GMC SIERRA 1999 Owner's Manual

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8-7
Trip Interruption Assistance: GMC will reimburse any
reasonable trip interruption expenses (up to $500.00)
when directly associated with warranty disablement. Trip
Interruption service covers expenses such as meals and
overnight lodging if vehicle disablement occurs at least
150 miles (240 km) from your home or rental property.
Please Note: you will be required to obtain prior
approval from GMC Roadside Assistance and pay for
expenses at the time of disablement. Original receipts
should be submitted to GMC Roadside Assistance for
reimbursement. A service representative will provide
assistance when you call.
The Roadside Assistance services listed are available
to retail and retail lease customers operating 1999 GMC
light duty trucks for a period of 3 years/36,000 miles
(60 000 km). All services must be pre
-arranged by
GMC Roadside Assistance.
Over
-the-phone assistance, such as providing the name
of the closest dealer or minor technical advice, etc., is
available to all owner/operators of GMC trucks,
regardless of vehicle or mileage.
Just dial GMC Roadside Assistance at
1
-800-GMC-8782 (1-800-462-8782, Roadside
Assistance prompt) to reach a qualified representative
who can assist you.Your Roadside Assistance representative will ask for the
following information when your call is received:

Vehicle Identification Number (VIN)

Name and home address

Telephone number and location from which you
are calling

Location, license plate number and color of your
GMC truck

Mileage of vehicle and description of problem
Roadside Assistance is available 24 hours a day, 7 days
a week, 365 days a year, including weekends and
holidays. Should you have any questions about roadside
assistance, call the GMC Roadside Assistance Center or
contact your dealer.
Roadside Assistance is not part of or included in the
coverage provided by the New Vehicle Limited Warranty.
GMC reserves the right to make any changes or
discontinue the Roadside Assistance program at any
time without notification.
Canadian Roadside Assistance
Vehicles purchased in Canada have an extensive
Roadside Assistance program accessible from anywhere
in Canada or the United States. Please refer to the
separate brochure provided by the dealer or call
1
-800-268-6800 for emergency services.

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8-8
Courtesy Transportation
GMC has always exemplified quality and value in its
offering of motor vehicles. To enhance your ownership
experience, we and our participating dealerships are
proud to offer Courtesy Transportation, a customer
support program for new vehicles.
The Courtesy Transportation program is offered to retail
purchase/lease customers in conjunction with the
Bumper to Bumper coverage provided by the New
Vehicle Limited Warranty. Several transportation
options are available when warranty repairs are
required. This will reduce your inconvenience during
warranty repairs.
Plan Ahead When Possible
When your vehicle requires warranty service, you
should contact your dealer and request an appointment.
By scheduling a service appointment and advising your
service consultant of your transportation needs, your
dealer can help minimize your inconvenience. If it is
determined that your vehicle cannot be scheduled into
the service department immediately and is still
operative, you are encouraged to drive the vehicle until
scheduling can be accomplished.If the dealer requests that you simply drop the vehicle
off for service, you are urged to do so as early in the
work day as possible to allow for same day repair.
Transportation Options
Warranty service can generally be completed while you
wait. However, if you are unable to wait GMC helps
minimize your inconvenience by providing several
transportation options. Depending on the circumstances,
your dealer can offer you one of the following:
Shuttle Service
Participating dealerships can provide you with shuttle service
to get you to your destination with minimal interruption of
your daily schedule. This includes a one way shuttle ride to a
destination up to 10 miles from the dealership.
Public Transportation or Fuel Reimbursement
If your vehicle requires overnight warranty repairs,
reimbursement up to $30 per day (five days maximum)
may be available for the use of public transportation
such as taxi or bus. In addition, should you arrange
transportation through a friend or relative,
reimbursement for reasonable fuel expenses up to
$10 per day (five day maximum) may be available.
Claim amounts should reflect actual costs and be
supported by original receipts.

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Courtesy Rental Vehicle
When your vehicle is unavailable due to overnight
warranty repairs, your dealer may arrange to provide
you with a courtesy rental vehicle or reimburse you for a
rental vehicle you obtained, at actual cost, up to a
maximum of $30.00 per day supported by receipts.
This requires that you sign and complete a rental
agreement and meet state, local and rental vehicle
provider requirements. Requirements vary and may
include minimum age requirements, insurance coverage,
credit card, etc. You are responsible for fuel usage
charges and may also be responsible for taxes, levies,
usage fees, excessive mileage or rental usage beyond the
completion of the repair.
Generally it is not possible to provide a like
-vehicle as a
courtesy rental.
Additional Program Information
Courtesy Transportation is available during the
Bumper
-to-Bumper warranty coverage period,
but it is not part of the New Vehicle Limited Warranty.
A separate booklet entitled ªWarranty and Owner
Assistance Informationº furnished with each new
vehicle provides detailed warranty coverage information.Courtesy Transportation is available only at
participating dealerships and all program options, such
as shuttle service, may not be available at every dealer.
Please contact your dealer for specific information about
availability. All Courtesy Transportation arrangements
will be administered by appropriate dealer personnel.
Canadian Vehicles: For warranty repairs during the
Complete Vehicle Coverage period of the General
Motors of Canada New Vehicle Limited Warranty,
alternative transportation may be available under the
Courtesy Transportation Program. Please consult your
dealer for details.
General Motors reserves the right to unilaterally modify,
change or discontinue Courtesy Transportation at any time
and to resolve all questions of claim eligibility pursuant to the
terms and conditions described herein at its sole discretion.
General Motors and participating dealerships reserve the
right to deny a rental vehicle to anyone not possessing a
valid motor vehicle operators license in their name,
anyone who is under the influence of alcohol or drugs, or
anyone whose mental or physical abilities are impaired so
as to be unable to operate a motor vehicle safely.
Warranty Information
Your vehicle comes with a separate warranty booklet
that contains detailed warranty information.

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REPORTING SAFETY DEFECTS
TO THE UNITED STATES
GOVERNMENT
If you believe that your vehicle has a defect which could
cause a crash or could cause injury or death, you should
immediately inform the National Highway Traffic
Safety Administration (NHTSA), in addition to
notifying General Motors.
If NHTSA receives similar complaints, it may open an
investigation, and if it finds that a safety defect exists in
a group of vehicles, it may order a recall and remedy
campaign. However, NHTSA cannot become involved
in individual problems between you, your dealer or
General Motors.
To contact NHTSA, you may either call the Auto Safety
Hotline toll
-free at 1-800-424-9393 (or 366-0123 in the
Washington, D.C. area) or write to:
NHTSA, U.S. Department of Transportation
Washington, D.C. 20590
You can also obtain other information about motor
vehicle safety from the hotline.
REPORTING SAFETY DEFECTS TO
THE CANADIAN GOVERNMENT
If you live in Canada, and you believe that your vehicle
has a safety defect, you should immediately notify
Transport Canada, in addition to notifying General
Motors of Canada Limited. You may write to:
Transport Canada
330 Sparks Street
Tower C
Ottawa, Ontario K1A 0N5

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REPORTING SAFETY DEFECTS
TO GENERAL MOTORS
In addition to notifying NHTSA (or Transport Canada)
in a situation like this, we certainly hope you'll notify
us. Please call us at 1
-800-GMC-8782
(1
-800-462-8782), or write:
Pontiac-GMC Customer Assistance Center
P.O. Box 436008
Pontiac, MI 48343
-6008
In Canada, please call us at 1
-800-263-3777 (English)
or 1
-800-263-7854 (French). Or, write:
General Motors of Canada Limited
Customer Communication Centre, 163-005
1908 Colonel Sam Drive
Oshawa, Ontario L1H 8P7
Ordering Service and Owner
Publications in Canada
Service manuals, owner's manuals and other service
literature are available for purchase for all current and
past model General Motors vehicles.
The toll-free telephone number for ordering information
in Canada is 1-800-668-5539.

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CURRENT PUBLICATIONS FOR 1999 GMC
SERVICE MANUALS
Service Manuals have the diagnosis and repair information
on engines, transmission, axle, suspension, brakes,
electrical, steering, body, etc.
RETAIL SELL PRICE: $90.00
TRANSMISSION, TRANSAXLE, TRANSFER CASE
UNIT REPAIR MANUAL
This manual provides information on unit repair service
procedures, adjustments and specifications for the
1999 GM transmissions, transaxles and transfer cases.
RETAIL SELL PRICE: $50.00
SERVICE BULLETINS
Service Bulletins give technical service information needed
to knowledgeably service General Motors cars and trucks.
Each bulletin contains instructions to assist in the
diagnosis and service of your vehicle.OWNER'S INFORMATION
Owner publications are written directly for Owners and
intended to provide basic operational information about the
vehicle. The owner's manual will include the Maintenance
Schedule for all models.
In-Portfolio: Includes a Portfolio, Owner's Manual and
Warranty Booklet.
RETAIL SELL PRICE: $20.00
Without Portfolio: Owner's Manual only.
RETAIL SELL PRICE: $15.00
CURRENT & PAST MODEL ORDER FORMS
Service Publications are available for current and past
model GM vehicles. To request an order form, please
specify year and model name of the vehicle.
PLEASE COMPLETE THE ORDER FORM SHOWN ON
THE FOLLOWING PAGE AND MAIL TO:
Helm, Incorporated
P.O. Box 07130
Detroit, MI 48207OR ORDER TOLL FREE: 1-800-551-4123
Monday-Friday 8:00 AM ± 6:00 PM Eastern Time
For Credit Card Orders Only (VISA±MasterCard±Discover)
1999 GMC SERVICE PUBLICATIONS ORDERING INFORMATION
The following publications covering the operation and servicing of your vehicle can be purchased by filling out
the Service Publication Order Form in this book and mailing it in with your check, money order,
or credit card information to Helm, Incorporated (address below.)

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8-13
PUBLICATION FORM
NUMBEROrders will be mailed within 10 days of receipt. Please allow adequate time for postal
service. If further information is needed, write to the address shown below or call
1-800-551-4123. Material cannot be returned for credit without packing slip with return
information within 30 days of delivery. On returns, a re-stocking fee may be applied
against the original order. ORDER TOLL FREE
(NOTE: For Credit Card Holders Only)1-800-551-4123(Monday-Friday 8:00 AM ± 6:00 PM EST)
FAX Orders Only 1-313-865-5927
Service Manual
NOTE: Dealers and Companies please provide dealer or company name, and also the
name of the person to whose attention the shipment should be sent.
Mail completed order form to:
HELM, INCORPORATED
P.O. Box 07130
Detroit, MI 48207
For purchases outside U.S.A. please write to the above address for quotation.
1999$90.00
1999
$50.00
1999
$20.00
1999
$15.00
TOTAL MATERIAL
Michigan Purchasers
U.S. Order Processing$6.00
Canadian Postage
GRAND TOTAL
add 6% sales tax
(See Note Below)
GM-GMC-ORD99 *(Prices are subject to change without notice and without incurring
obligation. Allow ample time for delivery.)Note to Canadian Customers: All listed prices are quoted in U.S. funds. Canadian residents
are to make checks payable in U.S. funds. To cover Canadian postage, add $11.50 plus the
U.S. order processing.
(CUSTOMER'S NAME) (ATTENTION)
(STREET ADDRESSÐNO P.O. BOX NUMBERS)
(CITY) (ZIP CODE)
DAYTIME TELEPHONE NO.(STATE)
AREA CODE
( )P
Check or Money
Order payable to
Helm, Inc. (USA funds
only Ð
do not send cash.)
VISA
Discover
Account
Number:
Expiration
Date mo/yr:
CUSTOMER SIGNATURE
S
ITEM DESCRIPTIONNAME YEAR VEHICLE MODEL
QTY.PRICE
EACH*TOTAL
PRICE1
9
9
9
G
M
H
I
P

T
OA
Y
M
E
N
T
Owner's Manual Without Portfolio Owner's Manual In Portfolio Car & Light Truck
Transmission Unit Repair
MasterCard
Check here if your billing address
is different from your shipping
address shown.
PUBLICATION FORM
NUMBER

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8-14
-NOTES

9-yellowblue
9-1
Section 9 Index
A
ccessory Power Outlet 2-59 . . . . . . . . . . . . . . . . . . . . . . . . .
Adding Equipment to the Outside of Your Vehicle 6-3 . . . . . .
Air Bag 1-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adding Equipment 1-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How Does it Restrain 1-28 . . . . . . . . . . . . . . . . . . . . . . . . . .
How it Works 1-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Location 1-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Off Light 2-65 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Off Switch 1-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Readiness Light 1-25, 2-65 . . . . . . . . . . . . . . . . . . . . . . . . .
Servicing 1-33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What Makes it Inflate 1-27 . . . . . . . . . . . . . . . . . . . . . . . . . .
What Will You See After it Inflates 1-28 . . . . . . . . . . . . . . .
When Should it Inflate 1-27 . . . . . . . . . . . . . . . . . . . . . . . . .
Air Cleaner 6-17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Cleaner Filter Restriction Indicator Check 7-42 . . . . . . . .
Air Conditioning 3-3, 3-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Conditioning Refrigerants 6-78 . . . . . . . . . . . . . . . . . . . . .
Alignment and Balance, Tire 6-58 . . . . . . . . . . . . . . . . . . . . . .
Aluminum Wheels, Cleaning 6-66 . . . . . . . . . . . . . . . . . . . . . .
Antenna 3-27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Antifreeze 6-28, 6-76, 7-48 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Anti-Lock
Brake System Warning Light 2-68, 4-7 . . . . . . . . . . . . . . . .
Brakes 4-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Appearance Care 6
-61 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appearance Materials, GM Vehicle Care/ 6-68 . . . . . . . . . . . .
Arbitration Program 8-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Armrest Storage Compartment 2-56 . . . . . . . . . . . . . . . . . . . .
Ashtrays 2-57 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audio Equipment, Adding 3-25 . . . . . . . . . . . . . . . . . . . . . . . .
Audio Systems 3-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Transmission
Check 7
-42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid 6-20, 7-49 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Park Mechanism Check 7-45 . . . . . . . . . . . . . . . . . . . . . . . .
Starting Your Engine 2-13 . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation 2-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Axle, Front 6-27, 7-49 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Axle, Locking Rear 2-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Axle, Rear 6-25, 7-49 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery 6-38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jump Starting 5-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement, Keyless Entry 2-8 . . . . . . . . . . . . . . . . . . . . .
Warnings 5-3, 5-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BBB Auto Line 8-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Better Business Bureau Mediation 8-4 . . . . . . . . . . . . . . . . . . .
Blizzard, Driving In 4-38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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9-2
Brake
Adjustment 6-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid 6-34, 7-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Master Cylinder 6-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parking 2-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pedal Travel 6-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacing System Parts 6-38 . . . . . . . . . . . . . . . . . . . . . . . .
System Warning Light 2-68 . . . . . . . . . . . . . . . . . . . . . . . . .
Trailer 4-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission Shift Interlock Check 7-44 . . . . . . . . . . . . . . .
Wear 6-36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brakes, Anti-Lock 4-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Braking 4-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Braking in Emergencies 4-8 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Break-In, New Vehicle 2-10 . . . . . . . . . . . . . . . . . . . . . . . . . .
BTSI Check 7-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Bulb Replacement 6-39 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Camper Wiring Harness 4-48 . . . . . . . . . . . . . . . . . . . . . . . .
Camper-Type Mirror 2-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Canadian Roadside Assistance 8-7 . . . . . . . . . . . . . . . . . . . . . .
Capacities and Specifications 6-76 . . . . . . . . . . . . . . . . . . . . . .
Carbon Monoxide 2-31, 4-40 . . . . . . . . . . . . . . . . . . . . . . . . .
Care of Your Cassette Tape Player 3-26 . . . . . . . . . . . . . . . . . .
Cargo Lamp 2-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cassette Deck Service 7-41 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cassette Tape Player 3-10, 3-12 . . . . . . . . . . . . . . . . . . . . . . .
Cassette Tape Player Care 3-26 . . . . . . . . . . . . . . . . . . . . . . . .
Center Overhead Console 2-51 . . . . . . . . . . . . . . . . . . . . . . . .
Center Passenger Position 1-35 . . . . . . . . . . . . . . . . . . . . . . . .
Certification Label 4-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Certification/Tire Label 4
-43 . . . . . . . . . . . . . . . . . . . . . . . . . .
Chains, Safety 4-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chains, Tire 6-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Changing a Flat Tire 5-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charging System Light 2-67 . . . . . . . . . . . . . . . . . . . . . . . . . .
Check Gages Light 2-74 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking Your Restraint Systems 1-71 . . . . . . . . . . . . . . . . . .
Chemical Paint Spotting 6-67 . . . . . . . . . . . . . . . . . . . . . . . . . .
Child Restraints 1-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Securing in a Rear Outside Seat Position 1-54, 1-56 . . . . . .
Securing in the Center Seat Position 1-59 . . . . . . . . . . . . . .
Securing in the Right Front Seat Position 1-62, 1-64 . . . . .
Top Strap 1-53 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Where to Put 1-52, 1-53 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chrome Wheels, Cleaning 6-68 . . . . . . . . . . . . . . . . . . . . . . . .
Cigarette Lighter 2-58 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Breakers and Fuses 6-70 . . . . . . . . . . . . . . . . . . . . . . .
Cleaner/Filter, Air 6-17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning
Aluminum Wheels 6
-66 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exterior Lamps/Lenses 6-65 . . . . . . . . . . . . . . . . . . . . . . . .
Fabric 6-61 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glass 6-64 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inside of Your Vehicle 6-61 . . . . . . . . . . . . . . . . . . . . . . . . .
Instrument Panel 6-63 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interior Plastic Components 6-63 . . . . . . . . . . . . . . . . . . . . .
Leather 6-63 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Outside of Your Vehicle 6-65 . . . . . . . . . . . . . . . . . . . . . . . .
Special Problems 6-62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stains 6-62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tires 6-67 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vinyl 6-63 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .