not based on mileage, but on engine revolutions and engine operating temperature. When the computer has calculated that the oil needs changing, the GM Oil Life Systemt will indicate that a change is necessary. The mileage between oil and filter changes will vary depending on how you drive your vehicle -- usually between 3,000 miles (5 000 km) and 10,000 miles (16 000 km) since your last oil and filter change. Under severe conditions, the system may come on before 3,000 miles (5 000 km). Never drive your vehicle more than 10,000 miles (16 000 km) or 12 months (whichever occurs first) without an oil change. The system won’t detect dust in the oil. So, if you drive in a dusty area, be sure to change your oil and filter every 3,000 miles (5 000 km) or sooner. Remember to reset the CHANGE ENGINE OIL light whenever the oil is changed.

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How to Reset the CHANGE ENGINE OIL Message To reset the CHANGE ENGINE OIL message, turn the ignition key to RUN with the engine off. Fully press and release the accelerator pedal three times within five seconds. If the CHANGE ENGINE OIL message flashes for five seconds, the system is reset. What to Do with Used Oil Did you know that used engine oil contains certain elements that may be unhealthy for your skin and could even cause cancer? Don’t let used oil stay on your skin for very long. Clean your skin and nails with soap and water, or a good hand cleaner. Wash or properly throw away clothing or rags containing used engine oil. See the manufacturer’s warnings about the use and disposal of oil products. Used oil can be a real threat to the environment. If you change your own oil, be sure to drain all free-flowing oil from the filter before disposal. Don’t ever dispose of oil by putting it in the trash, pouring it on the ground, into sewers, or into streams or bodies of water. Instead, recycle it by taking it to a place that collects used oil. If you have a problem properly disposing of your used oil, ask your dealer, a service station or a local recycling center for help.

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Engine Air Cleaner/Filter

The air cleaner assembly has an indicator that lets you know when the air filter is dirty and needs to be serviced. The indicator is located on the air cleaner cover.

See “Owner Checks and Services” in the Index to determine when to check the indicator. If the area inside the clear section of the indicator is not completely yellow, no air filter service is required. When the area inside the indicator is completely yellow, past the red band, the words “CHANGE FILTER” will be highlighted. After changing the air filter, press the top button on the indicator to reset it.

Your air cleaner is located in the passenger’s side front corner of the engine compartment. See “Engine Compartment Overview” in the Index for more information on location.

1. To remove the air filter, loosen the screws on the

cover. Lift the cover upward. Lift the filter from the air cleaner housing. Care should be taken to dislodge as little dirt as possible.

2. Clean the filter sealing surface and the filter housing. 3. Install the new filter. 4. Install the cover and tighten the screws on the air

cleaner cover.

Refer to the Maintenance Schedule to determine when to replace the air filter. See “Owner Checks and Services” in the Index.

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Passenger Compartment Air Filter (If Equipped) Your vehicle may be equipped with a passenger compartment air filter. The filter is located under the instrument panel, below the glove compartment. Your vehicle may or may not be equipped with an access panel. To replace the passenger compartment air filter, do the following: 1. If your vehicle has an access panel, remove the bolts on it and set the panel aside. If your vehicle does not have the access panel, skip this step.

2. Next, pull downward

on the filter retaining bracket.

CAUTION:

Operating the engine with the air cleaner/filter off can cause you or others to be burned. The air cleaner not only cleans the air, it stops flame if the engine backfires. If it isn’t there, and the engine backfires, you could be burned. Don’t drive with it off, and be careful working on the engine with the air cleaner/filter off.

NOTICE:

If the air cleaner/filter is off, a backfire can cause a damaging engine fire. And, dirt can easily get into your engine, which will damage it. Always have the air cleaner/filter in place when you’re driving.

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3. Remove the air filter by pulling downward on the

element. Remove the second portion of the air filter by sliding it towards the rear of the vehicle and then pulling downward.

4. Install the new filter by reversing the steps listed previously. Be sure to follow any instructions that may be included in the replacement filter package.

Because this procedure can be a little difficult, you may choose to have it done at your dealer’s service department. Refer to the Maintenance Schedule to determine when to replace the passenger compartment air filter. See “Scheduled Maintenance” in the Index.

Automatic Transmission Fluid (Except Allison Transmission) When to Check and Change A good time to check your automatic transmission fluid level is when the engine oil is changed. Change both the fluid and filter every 50,000 miles (83 000 km) if the vehicle’s GVWR is over 8,600 or if the vehicle is mainly driven under one or more of these conditions: D In heavy city traffic where the outside temperature

regularly reaches 90_F (32_C) or higher.

D In hilly or mountainous terrain. D When doing frequent trailer towing. D Uses such as found in taxi, police or delivery service. If you do not use your vehicle under any of these conditions, change the fluid and filter every 100,000 miles (166 000 km). See “Scheduled Maintenance Services” in the Index.

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D In heavy traffic -- especially in hot weather. D While pulling a trailer. To get the right reading, the fluid should be at normal operating temperature, which is 180_F to 200_F (82_C to 93_C). Get the vehicle warmed up by driving about 15 miles (24 km) when outside temperatures are above 50_F (10_C). If it’s colder than 50_F (10_C), drive the vehicle in THIRD (3) until the engine temperature gage moves and then remains steady for 10 minutes. A cold fluid check can be made after the vehicle has been sitting for eight hours or more with the engine off, but this is used only as a reference. Let the engine run at idle for five minutes if outside temperatures are 50_F (10_C) or more. If it’s colder than 50_F (10_C), you may have to idle the engine longer. Should the fluid level be low during this cold check, you must check the fluid hot before adding fluid. Checking the fluid hot will give you a more accurate reading of the fluid level.

How to Check Because this operation can be a little difficult, you may choose to have this done at the dealership service department. If you do it yourself, be sure to follow all the instructions here, or you could get a false reading on the dipstick.

NOTICE:

Too much or too little fluid can damage your transmission. Too much can mean that some of the fluid could come out and fall on hot engine parts or exhaust system parts, starting a fire. Be sure to get an accurate reading if you check your transmission fluid.

Wait at least 30 minutes before checking the transmission fluid level if you have been driving: D When outside temperatures are above 90_F (32_C). D At high speed for quite a while.

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Then, without shutting off the engine, follow these steps:

Checking the Fluid Level Prepare your vehicle as follows: D Park your vehicle on a level place. Keep the

engine running.

D With the parking brake applied, place the shift lever

in PARK (P).

D With your foot on the brake pedal, move the shift lever through each gear range, pausing for about three seconds in each range. Then, position the shift lever in PARK (P).

D Let the engine run at idle for three minutes or more.

1. The red transmission dipstick handle is located at the

rear of the engine compartment, on the passenger’s side. See “Engine Compartment Overview” in the Index for further information on location. Flip the handle up and then pull out the dipstick and wipe it with a clean rag or paper towel.

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2. Push it back in all the way, wait three seconds and

then pull it back out again.

3. Check both sides of the dipstick, and read the lower

level. The fluid level must be in the COLD area, below the cross-hatched area, for a cold check or in the HOT area or cross-hatched area for a hot check. 4. If the fluid level is in the acceptable range, push the

dipstick back in all the way; then flip the handle down to lock the dipstick in place.

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How to Add Fluid Refer to the Maintenance Schedule to determine what kind of transmission fluid to use. See “Recommended Fluids and Lubricants” in the Index. Add fluid only after checking the transmission fluid while it is hot. (A cold check is used only as a reference.) If the fluid level is low, add only enough of the proper fluid to bring the level up to the HOT area for a hot check. It doesn’t take much fluid, generally less than one pint (0.5 L). Don’t overfill.

NOTICE:

We recommend you use only fluid labeled DEXRONR-III, because fluid with that label is made especially for your automatic transmission. Damage caused by fluid other than DEXRONR-III is not covered by your new vehicle warranty.

D After adding fluid, recheck the fluid level as

described under “How to Check.”

D When the correct fluid level is obtained, push the dipstick back in all the way; then flip the handle down to lock the dipstick in place.

Automatic Transmission Fluid (AllisonR Only) When to Check and Change A good time to check your automatic transmission fluid level is when the engine oil is changed. Change both the fluid and filter every 25,000 miles (41 500 km) if the vehicle is mainly driven under one or more of these conditions: D In heavy city traffic where the outside temperature

regularly reaches 90_F (32_C) or higher.

D In hilly or mountainous terrain. D When doing frequent trailer towing. D Uses such as found in taxi, police or delivery service. If you do not use your vehicle under any of these conditions, change the fluid and filter every 50,000 miles (83 000 km). See “Scheduled Maintenance Services” in the Index.

How to Check Because this operation can be a little difficult, you may choose to have this done at the dealership service department. If you do it yourself, be sure to follow all the instructions here, or you could get a false reading on the dipstick.

NOTICE:

Too much or too little fluid can damage your transmission. Too much can mean that some of the fluid could come out and fall on hot engine parts or exhaust system parts, starting a fire. Be sure to get an accurate reading if you check your transmission fluid.

Wait at least 30 minutes before checking the transmission fluid level if you have been driving: D When outside temperatures are above 90_F (32_C). D At high speed for quite a while. D In heavy traffic -- especially in hot weather. D While pulling a trailer.

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Checking the Fluid Level Prepare your vehicle as follows: D Park your vehicle on a level place. Keep the

engine running.

D With the parking brake applied, place the shift lever

in PARK (P).

D With your foot on the brake pedal, run the engine for at least once minute and shift to DRIVE (D). Then shift to NEUTRAL (N) and then REVERSE (R) to fill the hydraulic system. Then, position the shift lever in PARK (P).

D Allow the engine to run at idle (500 - 800 rpm).

Slowly release the brake pedal.

Then, without shutting off the engine, follow these steps:

Cold Check Procedure The purpose of the cold check is to determine if the transmission has enough fluid to be operated safely until a hot check can be made. The fluid level rises as fluid temperature increases. DO NOT fill above the COLD CHECK band if the transmission fluid is below normal operating temperatures. 1. Pull out the dipstick and wipe it with a clean rag or

paper towel.

2. Push it back in all the way, wait three seconds and

then pull it back out again.

3. Insert the dipstick into the tube and remove.

Check the fluid level reading. Repeat the check procedure to verify the reading.

4. If the fluid level is within the COLD CHECK band,

the transmission may be operated until the fluid is hot enough to perform a hot check. If the fluid level is not within the COLD CHECK band, add or drain fluid as necessary to bring the level into the middle of the COLD CHECK band.

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5. Perform a hot check at the first opportunity after the

normal operating temperature of 160_F (71_C) to 200_F (93_C) is reached.

6. If the fluid level is in the acceptable range, push the

dipstick back in all the way.

Hot Check Procedure The fluid must be hot to ensure an accurate check. The fluid level rises as temperature increases. 1. Operate the transmission in DRIVE (D) range until the normal operating temperature of 160_F (71_C) to 200_F (93_C) is reached.

2. Pull out the dipstick and wipe it with a clean rag or

paper towel.

3. Push it back in all the way, wait three seconds and

then pull it back out again. Repeat the check procedure to verify the reading.

4. Safe operating level is within the HOT RUN band on the dipstick. The width of the HOT RUN band represents approximately 1.06 quart (1.0 liter) of fluid at normal operating temperature.

5. If the fluid level is not within the HOT RUN band,

add or drain fluid as necessary to bring the fluid level to within the HOT RUN band.

6. If the fluid level is in the acceptable range, push the

dipstick back in all the way.

Consistency of Readings Always check the fluid level at least twice using the procedures described previously. Consistency (repeatable readings) is important to maintaining proper fluid level. If inconsistent readings persist, check the transmission breather to be sure it is clean and unclogged. If readings are still inconsistent, contact your dealer.

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How to Add Fluid Refer to the Maintenance Schedule to determine what kind of transmission fluid to use. See “Recommended Fluids and Lubricants” in the Index. Add fluid only after checking the transmission fluid while it is hot. (A cold check is used only as a reference.) If the fluid level is low, add only enough of the proper fluid to bring the level up to the HOT area for a hot check. It doesn’t take much fluid, generally less than one pint (0.5 L). Don’t overfill.

NOTICE:

We recommend you use only fluid labeled DEXRONR-III, because fluid with that label is made especially for your automatic transmission. Damage caused by fluid other than DEXRONR-III is not covered by your new vehicle warranty.

D After adding fluid, recheck the fluid level as

described under “How to Check.”

D When the correct fluid level is obtained,

push the dipstick back in all the way.

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Manual Transmission Fluid When to Check A good time to have it checked is when the engine oil is changed. See your maintenance schedule to find out when to change your transmission fluid. How to Check Because this operation can be a little difficult, you may choose to have this done at your GM dealership service department. If you do it yourself, be sure to follow all the instructions here, or you could get a false reading.

NOTICE:

Too much or too little fluid can damage your transmission. Too much can mean that some of the fluid could come out and fall on hot engine parts or exhaust system parts, starting a fire. Be sure to get an accurate reading if you check your transmission fluid.

Check the fluid level only when your engine is off, the vehicle is parked on a level place and the transmission is cool enough for you to rest your fingers on the transmission case. Then, follow these steps:

5-Speed for VORTEC 4300 V6 and 4800 V8 engines

shown, other manual transmissions similar

1. Remove the filler plug. 2. Check that the lubricant level is up to the bottom

of the filler plug hole.

3. If the fluid level is good, install the plug and be sure

it is fully seated. If the fluid level is low, add more fluid as described in the next steps.

How to Add Fluid Here’s how to add fluid. Refer to the Maintenance Schedule to determine what kind of fluid to use. See “Recommended Fluids and Lubricants” in the Index. 1. Remove the filler plug. 2. Add fluid at the filler plug hole. Add only enough fluid to bring the fluid level up to the bottom of the filler plug hole.

3. Install the filler plug. Be sure the plug is fully seated.

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How to Check and Add Fluid The proper fluid should be added if the level does not reach the bottom of the diaphragm when it’s in place in the reservoir. See the instructions on the reservoir cap.

Rear Axle When to Check Lubricant Refer to the Maintenance Schedule to determine how often to check the lubricant. Additional rear axle scheduled maintenance is required when trailer towing. See “Scheduled Maintenance Services” in the Index for more information.

Hydraulic Clutch The hydraulic clutch linkage in your vehicle is self-adjusting. The clutch master cylinder reservoir is filled with hydraulic clutch fluid. It is not necessary to regularly check clutch fluid unless you suspect there is a leak in the system. Adding fluid won’t correct a leak. A fluid loss in this system could indicate a problem. Have the system inspected and repaired. When to Check and What to Use

Refer to the Maintenance Schedule to determine how often you should check the fluid level in your clutch master cylinder reservoir and for the proper fluid. See “Owner Checks and Services” and “Recommended Fluids and Lubricants” in the Index.

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How to Check Lubricant

Four-Wheel Drive Most lubricant checks in this section also apply to four-wheel-drive vehicles. However, they have two additional systems that need lubrication. Transfer Case When to Check Lubricant Refer to the Maintenance Schedule to determine how often to check the lubricant. See “Periodic Maintenance Inspections” in the Index. How to Check Lubricant

1500 Series shown, 2500 LD Series similar.

2500 HD and 3500 Series located on rear axle cover.

The proper level for the 1500 Series is from 5/8 inch to 1 5/8 inch (15 mm to 40 mm) below the filler plug. The proper level for the 2500/3500 Series is from 0 to 3/8 inch (0 to 10 mm) below the filler plug. Add only enough fluid to reach the proper level. What to Use Refer to the Maintenance Schedule to determine what kind of lubricant to use. See “Recommended Fluids and Lubricants” in the Index.

Manual Transfer Case

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Front Axle When to Check Lubricant Refer to the Maintenance Schedule to determine how often to check the lubricant. See “Scheduled Maintenance Services” in the Index.

How to Check Lubricant

Automatic Transfer Case

If the level is below the bottom of the filler plug hole, you’ll need to add some lubricant. Add enough lubricant to raise the level to the bottom of the filler plug hole. Use care not to overtighten plug.

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

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

When the differential is cold, add enough lubricant to raise the level to 1/2 inch (12 mm) below the filler plug hole. When the differential is at operating temperature (warm), add enough lubricant to raise the level to the bottom of the filler plug hole.