1999 CHEVROLET SILVERADO check engine light

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4-43
CAUTION:
Snow can trap exhaust gases under your vehicle.
This can cause deadly CO (carbon monoxide) gas
to get inside. CO could overcome you and kill
you. You can't see it or smell it, so you might not
know it is in your vehicle. Clear away snow from
around the base of your vehicle, especially any
that is blocking your exhaust pipe. And check
around again from time to time to be sure snow
doesn't collect there.
Open a window just a little on the side of the
vehicle that's away from the wind. This will help
keep CO out.
Run your engine only as long as you must. This saves
fuel. When you run the engine, make it go a little faster
than just idle. That is, push the accelerator slightly.
This uses less fuel for the heat that you get and it keeps
the battery (or batteries) charged. You will need a
well
-charged battery (or batteries) to restart the vehicle,
and possibly for signaling later on with your headlamps.
Let the heater run for a while.
If you have a diesel engine, you may have to run it at a
higher speed to get enough heat. Then, shut the engine
off and close the window almost all the way to preserve
the heat. Start the engine again and repeat this only
when you feel really uncomfortable from the cold. But
do it as little as possible. Preserve the fuel as long as you
can. To help keep warm, you can get out of the vehicle
and do some fairly vigorous exercises every half hour or
so until help comes.

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5-5
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 batteries have enough water. You
don't need to add water to the ACDelco
Freedom

battery (or batteries) 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.
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 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.
CAUTION:
Fans or other moving engine parts can injure you
badly. Keep your hands away from moving parts
once the engine is running.

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6-12
Engine Oil (Gasoline Engine)
If your vehicle has a diesel engine, see ªEngine Oil
(Diesel Engine)º in the Diesel Engine Supplement.
If the CHECK ENG OIL
LEVEL light on the
instrument panel comes on,
it means you need to check
your engine oil level
right away.
For more information, see ªCHECK ENG OIL LEVELº
in the Index. You should check your engine oil level
regularly; this is an added reminder.
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.
The engine oil dipstick has
a yellow ring handle and is
located on the passenger's
side of the engine.
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.

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6-16
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.
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 ªOwner Checks and Servicesº 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 ªCHANGE FILTERº will
be highlighted. After changing the air filter, press the top
button on the indicator to reset it.

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7-19 At Least Twice a Year
Restraint System Check
Make sure the safety belt reminder light and all your
belts, buckles, latch plates, retractors and anchorages are
working properly. Look for any other loose or damaged
safety belt system parts. If you see anything that might
keep a safety belt system from doing its job, have it
repaired. Have any torn or frayed safety belts replaced.
Also look for any opened or broken air bag coverings,
and have them repaired or replaced. (The air bag system
does not need regular maintenance.)
Wiper Blade Check
Inspect wiper blades for wear or cracking. Replace blade
inserts that appear worn or damaged or that streak or
miss areas of the windshield. Also see ªWiper Blades,
Cleaningº in the Index.Air Cleaner Filter Restriction Indicator Check
Your vehicle has an indicator located on the air cleaner
in the engine compartment that lets you know when the
air cleaner filter is dirty and needs to be changed. Check
indicator at least twice a year or when your oil is
changed, whichever occurs first. See ªAir Cleanerº in
the Index for more information. Inspect your air cleaner
filter restriction indicator more often if the vehicle is
used in dusty areas or under off road conditions.
Weatherstrip Lubrication
Silicone grease on weatherstrips will make them last
longer, seal better, and not stick or squeak. Apply
silicone grease with a clean cloth. During very cold,
damp weather more frequent application may be
required. (See ªRecommended Fluids and Lubricantsº in
the Index.)

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9-1
Section 9 Index
A
ccessory Power Outlet 2-65 . . . . . . . . . . . . . . . . . . . . . . . . .
Adding Equipment to the Outside of Your Vehicle 6-3 . . . . . .
Air Bag 1-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adding Equipment 1-35 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How Does it Restrain 1-29 . . . . . . . . . . . . . . . . . . . . . . . . . .
How it Works 1-27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Location 1-27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Off Light 1-33, 2-71 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Off Switch 1-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Readiness Light 1-27, 2-71 . . . . . . . . . . . . . . . . . . . . . . . . .
Servicing 1-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What Makes it Inflate 1-29 . . . . . . . . . . . . . . . . . . . . . . . . . .
What Will You See After it Inflates 1-29 . . . . . . . . . . . . . . .
When Should it Inflate 1-28 . . . . . . . . . . . . . . . . . . . . . . . . .
Air Cleaner Filter, Engine 6-16 . . . . . . . . . . . . . . . . . . . . . . . .
Air Cleaner Filter Restriction Indicator Check 7-19 . . . . . . . .
Air Conditioning 3-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Conditioning Refrigerants 6-76 . . . . . . . . . . . . . . . . . . . . .
Air Dam Removal 4-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Dam Replacement 4-16 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Filter, Passenger Compartment 3-5, 6-18, 6-77 . . . . . . . .
Alignment and Balance, Tire 6-51 . . . . . . . . . . . . . . . . . . . . . .
Aluminum Wheels, Cleaning 6-59 . . . . . . . . . . . . . . . . . . . . . .
Antenna 3-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Antifreeze 6-29, 6-75, 7-25 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Anti-Lock
Brake System Warning Light 2-74, 4-7 . . . . . . . . . . . . . . . .
Brakes 4-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Appearance Care 6
-54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appearance Care and Materials 6-62 . . . . . . . . . . . . . . . . . . . .
Arbitration Program 8-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Armrest Storage Compartment 2-64 . . . . . . . . . . . . . . . . . . . .
Ashtrays 2-64 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audio Equipment, Adding 3-26 . . . . . . . . . . . . . . . . . . . . . . . .
Audio Systems 3-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Transmission
Check 7
-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid 6-19, 7-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Park Mechanism Check 7-22 . . . . . . . . . . . . . . . . . . . . . . . .
Starting Your Engine 2-16 . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation 2-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Auxiliary Battery 4-69 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Auxiliary Roof Mounted Lamp Switch 2-54 . . . . . . . . . . . . . .
Axle, Front 6-27, 7-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Axle, Locking Rear 2-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Axle, Rear 6-25, 7-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery 6-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Auxiliary 4-69 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jump Starting 5-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Message 2-82 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement, Keyless Entry 2-7 . . . . . . . . . . . . . . . . . . . . .
Run-Down Protection 2-56 . . . . . . . . . . . . . . . . . . . . . . . . .
Warnings 5-3, 5-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BBB Auto Line 8-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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9-2
Before Leaving on a Long Trip 4-37 . . . . . . . . . . . . . . . . . . . .
Better Business Bureau Mediation 8-3 . . . . . . . . . . . . . . . . . . .
Blizzard, Driving In 4-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake
Adjustment 6
-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid 6-34, 7-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Master Cylinder 6-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parking 2-33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pedal Travel 6-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing System Parts 6-37 . . . . . . . . . . . . . . . . . . . . . . . .
System Warning Light 2-74 . . . . . . . . . . . . . . . . . . . . . . . . .
Trailer 4-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission Shift Interlock Check 7-21 . . . . . . . . . . . . . . .
Wear 6-36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brakes, Anti-Lock 4-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Braking 4-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Braking in Emergencies 4-9 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Break-In, New Vehicle 2-13 . . . . . . . . . . . . . . . . . . . . . . . . . .
BTSI Check 7-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bulb Replacement 6-38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Camper Type Mirror 2-59 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Camper Wiring Harness 4-52 . . . . . . . . . . . . . . . . . . . . . . . . . .
Canadian Roadside Assistance 8-7 . . . . . . . . . . . . . . . . . . . . . .
Capacities and Specifications 6-74 . . . . . . . . . . . . . . . . . . . . . .
Carbon Monoxide 2-39, 2-40, 4-43 . . . . . . . . . . . . . . . . . . . .
Care of Your Cassette Tape Player 3-27 . . . . . . . . . . . . . . . . . .
Cargo
Lamp 2
-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lamp Bulb Replacement 6-41 . . . . . . . . . . . . . . . . . . . . . . .
Lamp On Message 2-87 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cassette Deck Service 7-18 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cassette Tape Player 3-11, 3-13 . . . . . . . . . . . . . . . . . . . . . . . Cassette Tape Player Care 3
-27 . . . . . . . . . . . . . . . . . . . . . . . .
Cassette/Compact Disc Storage 2-63, 2-64 . . . . . . . . . . . . . . .
Cellular Telephone 2-65 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Center High-Mounted Stoplamp Bulb Replacement 6-41 . . . .
Center Overhead Console 2-60 . . . . . . . . . . . . . . . . . . . . . . . .
Center Passenger Position 1-36 . . . . . . . . . . . . . . . . . . . . . . . .
Certification Label 4-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Certification/Tire Label 4-46 . . . . . . . . . . . . . . . . . . . . . . . . . .
Chains, Safety 4-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chains, Tire 6-53 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Change Engine Oil Message 2-86 . . . . . . . . . . . . . . . . . . . . . .
Changing a Flat Tire 5-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Coolant Temp Message 2-84 . . . . . . . . . . . . . . . . . . . . .
Check Eng Oil Level Message 2-85, 6-12 . . . . . . . . . . . . . . . .
Check Eng Oil Pressure Message 2-85 . . . . . . . . . . . . . . . . . .
Checking Transmission Fluid 6-22 . . . . . . . . . . . . . . . . . . . . .
Checking Your Restraint Systems 1-66 . . . . . . . . . . . . . . . . . .
Chemical Paint Spotting 6-61 . . . . . . . . . . . . . . . . . . . . . . . . . .
Child Restraints 1-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Securing in a Rear Outside Seat Position 1-54 . . . . . . . . . . .
Securing in the Center Seat Position 1-56 . . . . . . . . . . . . . .
Securing in the Right Front Seat Position 1-58 . . . . . . . . . .
Top Strap 1-52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Where to Put 1-50, 1-51 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chrome Wheels, Cleaning 6-59 . . . . . . . . . . . . . . . . . . . . . . . .
Cigarette Lighter 2-64 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Breakers and Fuses 6-65 . . . . . . . . . . . . . . . . . . . . . . .
Cleaner, Air 6-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning
Aluminum Wheels 6
-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exterior Lamps/Lenses 6-58 . . . . . . . . . . . . . . . . . . . . . . . .
Fabric 6-54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glass Surfaces 6-57 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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9-3
Inside of Your Vehicle 6-54 . . . . . . . . . . . . . . . . . . . . . . . . .
Instrument Panel 6-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interior Plastic Components 6-56 . . . . . . . . . . . . . . . . . . . . .
Leather 6-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Outside of Your Vehicle 6-58 . . . . . . . . . . . . . . . . . . . . . . . .
Special Problems 6-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stains 6-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tires 6-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vinyl 6-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wheels 6-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windshield and Wiper Blades 6-57 . . . . . . . . . . . . . . . . . . .
Climate Control System 3-2, 3-3 . . . . . . . . . . . . . . . . . . . . . . .
Clock, Setting the 3-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clutch Fluid, Hydraulic 6-24, 7-25 . . . . . . . . . . . . . . . . . . . . .
Clutch, System Check 7-20 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Comfort Controls 3-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Comfort Guides, Rear 1-41 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compact Disc Care 3-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compact Disc Player 3-18, 3-22 . . . . . . . . . . . . . . . . . . . . . . .
Compact Disc Player Care 3-28 . . . . . . . . . . . . . . . . . . . . . . . .
Compass, Rearview Mirror with 2-56 . . . . . . . . . . . . . . . . . . .
Console Storage 2-63 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Content Theft-Deterrent 2-11 . . . . . . . . . . . . . . . . . . . . . . . . .
Control of a Vehicle 4-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Convex Outside Mirror 2-60 . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant 6-29, 6-75, 7-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heater, Engine 2-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Surge Tank 5-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant Surge Tank Pressure Cap 6-28 . . . . . . . . . . . . . . . . . .
Cooling System 5-12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Courtesy Transportation 8-8 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cruise Control 2-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cruise Light 2-80 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cupholders 2-63 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Customer Assistance for Text Telephone Users 8
-4 . . . . . . . . .
Customer Assistance Information 8-1 . . . . . . . . . . . . . . . . . . .
Customer Satisfaction Procedure 8-2 . . . . . . . . . . . . . . . . . . . .
Damage, Finish 6-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Damage, Sheet Metal 6-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Daytime Running Lamp Bulb Replacement 6-40 . . . . . . . . . .
Daytime Running Lamps 2-52 . . . . . . . . . . . . . . . . . . . . . . . . .
Dead Battery 5-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defects, Reporting Safety 8-10 . . . . . . . . . . . . . . . . . . . . . . . .
Defensive Driving 4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defogger, Rear Window 3-6 . . . . . . . . . . . . . . . . . . . . . . . . . .
Defogging and Defrosting 3-6 . . . . . . . . . . . . . . . . . . . . . . . . .
Dolby B Noise Reduction 3-16 . . . . . . . . . . . . . . . . . . . . . . . .
Dome Lamps 2-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door
Locks 2
-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Third 2-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Downshifting 2-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver Position 1-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driving
City 4
-35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defensive 4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drunken 4-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Freeway 4-36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
In a Blizzard 4-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
In the Rain 4-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Night 4-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Off-Road 4-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On Curves 4-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On Grades While Towing a Trailer 4-62 . . . . . . . . . . . . . . .
On Hill and Mountain Roads 4-38 . . . . . . . . . . . . . . . . . . . .
On Snow and Ice 4-40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .