1993 GMC Sierra Owners Manual

.I a..

Just 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.

K2390

6-2 1

What Kind of Oil to. Use: L .ook for three things:

K2543

SG SG must be on the. oil container, either by itself or combined with other quality designations, such letters show American Petroleum Institute

as SWCC, SWCD, SF,SG, CC, etc. These

(API) levels. of quality.

’

f you use oils that don’t have mgine damage not covered by your warranty.

the “SG” designation, you can cause%@@$&

@@qy$@

6-22

HOT

WEATHER

SAE low-30

L A

SAE SW-30 PREFERRED

COLD

WEATHER

SAE 5W-30

IF NEiTHER SAE 5W-30 NOR SAE 1OW-30 GRADE OILS ARE AVAILABLE, SAE 30 GRADE MAY BE USED AT TEMPERATURES ABOVE 40 DEGREES F (4 DEGREES C). DO NOT USE SAE 1OW-40, SAE 2OW-50 OR ANY OTHER GRADE OIL NOT RECOMMENDED

PO344

Vehicles with Light Duty Emissions As shown in this chart, SAE 5W-30 is best for your vehicle. However, you can use SAE IOW-30 if it’s going to be 0°F (-18°C) or above.

(8500 GVWR or less).

6-23

Service & Appearance Care

HOT

WEATHER

LOOK FOR THIS LABEL

SAE 1OW-30 PREFERRED above 0°F

(-18°C)

SAE 5W-30

IF NEITHER SAE 5W-30 NOR SAE 1OW-30 GRADE OILS ARE AVAILABLE, SAE 30 GRADE MAY BE USED AT TEMPERATURES ABOVE 40 DEGREES F (4 DEGREES C). DO NOT USE SAE 1OW-40, SAE 2OW-50 OR ANY OTHER GRADE OIL NOT RECOMMENDED

PO347

SAE 1OW-30

Emissions (8501 GVWR or more).

Vehicles with Heavy Duty As shown in this chart, SAE 1OW-30 is best for your vehicle. However, you can use SAE 5W-30 if it's going to be colder than 60°F (16°C) before your next oil change. When should use SAE 5W-30.

it's very cold, below

0°F (-18"C), you

6-24

These numbers on an Do not use other viscosity oils such as SAE IOW-40 or SAE 2OW-50.

oil container show its viscosity, or thickness.

the container will help you save fuel.

is used on most oil containers to help

this on the oil container, and use only those oils that

Energy Conserving

II Oils with these words on

This doughnut-shaped logo (symbol) you select the correct oil. You should look for display the logo. GM Goodwrench@ oil (in Canada, GM Engine Oil) meets for your vehicle. Engine Oil Additives: Don’t add anything something should be added. When to Change Engine Oil: See if any one of these is true for you:

to your oil. Your GM dealer is ready to advise if you think

all the requirements

10 miles

in door to door

than 4 miles (6 km).

is frequently operated off-road.

is true for your vehicle, then you need

is at low speed most of the time (as in stop-and-go traffic). trailer often.

Most trips are less It’s below freezing outside and most trips are less than (16 km). The engine delivery, or You tow a Most trips are through dusty places. The vehicle If any one of these oil and filter every 3,000 miles (5000 km) or 3 months-whichever comes first. Vehicles with Light Duty Emissions If none of them is true, change the oil every 7,500 miles (12 500 km) or 12 months-whichever comes first. Change the filter at the first oil change and at every other oil change after that. Vehicles with Heavy Duty Emissions (8501 GVWR or more). If none of them months-whichever comes first. Change the filter at every other oil change after that oil. If time determines when you change your oil, change the filter each time you change your oil.

the oil every 6,000 miles (10 000 km) or 12 the first oil change and at ‘if mileage determines when you change your

(8500 GVWR or

to change your

is true, change

less).

6-25

Service & Appearance Care

Engine Block Heater: An engine block heater can be a big help cold weather, 0°F (-18°C) or colder. If your vehicle has this option, see in the Index. “Engine Block Heater” What to Do with Used Oil: I CAUTION

if you have

to park outside in very

Used engine oil contains things that have caused skin cancer laboratory animals. Don’t let used oil stay on your skin for very 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.

If you change your own

to the environment.

of water. Instead, recycle

Used-oil can be a real threat 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 or into streams or bodies that collects used oil. If you have a problem properly disposing oil, ask your dealer, a service station or a local recycling center for help. Engine Oil (Diesel Engines) It’s a good idea order to get an accurate reading, the oil must be warm and the vehicle must be on level ground.

to check your engine oil level every time you get fuel. In

it on the ground, into sewers, it to a place of your used

it by taking

oil,

Turn off the engine and give the pan. If you don’t the

oil a few minutes to drain back into the oil

oil dipstick might not show the actual level.

K2394

6-26

T-

K2613

it back in all the

To Check Engine Oil: Pull out the dipstick and clean or a cloth, then push lower. When to Add Oil: If the oil add some 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.

way. Remove

is at or below the ADD line, then you’ll need

it with a paper towel it again, keeping the tip

Don’t add too much oil. gets above the proper operating range, your engine could I w

“‘I

If your engine has so much oil that the

L l

oil level be damaged.

to

ii I

..

6 -”

6-27

K2395

Service & Appearance Care

Just 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.

’

What Kind of Oil to Use: Look for these two things:

K2396

I’ :

CElSG For SAE 15W-40 or SAE 1OW-30, CE must be on the oil container. For SAE 30, CD must be there. These may be listed alone or with letters, such as CEISG, CE/SG/SF, SGICD, etc. These letters show American Petroleum Institute (API) levels

of qualijr.

the

NOTICE If you use oils that don’t have these designations, you can cause engine damage which is not covered by your warranty.

6-28

LOOK FOR THIS LABEL

PO346

SAE 15W-40 AS shown in this chart, SAE 15W-40 is best for your vehicle. However, you can use SAE 1OW-30 if before your next oil change. When it's very cold, below should use SAE 1OW-30

to improve cold starting. Also, with

it's going to be colder than 60°F (1 6°C)

0°F (-18"C), you

6-29

Service & Appearance Cam

heavy-duty applications at temperatures above freezing, 30 grade oil is recommended. These numbers on an oil container show its viscosity, Do not use other viscosity oils such as

32°F (O’C), SAE

or thickness.

SAE IOW-40 or SAE 2OW-50.

to help

only those oils that

This doughnut-shaped logo (symbol) is used on most oil containers you select the correct oil. You should look for this on the oil container, and use display the logo. GM Goodwrench@ oil (in Canada, GM Engine Oil) meets all the requirements for your vehicle. Engine Oil Additives: Don’t add anything to your something should be added. When to Change Engine Oil: See if any one of these

oil. Your GM dealer is ready to advise

is true for you:

if you think

10 miles (16

of the time (as

in door to door

4 miles (6 km).

Most trips are less than It’s below freezing outside and most trips are less than km). The engine is at low speed most delivery, or in stop-and-go traffic). You tow a trailer often. Most trips are through dusty places. The vehicle If any one of these oil and filter every 2,500 miles (4000 km) or 3 months-whichever comes first. If none of these km) or 12 months-whichever comes

is true for your vehicle, then you need

is frequently operated off-road

is true, change the oil and filter every 5,000 miles (8000

to change your

first.

6-30

I

What to Do with Used Oil: I I PAUTION

\ laboratory animals. Don’t let used oil stay on your skin for very long. Used engine oil contains things that have caused skin cancer in clnan your skin and nails with soap and water, or a good hand c,,aner. Wash or properly throw away clothing or rags containing used engine oil.

Used oil can be a real threat to the environment. be sure to drain all free-flowing oil from the filter before disposal. Don’t ever dispose of oil by putting or into streams or bodies of water. Instead, recycle it by taking If you have a problem properly disposing that collects used oil. oil, ask your dealer, a service station or a local recycling center for help. Air Cleaner

it in the trash, pouring

If you change your own oil,

it on the ground, into sewers,

it to a place of your used

Refer to the Maintenance Schedule to determine when to replace the cleaner filter on diesel engines and the air cleaner filter and crankcase ventilation filter on gasoline engines. See “Scheduled Maintenance Services’’ in the Index.

PO216

air

6-3 1

Service & Appearance Care

I IC\ Operating the engine with the air cleaner

to be burned. The air cleaner not only cleans the air, if the engine backfires. could be burned. Don't drive with the engine with the air cleaner

If it isn't there, and the engine backfires, you it off, and be careful working on

off.

off can cause you or others it stops flame

If the air cleaner dirt can easily get into your engine, which will dan le air cleaner in place when you're driving.

is off, a backfire can cause a damaging engine fire. And,

it. Alway!

3 tl

To remove the air cleaner filter on a gas engine, counterclockwise. Remove the cover and change the filter.

turn the wing nuts

fi 31 Fnning

6.5L Engine

On a 6.2L diesel engine there are two wing nuts. On a 6.5L diesel engine, unhook the clips.

K2151

6-32

to check your automatic transmission

Automatic Transmission Fluid When to Check and Change: A good time engine oil is changed. Refer to change your fluid. See "Scheduled Maintenance Services" in the Index. How to Check: Because this operation can be a done at a General Motors dealership Service Department. If you do it yourself, be sure get a false reading on the dipstick.

to follow all the instructions here,

little difficult, you may choose

to the Maintenance Schedule

fluid level is when the

to determine when

to have this

or you could

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

least 30 minutes before checking the transmission fluid level

Wait at have been driving:

if you

When outside temperatures are above At high speed for quite a while. In heavy traffic-especially While pulling a trailer.

in hot weather.

90°F (32°C).

the fluid must be at normal operating temperature,

To get the right reading, which is 180°F to 200°F (82°C to 93°C). To check the transmission fluid hot: Get the vehicle warmed up by driving 50°F (1 0°C). If about 15 miles (24 km) when outside temperatures are above it's colder than 50°F (lO°C), drive the vehicle in D (3rd gear) until the engine temperature gage moves and then remains steady for follow the hot check procedures. To check transmission fluid cold: has been sitting for eight hours or more with the engine as a reference. Let the engine run at idle for five minutes temperatures are 50°F (10°C) or more. may have added during a cold check.

A cold check is made after the vehicle off and is used only

If it's colder than 50°F (lO"C), you fluid is

to idle the engine longer. A hot check must follow when

ten minutes. Then

if outside

6-33

Senrr'ce & bmearance Care

To check the fluid hot or cold:

in P (Park) with the parking brake applied.

on the brake pedal, move the shift lever through each

on a level place.

Park your vehicle Place the shift lever With your foot gear range, pausing for about three seconds position the shift lever Let the engine run at idle for three minutes or more.

in P (Park).

in each range. Then,

Then, without shutting off the engine, follow these steps: it with a

pull out the dipstick and wipe

1. Flip the handle up and then clean rag or paper towel.

2. Push it back in

again.

all the way, wait

three seconds and then

PO229 pull it back out

634

3. Check both sides of level must be in the cross-hatched area for a hot check.

the dipstick, and read the COLD area for a cold check or

lower level. The fluid

in the HOT area or

4. If the fluid level is where

it should be, push the dipstick back in all the

way; then flip the handle down to lock the dipstick

in place.

to determine what kind of transmission

How To Add Fluid: Refer to the Maintenance Schedule fluid to use. See “Recommended Fluids and Lubricants’’ If the fluid up to the COLD area for a cold check or the HOT area for a hot check. doesn’t take much fluid, generally less than a pint. Don’t overfill. We recommend you use only fluid labeled DEXRON@IIE, because fluids with that label are especially made for your automatic transmission. Damage caused by fluid other than DEXRON@IIE is not covered by your new vehicle warranty.

level is low, add only enough of

the proper fluid to bring the level

in the Index.

It

After adding fluid, recheck the fluid level Check”. When the correct way; then flip the handle down

fluid level is obtained, push the dipstick back in place.

to lock the dipstick

in all the

as described under “How To

6-35

* Senrice & Appearance Care

Manual Transmission Huld When to Check: A good time to have it checked is when .the engine oil is changed. However, the fluid in your manual transmission doesn't require changing. How to 'Check: Because this operation can be a :little difficult, you may choose done at your dealership Service Department. If you do it yourself, be sure to get a false

follow' all the instructions here, or you could

reading..

to have this

Too much or too little fluid can damage your transmission. mean that some of the starting a fire. Be sure transmission fluid.

fluid could come out and fall on hot engine parts, if you check your to get an accurate reading

Too much can

. .. . . ...

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

is off, the vehicle is parked on

~~

1. Remove the filler plug. 2. Check that the lubricant level is up to the bottom 3. If the fluid level is

good, install the plug and be sure

the fluid level

is low, add more fluid as described

K2471

of the filler- plug hole.

it is fully seated.

in the next steps.

If

6-36

How to Add Fluid: Here’s how what kind of fluid Index.

to add fluid. Refer

to the Maintenance Schedule to determine

to use. See “Recommended Fluids and Lubricants”

in the

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 that the filler plug is fully seated. Hydraulic Clutch

112” to

The hydraulic clutch in your vehicle is self-adjusting. (112 inch to an inch)

in the pedal is normal.

A slight amount of play

K2376

6-37

-

Service & Amearance Care

When to Check and What to Use;

to determine how often you should check

your clutch master cylinder reservoir and what to add. See

Refer to the Maintenance Schedule the fluid level in “Owner Checks and Services” and “Recommended Fluids and Lubricants” the Index. How to Check:

The proper fluid should be added the diaphragm when it’s reservoir cap.

if the level does not reach the bottom

in place in the reservoir. See the instructions on the

6-38

in

K2344 of

clutch in the Index for the

Hydraulic Clutch Grease Fitting A grease fitting is on the clutch housing for lubricating the clutch fork ball stud. See your Maintenance Schedule for when to lubricate the housing. See “Recommended Fluids and Lubricants” proper lubricant to use. Be sure not to over-fill because you could damage your Four- Wheel Drive Most lubricant checks However, they have Transfer Case When to Check Lubricant: Refer to the Maintenance Schedule lubricant. See “Periodic Maintenance Inspections” How to Check and Add Lubricant:

two additional systems that need lubrication.

in this section also apply

to determine how often

in the Index.

clutch.

to check the

to four-wheel-drive vehicles.

If the level is below the bottom of the filler plug hole, you’ll need some lubricant. Add enough lubricant to raise the level filler plug hole. What to Use: Refer to the Maintenance Schedule to determine what use. See “Recommended Fluids and Lubricants”

in the Index.

kind of lubricant to

PO230

to add

to the bottom of the

639

Senrice d& Appearance Cam

Front Axle When to Check and Change Lubricant: Refer to the Maintenance Sched,ule to determine lubricant and when to change it. See “Scheduled the Index. How to Check Lubricant:

how often to check the Maintenance Services” in

PO231

filler plug hole, you’ll need to add

to the bottom of the filler plug hole.

(warm), add

If the. level is below the bottom of the some lubricant. If the differential is at operating temperature enough lubricant to raise the level If the differential is cold, (12 mm) below the filler plug hole. What to Use: Refer to the Maintenance Schedule use. See “Recommended Fluids and Lubricants’’

add, enough lubricant to raise the level

in the Index.

to determine what .kind of lubricant to

to 1/2 inch

- 1 ‘

6-40

. . .,.

...

Rear Axle When to Check and Change Lubricant: Refer to the Maintenance Schedule to determine how often to check the lubricant and when in the Index. How to Check iubricant:

to change it. See “Recommended Fluids and Lubricants”

of the filler plug hole,

level is below the bottom

If the some lubricant. Add enough lubricant filler plug hole. What to Use: Refer to the Maintenance Schedule to determine what kind use. See “Recommended Fluids and Lubricants” in the Index.

to raise the level

PO592

you’ll need to add to the bottom of the

of lubricant to

6-41

Service & Appearance ,Care

Engine Coolant

PO593

The following explains your cooling system and how to add coolant when it is low. If you have a problem with -engine overheating, see “Engine Overheating” in the Index. The proper coolant for your vehicle will: Give freezing protection down to Give boiling protection up to 258°F Protect against rust and corrosion: Help keep the proper engine temperature. Let the warning lights and gages work as

-34°F (-37°C).

thiy should.

(125°C).

clean water (preferably distilled), and antifreeze that meets

What to Use: Use a ,mixture of “GM Specification 6038-M,” which won’t damage aluminum parts. GM Engine Coolant Supplement (sealer) with you use these, you don’t need to add anything else.

a complete coolant change.

Also use If

6-42

1 CAUTION

4 Adding only plain water to your cooling system can be dangerous.

Plain water, or some

other liquid like alcohol, can boil before th(

)per coolant mix will. Your vehicle’s coolant warning system is set

for the proper coolant mix. With plain water or the wrong mix, your engine could get too hot but you wouldn’t get the overheat warning. Your engine could catch fire and you or others could be burned. Use a 50/50 mix of clean water and a proper antifreeze.

NOTICE If you use an improper coolant mix, your engine could overheat and badly damaged. The repair cost wouldn’t be covered much water core and other parts.

in the mix can

freeze and

x k +?e t

1:

by your warranty. 1 line radiator, heater

in the cooling system, can affect the

when the engine is cold

way to add

the low coolant warning system, refer to the General Motors

Some conditions, such as air trapped coolant level in the radiator. Check the coolant level and follow the steps under “Adding Coolant” for the proper coolant. If you have Service Manual or see your dealer for the proper coolant purchase a Service Manual, see “Service Publications’’ the wrong If you have check your cooling system. NOTICE If you use the proper coolant, you don’t have additives which claim

fill procedure can cause a low coolant warning indication. to add coolant more than four times a year, have your dealer

fill procedure. (To

in the Index.) Using

to improve the system. These can be harmful. -

to add extra inhibitors or

.I

6-43

Service & Amearance Care

Adding Coolant

To Check Coolant: When your engine is COLD, or a little higher. When your engine is warm, the level should to HOT, or a little higher.

cold, the coolant level should

PO206 be at be up

LOW

COOLANT

K2327

If this light comes on, To Add Coolant: If you need more coolant, coolant recovery tank.

it means you're low on engine coolant.

add the proper mix at the

6-44

CAUTION

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

to

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

’

You can be burned mtains ethylene glycol, and enough. Don’t spill coolant on a hot engine.

if you spill coolant on hot engine parts. Coolant it will burn if the engine parts are hot

Radiator Pressure Cap

1 Your radiator pressure cap overflow tube on the radiator filler neck. -

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

K2515

- I

When you replace your radiator pressure cap, an

ACa cap is recommended.

6-45

Service & Appearance Cam

Thermostat Engine coolant temperature is controlled by a thermostat system. The thermostat stops the flow of coolant through the radiator coolant reaches a preset temperature. When you replace your thermostat, an Power Steering Fluid

AC@ thermostat is recommended.

in the engine coolant until the

How To Check Power Steering Fluid: Unscrew the cap and wipe the dipstick with a clean and completely tighten level on the dipstick.

it. Then remove the cap again and look at the fluid

rag. Replace the cap

K2630

6-46

K2693

When the engine compartment is hot, the mark. When the engine compartment COLD mark.

is cool, the level

level should be at

the FULL

’

‘k

+- .”.’e--:

What to Add: Refer to the Maintenance Schedule to determine what See “Recommended Fluids and Lubricants’’

r When adding power steering

always use the proper fluid. Failure leaks and damage hoses and seals.

fluid or making a complete to use the proper

in the Index.

should be at

the FULL

K2694

kind of fluid to use.

fluid change, fluid can cause

6-47

Service & Appearance Care

Windshield Washer Fluid To Add: Open the cap labeled WASHER FLUID ONLY. Add washer bottle is full.

fluid until the

K2469

- When using a concentrated washer fluid, follow the manufacturer

instructions for adding water. Don’t mix water with ready-to-use washer fluid. Water can use 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 was fluid. Fill your washer fluid tank only allows for expansion, which could damage the tank full. Don’t use radiator antifreeze for your windshield washer. damage your washer system

3/4 full when it’s very cold. This

and paint.

It can

if it is CnrnDletely

6-48

Brake Master Cylinder Your brake master cylinder is here. It

is filled with DOT-3 brake fluid.

K2470

wear. When new

There are only two reasons why the brake fluid level in your master cylinder might go down. The first is that the brake level during normal brake lining level goes back up. The other reason is that system. If it is, you should have your brake system fixed, since that sooner or later your brakes won’t work well, or won’t work at all. isn’t a good idea to “top off” your brake fluid. Adding brake a leak. If you add 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. CAUTION

fluid when your linings are worn, then you’ll have too

fluid goes down to an acceptable linings are put in, the fluid

fluid is leaking out of the brake a leak means So, it fluid won’t correct

-\ will burn

If you have too much brake fluid,

if the engine is hot enough. and your vehicle could be damaged. Add is done on the brake hydraulic system.

it can spill on the engine. The

fluid You or others could he burned en wn

. ake fhid nnlv

to determine when to check your brake

Refer to the Maintenance Schedule fluid. See “Periodic Maintenance” in the index. 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 the

6-49

Service & Appearance Care

to see if there is a

MIN mark. If they aren’t, have your brake system checked leak. After work is done on the brake hydraulic system, make sure the levels are above MIN and below the top What To Add: When you do need brake fluid, use only DOT-3 brake fluid-such as Delco Supreme 11 @ (GM Part No. 1052535). Use new brake fluid from a sealed container only.

of each window.

to or adding

is also used as the Hydro-boost pump. Refer in this section when checking fluid level

Hydro-Boost Brake System (Hydraulic Pump) The power steering pump “Power Steering System” fluid. Replacing Brake System Parts The braking system on be of ‘top quality and work well together braking. Vehicles we design and test have top-quality them, as your vehicle does when braking system-for example, when your brake linings wear down 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. example, if someone puts balance between your front and rear brakes can change; for the worse. The

.a modern vehicle is complex.

it is new. When you replace

if the vehicle is

in brake linings that are wrong for your vehicle, the

Its many parts have to to have really good

GM brake parts

in

parts of your

and you

For

’ braking performance you’ve come

if someone puts in the wrong replacement brake parts.

to expect can change

in many other ways

. . .‘,

6-50

tell you how often to lubricate the fittings. See in the Index for the proper lubricant to

Other Maintenance Items Front Suspension and Steering Linkage Your maintenance schedule will “Recommended Fluids and Lubricants’’ use. Front Wheel Bearings Your vehicle has front wheel bearings that must be cleaned and repacked. Your maintenance schedule will Front Shock Absorbers The front shock absorbers of your vehicle do many things. They help the vehicle ride smoothly and also control the travel When the shock absorbers are serviced, any replacement shock absorbers must be the same as the original equipment shock absorbers extended length and strength. 1 NOTICE

tell you how often this must be done.

in both

of the suspension system.

If you use shock absomers that I absorbers, the shock absorbers or suspension system could be damaged.

are nor me same as

the original shock

100, 1,000 and 6,000 miles (160, 1600 and

Wheel Nut Torque For vehicles with dual wheels, when the vehicle, wheel or fasteners are new, have the torque set at the first 9600 km). Use the torque specified in the appropriate Specification Chart later in this section. Single Belt Accessory Drive If your new vehicle uses than systems with several belts. The belt runs over to keep the belt tight at 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 route the belt your vehicle uses.

a serpentine belt, it is lighter, and more durable

all times. The tensioner also makes replacing the

or around the pulleys

on the engine. A tensioner is used

to

6-5 1

Service & Appearance Care

Windshield Wiper Blade Inserts

- r

lift the wiper arm and rotate the

PO232

in place.

To replace the windshield wiper blade insert, 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 Make sure the blade is secured in the clips. Air Conditioning Every now and then have your dealership check your air conditioning system If you think the system to be sure it has not lost any cooling ability. 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 Fluid Leak Check After the vehicle has been parked for a while, inspect the surface under the or other fluids. Water dripping from the air vehicle for water, oil, fuel conditioning system after it has been used is normal, If you notice 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” the Index for the proper lubricant to use.

is not

(4°C).

fuel leaks

in

6-52

in the

in the

is cold.

Accelerator cables and cruise control cables should not be lubricated. Any cables that are worn or are hard to pull should be replaced. Remove external deposits from injector pump face cam on 6.2L diesel engines, when the engine 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” 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 maintenance schedule to find out how often the constant velocity joints must be lubricated. See “Recommended Fluids and .Lubricants” Index for the proper lubricant to use. 80dy Normal use of your vehicle will cause metal to metal wear at some points on the cab and body For exposed surfaces, such as door checks, door lock bolts, lock striker plates, dovetail bumper wedges, etc., a thin film applied. The seat adjusters and seat track should Door weather strips and rubber hood bumpers should rubber lubricant. Never use too much lubricant when you are finished. Your maintenance schedule will tell you how often to lubricate these Ilems. 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” use.

in the Index for the proper lubricant to

be sure to wipe up any extra

if they are not lubricated.

of engine oil should be

of any lubricant and

be lubricated with chassis grease.

be lightly coated with a

6-53

Service & Appearance Care

wash out the factory which contain alcohol

to lubricate the lock after

to keep

often to lubricate the handle. in the Index for the proper

the lubricant, so be sure

You should not use penetrating oils because they could installed lubricant and cause the lock to bind. De-icers could also wash away using a de-icer of this type. Tailgate Handle The tailgate handle pivot points on your vehicle should be lubricated it working smoothly. Your maintenance schedule will tell you how See “Recommended Fluids and Lubricants” lubricant to use. Electrical System Battery Every new GM vehicle has a Delco Freedom@ battery. 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 black, negative (-) from running down.

to drive your vehicle for cable from the battery. This will help keep your battery

25 days or more,

You never have

to

take off the

- Batteries have acid that can burn you and gas that can explode.

can be badly hurt if you aren’t careful. See “Jump Starting” Index for tips on working around a battery without getting hurt.

You I

in the

to learn how to prepare your vehicle for longer periods.

Contact your dealer Bulb Replacement Before you replace any bulbs, be sure that engine isn’t running.

all the lights are off and the

6-54

Sealed Beam Headlights

1. Remove the four screws from the headlight retainer. 2. Pull the headlight out and remove the retainer. 3. Unplug and remove old headlight. 4. Plug in the new headlight and put it 5. Install the retainer to the headlight. 6. Install the screws. Halogen Bulbs

in place.

Halogen bulbs have pressurized gas inside and can burst or scratch the bulb. You or others could be injured. Take special care when handling and disposing of halogen bulbs. & s+?-.- --_

>= - - . * . . . ,x. J - * - :hi , ._..

-%.

if you drop

i , c: .-?v2 f q k - s q

- L a c

Avoid touching the bulb or Oil from your skin or moisture on when it is turned on. If either comes in contact with the bulb, clean alcohol or a suitable degreaser and wipe the bulb

the bulb can cause the bulb

letting it come in contact with anything damp

dry.

to explode it with

6-55

Service & Appearance Care

Composite Headlights

PO234

1. Remove the two screws at the top of the radiator support. 2. Pull the composite headlight lens out. 3. Unplug the electrical connector. 4. Turn the bulb counterclockwise and remove it. 5. Put the new bulb in and turn 6. Plug in the electrical connector. 7. Put the headlight back into the vehicle and tighten the

it clockwise until

it is tight.

two screws.

6-56

Front Parkinflurn Signal Lights

1. Remove the screws and take out the parking/turn signal light assembly.

K2681

K2682

2. Squeeze the tab on the side

of the light socket while turning the socket

counterclockwise. 3. Pull out the socket. 4. Push in gently on the bulb, turn it counterclockwise and remove

it from

the socket.

6-57

Service & Amearance Care

5. Put the new bulb into the socket, gently press

clockwise until

it is tight.

in on the bulb and

turn it

6. Put the socket back into the light assembly and turn it clockwise until

locks.

it

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

tighten the screws. Side Marker Bulb

1. Remove the screws and pull out the parkinghurn signal light assembly. 2. Reach through the opening and turn the side marker bulb socket counterclockwise and remove it.

II

K2683

3. Pull the bulb straight out 4. Put a new it in until 5. Put the socket back into the side marker assembly and turn

bulb into the socket and push

of the socket.

to tighten it.

it is tight.

it clockwise

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

6-58

Fender Marker Lights

PO248

1. Remove the screws and take the lens assembly out 2. Turn the bulb socket counterclockwise and remove it from the lens

of the fender.

assembly.

it in until it is tight.

into the lens assembly and turn

it clockwise to

3. Pull the bulb straight out 4. Put a new bulb into the socket and push 5. Put the socket back

of the socket.

tighten it.

6. Replace the lens and tighten the

screws.

6-59

Service & Appearance Cam

Tailgate Marker Lights

PO249

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

holder.

2. Unplug the the lenslbulb assembly at the connecter wire. 3. Plug in a new lendbulb assembly and push the connecter wire into the

hole in the tailgate.

4. Snap the lenslbulb assembly into the lens holder.

Roof Marker Lights

6-60

lift off the lens. of the socket

1. Remove the screws and 2. Pull the bulb straight out 3. Put a new bulb into the socket and push 4. Replace the lens and tighten the screws. Cargo Light

it in until it is tight.

, .. .....

PO250

1. Remove the screws and lift 2. Pull the old bulb straight out 3. Put a new bulb into the socket and push it 4. Replace the lens and tighten the screws.

off the lens. of the socket

in until it is tight.

6-61

Service & Appearance Care

Rear Lights, Pickup Models

1. Open the tailgate. 2. Remove the two rear light assembly screws near the tailgate latch and

pull out the light

assembly.

PO496

off the light

3. Remove the screws from the bulb retainer and take it

assembly.

4. Pull the old bulb straight out of the socket 5. Put in a new bulb and push it in until it is tight.

6-62

6. Replace the bulb retainer. 7. Replace the rear light assembly and tighten the screws. 8. Close the tailgate. Sear Lights, Chassis Cab Models

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 assembly

6-63

PO497

Service & Appearance Care

4. Push in gently on the bulb, turn

the socket.

5. Put in a new bulb and, pushing

tight.

it counterclockwise and remove

it from

in gently, turn it clockwise until

it is

6. Put the socket back

seal.

in the light assembly and replace the lens and lens

on and off, or in some cases to

in the wiring

of fires caused by electrical problems.

in the Index for more information.

by a circuit breaker in the light switch. An

in your vehicle are protected from short circuits by a

Fuses and Circuit Breakers The wiring circuits combination of fuses, circuit breakers, and fusible thermal links itself. This greatly reduces the chance See “Fuses and Circuit Breakers’’ Headlights The headlight wiring is protected electrical overload will cause the lights to go remain off. If this happens, have your headlight wiring checked right away. Windshield Wipers The windshield wiper motor is protected by a circuit breaker and a fuse. If the motor overheats due motor cools. If the overload is caused by some electrical problem and not snow, etc., be sure Power Windows and Other Power Options Circuit breakers in the fuse panel protect the power accessories. When the current and closes, protecting the circuit until the problem is fixed Trailer Wiring Harness The optional seven-wire trailer wiring harness in the battery feed wire. This fuse Wiring Harness”

to heavy snow, etc., the wiper will stop until the

load is too heavy, the circuit breaker opens

is near the junction block. See “Trailer

in the Index for more information.

is protected by an

to get it fixed.

or goes away.

windows and other power

in-line fuse

6-64

Fuse Block

K2644

if you have one.

pull straight out.

to use the correct fuse.

To remove hold the end of the fuse between your thumb

is in the instrument panel on the driver’s side.

The fuse block You can remove fuses with a fuse extractor, fuses if you don’t have one, and index finger and Be sure don’t have a spare fuse, you can “borrow’’ one some feature of your vehicle that you can get along without-like cigarette lighter-and use its fuse, if it is of the value you need. Replace as soon as you can. See “Fuses and Circuit Breakers” information. Exhaust System To help prevent damage your vehicle if you notice:

to your exhaust system, do not continue

If you ever have a problem on the

it in the Index for more

of the correct value. Just pick

to drive

road and

the radio or

Engine misfiring Loss of performance Other unusual operating conditions

Have your engine and exhaust system serviced regularly. Three- Way Cataiytic Converter Your vehicle’s three-way catalytic converter pollutants in your vehicle’s exhaust. Use only unleaded fuel

is designed to reduce the

in your vehicle. If

6-65

If you use

(OS) sensor and three-way

(OS) sensor that helps keep your engine’s air-fuel

leaded fuel, you could damage your three-way catalytic converter,

you use and other engine components. Computer Command Control System (All TBI equipped vehicles and diesel engine vehicles below 8,500 lbs. GVWR) Gasoline Engines This system has an oxygen mixture at a proper level. Use only unleaded fuel in your vehicle. leaded fuel, you could damage your oxygen 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. The Malfunction Indicator Lamp instrument panel lets you know when your emission control system needs service. The light will come on briefly when you start your engine to let you know that the system is working. If engine, or need service. Your vehicle should still be driveable, but you should have your system serviced right away. Secondary Air Injection (AIR) System You may have wiring harness or solenoid need service. (Service Engine Soon) comes on, you need service.

if your engine control module, If the Malfunction Indicator Lamp

if it comes on and stays on while you’re driving your system may

it does not come on when you start your

(SERVICE ENGINE SOON) on your

this system. It lets you know

6-66

Loading Your Vehicle

of your

of the driver’s door or in

to obtain the gross weight

called the GVWR (Gross Vehicle Weight

The CertificationKire label is found on the rear edge the incomplete vehicle document in the cab. The label shows the size original tires and the inflation pressures needed capacity of your vehicle. This is Rating). The GWVR includes the weight of the vehicle, all occupants, fuel and cargo. The CertificationKire 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 and weigh your vehicle. Your dealer can help you with this. spread out your load equally on both sides of the centerline+ Never exceed the GVWR for your vehicle, or (GAWR) for either the front or rear axle. And, if you do have a heavy load, you should spread

to go to a weigh station the Gross, Axle Weight Rating-

.Be sure to

.. , - : I . - I l r T 1 I

it out.

. -1 r ,

In the case of a sudden stop or collision, things carried in the bed

r!\ your truck could shift forward and come into the passenger area,

injuring you and others. you should make sure they are properly secured.

If you put things in the bed

of your truck,

of 7

6-67

Service & Appearance Care

A Do not load your vehicle any heavier than the - b maximum front and rear GAWRs. If you do, parts on your vehicle

G W R or the

can break, or it can change the way your vehicle handles. These could cause you life of your vehicle.

to lose control. Also, overloading can shorten the

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.

.,ur warranty does nnt cover par nr componentg that fail becausl overloading.

If you put things inside your vehicle-like suitcases, tools, packages, anything else-they will go as fast as the vehicle goes. or turn quickly, or if there is a crash, they’ll keep going.

or

If you have to stop

* Things you put inside your vehicle can strike and injure people d sudden stop or

turn, or in a crash.

in a

9 Put things in the cargo area of your vehicle. Try

weight evenly.

to spread the

9 Never stack heavier things,

like suitcases, inside the vehicle

so

that some of them are above the tops of the seats. When you carry something inside the vehicle, secure whenever you can. Don’t have a seat folded down unless you need

to.

it

6-68

.;

Trajlering Package

PO339

8 load rating

it tows. This rating is

figure the weight of the people inside as

to include the weight of everything you part of

If your vehicle comes with the Trailering Package, there is also of the vehicle and the trailer which includes the weight called the Gross Combination Weight Rating (GCWR). When you weigh your trailer, be sure put in it. And, remember to your load. Your dealer can help you determine your GCWR. Add-on Equipment When you carry removable items, like snow put a limit on how many people you carry weigh your -vehicle -before you buy and install

plow. blades, you may need inside your vehicle. Be sure

the new equipment.

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

~____~~..

. _ _

6-69

. .

to to

’

Service & Appearance Care

, .

*.

Truck-Camper Loading Information Open your glove box door and

look for this label:

PO338

This label will tell you how much to spread out your load the right way. slide-in camper to your vehicle. When you carry a slide-in camper, the total cargo load weight of the camper,

plus

everything else added to the camper after everything in the camper; and all the people inside.

of a load your vehicle can carry, and how Also, it will help you match the right

of your vehicle is the

it left the factory;

I ne Cargo Weight Rating (CWR) is the maximum weight of the load your vehicle can carry. can figure about

It doesn’t include the weight of the people inside. But, you 150 pounds for each seat.

The total carqo load must not be more than your vehicle’s CWR.

TRUCK LOADING INFORMATION

EXAMPLE OF PROPER TRUCK

AND CAMPER MATCH

--7

c ‘

1. Recommended location

for cargo center of gravity for cargo weight rating (Pickup Truck). Note: Use rear edge of load floor for measurement purposes.

1. Camper center of gravity, 2. Recommended center of gravity

location zone.

* Refer to Truck Camper Loading

Information label in glove box for “A” and “8” dimensions.

PO484

of

to your vehicle.

Your dealer can help you with

accessories or other equipment you add

its load weigh less then the CWR, the center

The camper’s center of gravity should fall within the center of gravity zone for your vehicle’s cargo load. You must weigh any Then, subtract this extra weight from the CWR. This extra weight may shorten the center of gravity zone for your vehicle. this. If your slide-in camper and 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. After you’ve loaded your vehicle and camper, drive weigh on the front and rear wheels separately. This will your axles. The loads on the front and rear axles shouldn’t be more than either of the GAWRs. The the GVWR. Open your driver’s door and look at the GWAR and GVWR. If you’ve gone over your weight ratings, move or take out some things until all the weights any loose items when you When you install and instructions.

load your slide-in camper, check the manufacturer’s

fall below the ratings. Of course, you should always

total of the axle loads should not be more than

load your vehicle or camper.

to a weigh station and

tell you the loads on

Certificationnire label to find out your

tie down

6-7 1

Service & Appearance Care

load the

of gravity zone for your vehicle, your dealer can

the CWR for your vehicle. Weigh so that you won’t go over the GVWR

of your

in the Index.

hitch loads from

Trailer Recommendations You must subtract your your vehicle with your trailer attached, or the GAWR. if you spread out the weight You’ll get the best performance right way, and if you choose the correct hitch and trailer brakes. For more information, see “Trailer Towing” If you want more information on curb weights, cargo weights, cargo weight rating and the correct center help you. Just ask for a copy of “Consumer Information, Truck-Camper Loading.” Pickup Conversion lo. Chassis Cab General Motors is aware that some vehicle owners may consider having pickup box removed and a commercial you do so, first contact the GM Zone Office 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 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. Tires We don’t make tires. Your new vehicle comes with high quality a leading tire manufacturer. These tires are warranted by the tire manufacturers and their warranties are delivered with every new vehicle. your spare tire