1999 GMC C Series Owners Manual

1-800-551-4123

(Monday-Friday 8:00 AM – 6:00 PM EST)

FAX Orders Only 1-313-865-5927

Orders 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.

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PUBLICATION FORM PUBLICATION FORM

NUMBER NUMBER

ITEM DESCRIPTION

Service Manual Car & Light Truck Transmission Unit Repair

Owner’s Manual In Portfolio

Owner’s Manual Without Portfolio

VEHICLE MODEL

NAME

TOTAL PRICE

QTY.

YEAR 1999

1999

1999

1999

PRICE EACH*

$90.00

$50.00

$15.00

$10.00

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 S P.O. Box 07130 S Detroit, MI 48207
For purchases outside U.S.A. please write to the above address for quotation.

(CUSTOMER’S NAME)

(ATTENTION)

(STREET ADDRESS—NO P.O. BOX NUMBERS)

(CITY)

(STATE)

DAYTIME TELEPHONE NO.

( )

AREA CODE

(ZIP CODE)

Check or Money Order payable to Helm, Inc. (USA funds only — do not send cash.)

MasterCard

VISA

Discover

Account Number: Expiration Date mo/yr:

CUSTOMER SIGNATURE

TOTAL MATERIAL

Michigan Purchasers add 6% sales tax

U.S. Order Processing

Canadian Postage (See Note Below)

GRAND TOTAL

$5.00

Check here if your billing address is different from your shipping address shown.

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 8-9
are to make checks payable in U.S. funds. To cover Canadian postage, add $11.50 plus the U.S. order processing.

- NOTES

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8-10

Section 9 Index

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. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Air Brake System Warning Light Cleaner Cleaner Filter Compressor Filter Conditioning Conditioning Refrigerants Dryer Filter Restriction Indicator Suspension

Air Brake Systems

Air Dryer Alcohol Injector Moisture Ejector

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Alcohol Injector Alignment and Balance, Tire AM-FM Stereo AM-FM Stereo with Remote Cassette Tape Player Antenna Antifreeze Anti-Lock Brakes Brake System Warning Light

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Appearance Care Appearance Care Materials 9-

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-59
6-17
6-77
6-77
3-5, 6-77
6-77
6-34
6-17
2-19
6-33
6-34
6-34
6-33
6-34
6-51
3-8
3-10
3-12
6-23
4-7
2-61, 4-7
6-59
6-66

Apply Park Brake Warning Light Ashtray Audio Systems Automatic Transmission Fluid Automatic Transmission Shift Indicator Check Auxiliary Power Jacks Axle, Rear

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Airshift Control Differential Lock Control Fluid Capacity Shift Motor Two-Speed Electric Shift Control Towing Battery Battery, Jump Starting Brake

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Adjustment Air Brake Systems Air Parking Brake Electric/Hydraulic Parking Brake Electric/Hydraulic Parking Brake Fluid Exhaust Fluid

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-60
2-47
3-7
6-18
7-25
2-48
6-20
2-19
2-41
6-76
6-20
2-17
5-15

6-42
5-5
6-33
6-33
2-26
2-25
6-36
2-16
6-30

9-1

Brake (Continued)

Four-Wheel and Six-Wheel Drum Four-Wheel Disc Hydraulic Systems Master Cylinder Parking Pedal Travel Propshaft Brake Burnish Procedure Releasing Air-Operated Parking Brakes Replacing System Parts System Check System Warning Lights

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6-33
6-32
4-7
6-30
2-23
6-33
2-24
5-15
6-35
7-25
2-57
4-7
4-6
4-9
2-5

Brake, Anti-Lock Braking Braking in Emergencies Break-In, New Vehicle Capacities and Specifications Carbon Monoxide Cassette Tape Player Care Center Passenger Position Certification/Tire Label Changing a Flat Tire Charging System Light Chassis Lubrication Check Gages Light Checking Your Restraint Systems Chemical Paint Spotting

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6-74
2-29, 2-30 , 4-27
3-12
1-22
4-28, 6-67
5-34
2-56
6-37
2-67
1-36
6-65

9-2

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Child Restraints

Securing in the Center Seat Position Top Strap

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cigarette Lighter Circuit Breaker Block, Instrument Panel Cleaner, Air Cleaning Fabric Glass Inside of Your Vehicle Instrument Panel Outside of Your Vehicle Safety Belts Special Problems Tires Vinyl Windshield and Wiper Blades

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Clock, Setting the Clutch Pedal Free Travel Comfort Controls Component Box Connections, Trailer Control of a Vehicle Coolant

Heater, Engine Recovery Tank Surge Tank

1-26
1-31
1-30
2-47
6-69
6-17
6-59
6-62
6-59
6-61
6-63
6-61
6-60
6-64
6-61
6-62
3-7
6-37
3-2
6-44
2-49
4-6
6-23
2-15
5-22
5-29

Cooling System

6-74
5-27, 6-25
5-20, 6-23
6-74
2-36
8-3
8-1
8-2

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Capacity Diesel Engines Gasoline Engines Crankcase Capacity Cruise Control Customer Assistance for Text Telephone Users Customer Assistance Information Customer Satisfaction Procedure Damage Finish Sheet Metal

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Daytime Running Lamps Daytime Running Lamps Indicator Light Defects, Reporting Safety Defensive Driving Defogging Diesel Engine Exhaust Brake Diff Lock Indicator Light Do Not Shift Light Dome Lamps Door

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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6-65
6-64
2-44
2-67
8-6, 8-7
4-2
3-6
2-16
2-63
2-57
2-46
7-27
2-4
2-4
1-11
4-19
4-2

Latches Check Locks Power Locks Driver Position Driving City Defensive

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Drunken Freeway In a Blizzard In Rain and on Wet Roads Night On Curves On Hill and Mountain Roads On Snow and Ice Through Water Winter

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-3
4-20
4-26
4-16
4-15
4-10
4-22
4-24
4-18
4-24
4-3

Drunken Driving Electrical Equipment, Adding Electrical System Engine

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Air Cleaner Filter Air Control Automatic Shutdown Coolant (CaterpillarR Diesel Engine) Coolant (Gasoline Engine) Coolant Heater Coolant Level Check Coolant Temperature Gage Cooling System Capacity Crankcase Capacity Diesel,Warm-Up Exhaust Fan Breakage Fan Noise Fast Idle System

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6-68
6-68
6-77
2-42
2-11
6-27
6-23
2-15
7-23
2-62
6-74
6-74
2-11
2-29, 2-30, 4-27
6-3
5-33
2-12
9-3

Engine (Continued)

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fuse Blocks Identification Oil Oil Filters and PCV Valves Oil Level Check Overheating Road Speed Governor Running While Parked Specifications Starter Over-Crank Protection Starting Engine Oil Additives Checking Diesel Engines Filters Oil Life Monitor Pressure Gage Used What Kind to Use When to Add When to Change

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6-69, 6-72
6-67
6-13, 6-17
6-77
7-23
5-18
2-54
2-30
6-74
2-7
2-7, 2-10
6-13, 6-17
6-16
6-13
6-17
6-77
6-16
2-66
6-16
6-14
6-14
6-16
6-46
2-16
2-29, 2-30, 4-27
7-26

Ether Injection System Exhaust Brake Engine System Check

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9-4

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fabric Cleaning Filling a Portable Fuel Container Filling Your Tank Filter

Air Cleaner Air Compressor Engine Oil

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Filterminder Gage Finish Care Finish Damage Flashers, Hazard Warning Flat Tire, Changing Fluid Leaks Check Fluids and Lubricants Footnotes French Language Manual Front Towing Front Wheel Bearings with Oil-Filled Hubs Fuel

6-59
6-8
6-7
6-77
6-77
6-77
2-70
6-63
6-65
5-2
5-34
7-27
7-28
7-18
. . . . . . . . . . . . . . . . . . . . . . . . . . . ii 5-10, 5-14
6-47
6-5
6-8
6-7
6-44, 6-77
2-68
6-4
6-76
6-5
6-6
6-69
6-68

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Fuels in Foreign Countries -- Gasoline Fuses and Circuit Breakers Fusible Links

Diesel Engine Filling a Portable Container Filling Your Tank Filter Gage Gasoline Engine Tank Capacity Water in Fuel

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . .

Gages Air Pressure Engine Coolant Temperature Engine Oil Pressure Filterminder Fuel Hourmeter Oil Pressure Speedometer Tachometer Transmission Temperature Voltmeter

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-69
2-61
2-65
2-70
2-68
2-70
2-65
2-53
2-54
2-69
2-56
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii

Guide en Français Hazard Warning Flasher Switch Hazard Warning Flashers Head Restraints Headlamps

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

High/Low Beam Changer Wiring

Heating Highway Hypnosis Hill and Mountain Roads Hood

Access Panels Checking Things Under Latches Check

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Horn

5-3
5-2
1-3
2-43
2-34
6-68
3-5
4-21
4-22
6-10
6-9
7-27
2-31

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Hourmeter Gage Hydraulic Brake Warning Light Hydroplaning Ignition Positions Inflation, Tire Inspections

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Instrument Panel

Engine Cover Check Underbody

Circuit Breaker Block Cleaning Cluster

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Intake Heater Indicator Light Inter-Axle Differential Lock Control Jump Starting Keys Labels Certification/Tire Service Parts Identification Vehicle Identification Number

. . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lamp and Bulb Data Lamp Check

4-28, 6-67
6-67
6-67
6-74
7-26

2-70
2-58
4-18

2-6
6-49
7-27
7-27
2-50
6-69
6-61
2-52
2-63
2-40

5-5

2-2

9-5

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Locks

Door Power Door

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lubricants and Fluids Lubrication Service, Body Maintenance Record Owner Checks and Services Recommended Fluids and Lubricants Scheduled Maintenance Services

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maintenance, Underbody Malfunction Indicator Lamp Manual Fast Idle Indicator Light Manual Transmission Fluid Marker and Clearance Lamps Maxi-Fuse Block Mirrors

Convex Outside Heated Outside Inside Rearview Outside

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model Reference Moisture Ejector Mountain Roads Muffler/Catalytic Converter Assembly Multifunction Lever

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-4
2-4
7-28
7-24

7-31
7-23
7-28
7-4
6-65
2-64
2-62
6-19
2-45
6-72
2-46
2-47
2-46
2-46
vi 6-33
4-22
6-48
2-32

Lamps

Dome On Reminder

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Latches, Seatback Leaving Your Vehicle Lighter Lights

. . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . .

Air Brake System Warning Anti-Lock Brake System Warning Apply Park Brake Warning Brake System Warning Charging System Indicator Check Gages Indicator Daytime Running Lamps Indicator Diff Lock Indicator Do Not Shift Warning Hydraulic Brake System Warning Intake Heater Indicator Lamp and Bulb Data Low Coolant Warning Parking Brake Warning Parking Brake Indicator Safety Belt Reminder Service Park Brake Warning Service Trans Filter Indicator Manual Fast Idle Indicator Light

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . .

Loading Your Vehicle

2-43
2-46
2-44
1-3
2-5
2-47
2-59
2-61, 4-7
2-60
2-57
2-56
2-67
2-67
2-63
2-57
2-58
2-63
6-74
2-62
2-60
2-60
1-7, 2-55
2-60
2-64
2-62
4-28

9-6

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-5
4-15
6-11

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-53
4-12
6-13, 6-17
7-23
8-9
8-8

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . .

New Vehicle “Break-In” Night Vision Noise Control System Odometer Off-Road Recovery Oil, Engine Owner Checks and Services Owner Publications Order Form Owner Publications, Ordering Paint Spotting, Chemical Parking Brake Brake Check Brake Indicator Light Over Things That Burn

Passing Power

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Door Locks Option Fuses Steering Steering Fluid Windows

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Power Take-Off (PTO) Pregnancy, Use of Safety Belts Pressure Caps Problems on the Road Publications, Service and Owner

6-65
2-24
7-24
2-60
2-29
4-12
2-4
6-69
4-9
6-28
2-31
4-31
1-21
6-77
5-1
8-8

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Radiator Radiator Pressure Cap Radiator Shutters Radio Reception Rear Axle

Airshift Control Differential Lock Control Fluid Capacity Shift Motor Two-Speed Electric Shift Control Towing

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Recovery Tank, Coolant Refrigerants, Air Conditioning Releasing Air Operated Parking Brake Remote Cassette Tape Player Replacement Wheels Replacing Safety Belts Reporting Safety Defects Restraints

. . . . . . . . . . . . . . . . . . . . . .

Checking Child Head Replacing Parts After a Crash System Check

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Right Passenger Position Roadside Assistance Rocking Your Vehicle

5-25
6-21
2-13
3-10
6-20
2-19
2-41
6-76
6-20
2-17
5-15
5-22
6-77
5-15
3-10
6-57
1-36
8-6, 8-7
1-36
1-26
1-3
1-36
7-24
1-21
8-5
5-38

9-7

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Safety Belts Adults Care Center Passenger Position Children Driver Position Extender How to Wear Properly Lap Belt Lap-Shoulder Belt Larger Children Questions and Answers Reminder Light Replacing After a Crash Right Passenger Position Smaller Children and Babies Use During Pregnancy Why They Work

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . .

Safety Defects, Reporting Safety Warnings and Symbols Scheduled Maintenance Scheduled Maintenance Services Seat Adjuster Check Seatback Latches Seats

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Bucket and Bench Chugger-Snubber Lock-Out Controls Cushion Adjustment Fore-and-Aft Adjustment

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-6
1-11
6-61
1-22
1-23
1-11
1-36
1-11
1-22
1-12
1-33
1-10
1-7, 2-55
1-36
1-21
1-23
1-21
1-8
8-6, 8-7
iii 7-5
7-4
7-26
1-3
1-2
1-6
1-2
1-5
1-5

9-8

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Securing a Child Restraint Service

Height Adjustment Lumbar Adjustments National

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Bulletins, Ordering Manuals, Ordering Park Brake Warning Light Parts Identification Label Publications, Ordering Trans Filter Indicator Light Work, Doing Your Own

Service and Appearance Care Service and Owner Publications Sheet Metal Damage Signal-Stat Turn Signal Skidding Specifications, Engine Speedometer Starter Switch Check Starting Your Diesel Engine Starting Your Gasoline Engine Steam Steering Check In Emergencies Power Tips Wheel, Tilt

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-4
1-5
1-4
1-31
6-2
8-8
8-8
2-60
6-67
8-8
2-64
6-3
6-1
8-8
6-64
2-33, 5-4
4-14
6-74
2-53
7-25
2-10
2-7
5-18
4-9
7-25
4-11
4-9
4-10
2-31

. . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6-42
5-37
2-48
5-29
6-22
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage, Vehicle Stuck: In Sand, Mud, Ice or Snow Sun Visors Surge Tank, Coolant Surge Tank Pressure Cap Symbols, Vehicle Tape Player Care Theft Thermostat Tilt Steering Wheel Tire Loading Tires

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Changing a Flat Cleaning Dual Tire Operation Inflation Inflation Check Loading Pressure Rims and Wheels Wheel Replacement When It’s Time for New

3-12
2-5
6-22
2-31
6-48
6-48
5-34
6-64
6-50
6-49
7-23
6-48
6-49
6-50
6-57
6-51
1-30
6-52 , 6-74
5-9

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . .

Top Strap Torque, Wheel Nut Towing Your Vehicle

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-39
2-49
2-20, 6-18
6-19
2-22
6-77
6-18
6-75
2-22, 6-19
6-19
2-21
2-22
6-18
6-19
8-3
2-33

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Trailer Brake Hand Control Valve Trailer Connections Transmission Automatic Automatic Transmission External Filter Double-Clutching Filters Fluid, Automatic Fluid Capacity Manual Manual, Fluid Third Gear Hold Using the Clutch Automatic Manual TTY Users Turn and Lane Change Indicator Underbody Maintenance Vehicle Control Damage Warnings Identification Number Loading Storage

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Ventilation System Visors, Sun Voltmeter

. . . . . . . . . . . . . . . . . . . . . . . .

6-65

4-6
iv 6-67
4-28
6-42
3-6
2-48
2-56

9-9

Warning Devices Warning Lights and Gages Warranty Information Washer Fluid, Windshield Washing Your Vehicle Weatherstrips Wheel

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Alignment Nut Torque Replacement Tightening the Wheel Nuts

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Windows Manual Power

5-4
2-55
8-5
2-35, 6-29
6-63
6-62
6-51
6-52, 6-74
6-57
6-52
2-30
2-30
2-31

Windshield Washer

Fluid Fluid Level Check

Windshield Wipers Blade Cleaning Blade Replacement Fuses Low Speed Delay

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Winter Driving Wiper Blade Check Wiring, Headlamp

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2-35
7-23
2-35
6-62
6-43
6-68
2-35
4-24
7-24
6-68

9-10

The 1999 GMC C-Series Owner’s Manual

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1-1

2-1

3-1

4-1

5-1

6-1

7-1

8-1

9-1

Seats and Restraint Systems This section tells you how to use your seats and safety belts properly. Features and Controls This section explains how to start and operate your vehicle. Comfort Controls and Audio Systems This section tells you how to adjust the ventilation and comfort controls and how to operate your audio system. Your Driving and the Road Here you’ll find helpful information and tips about the road and how to drive under different conditions. Problems on the Road This section tells you what to do if you have a problem while driving, such as a flat tire or overheated engine, etc. Service and Appearance Care Here the manual tells you how to keep your vehicle running properly and looking good. Maintenance Schedule This section tells you when to perform vehicle maintenance and what fluids and lubricants to use. Customer Assistance Information This section tells you how to contact GMC for assistance and how to get service and owner publications. It also gives you information on “Reporting Safety Defects” on page 8-6. Index Here’s an alphabetical listing of almost every subject in this manual. You can use it to quickly find something you want to read.

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We support voluntary technician certification.

GENERAL MOTORS, GM, the GM Emblem, GMC and the GMC Emblem are registered trademarks of General Motors Corporation. This manual includes the latest information at the time it was printed. We reserve the right to make changes in the product after that time without further notice. For vehicles first sold in Canada, substitute the name “General Motors of Canada Limited” for GM Medium Duty Truck Division whenever it appears in this manual. Please keep this manual in your vehicle, so it will be there if you ever need it when you’re on the road. If you sell the vehicle, please leave this manual in it so the new owner can use it.

Litho in U.S.A. X9902 A First Edition

ii

For Canadian Owners Who Prefer a French Language Manual: Aux propriétaires canadiens: Vous pouvez vous procurer un exemplaire de ce guide en français chez votre concessionaire ou au:

DGN Marketing Services Ltd. 1577 Meyerside Dr. Mississauga, Ontario L5T 1B9

ECopyright General Motors Corporation 1998
All Rights Reserved

How to Use this Manual Many people read their owner’s manual from beginning to end when they first receive their new vehicle. If you do this, it will help you learn about the features and controls for your vehicle. In this manual, you’ll find that pictures and words work together to explain things quickly. Index A good place to look for what you need is the Index in back of the manual. It’s an alphabetical list of what’s in the manual, and the page number where you’ll find it. Safety Warnings and Symbols You will find a number of safety cautions in this book. We use a box and the word CAUTION to tell you about things that could hurt you if you were to ignore the warning.

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CAUTION:

These mean there is something that could hurt you or other people.

In the caution area, we tell you what the hazard is. Then we tell you what to do to help avoid or reduce the hazard. Please read these cautions. If you don’t, you or others could be hurt.

You will also find a circle with a slash through it in this book. This safety symbol means “Don’t,” “Don’t do this” or “Don’t let this happen.”

iii

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Vehicle Damage Warnings Also, in this book you will find these notices:

NOTICE:

These mean there is something that could damage your vehicle.

In the notice area, we tell you about something that can damage your vehicle. Many times, this damage would not be covered by your warranty, and it could be costly. But the notice will tell you what to do to help avoid the damage. When you read other manuals, you might see CAUTION and NOTICE warnings in different colors or in different words. You’ll also see warning labels on your vehicle. They use the same words, CAUTION or NOTICE.

iv

Vehicle Symbols These are some of the symbols you may find on your vehicle.

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These symbols have to do with your lamps:

These symbols are on some of your controls:

These symbols are used on warning and indicator lights:

Here are some other symbols you may see:

For example, these symbols are used on an original battery:

CAUTION POSSIBLE INJURY

PROTECT EYES BY SHIELDING

CAUSTIC BATTERY ACID COULD CAUSE BURNS

AVOID SPARKS OR FLAMES

SPARK OR FLAME COULD EXPLODE BATTERY

These symbols are important for you and your passengers whenever your vehicle is driven:

DOOR LOCK UNLOCK

FASTEN SEAT BELTS

POWER WINDOW

MASTER LIGHTING SWITCH

TURN SIGNALS

PARKING LAMPS

HAZARD WARNING FLASHER

DAYTIME RUNNING LAMPS

AIR BAG

FOG LAMPS

WINDSHIELD WIPER

WINDSHIELD WASHER

WINDSHIELD DEFROSTER

REAR WINDOW DEFOGGER

VENTILATING FAN

ENGINE COOLANT TEMP

BATTERY CHARGING SYSTEM

BRAKE

FUSE

LIGHTER

HORN

COOLANT

SPEAKER

ENGINE OIL PRESSURE

ANTI-LOCK BRAKES

FUEL

Model Reference This manual contains information which covers conventional cab models as shown. Most models are unfinished from the factory.

C6H042

C7H042

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C7H064

Since C-Series models delivered from the factory are finished in a variety of ways by a number of companies, you’ll probably find other manuals in your finished vehicle. These manuals are put there by the companies that have added components or equipment to the C-Series model. Read all these materials -- as well as this manual -- carefully, to get all of the information on your vehicle.

vi

Section 1 Seats and Restraint Systems

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Here you’ll find information about the seats in your vehicle and how to use your safety belts properly. You can also learn about some things you should not do with safety belts.

1-2
1-6
1-10

1-11
1-11
1-21
1-21

Seats and Seat Controls Safety Belts: They’re for Everyone Here are Questions Many People Ask About Safety Belts -- and the Answers How to Wear Safety Belts Properly Driver Position Safety Belt Use During Pregnancy Right Passenger Position

1-22
1-23
1-26
1-33
1-36
1-36
1-36

Center Passenger Position Children Child Restraints Larger Children Safety Belt Extender Checking Your Restraint Systems Replacing Restraint System Parts After a Crash

1-

1-1

Seats and Seat Controls This section tells you about the seats in your vehicle and how to adjust them.

Bucket and Bench Seats

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CAUTION:

You can lose control of the vehicle if you try to adjust the seat while the vehicle is moving. The sudden movement could startle and confuse you, or make you push a pedal when you don’t want to. Adjust the driver’s seat only when the vehicle is not moving.

1-2

If your vehicle has a bucket or bench seat, you can adjust it with this lever at the front of the seat. Slide the lever toward the outer seat support to unlock it. Slide the seat to where you want it. Then, release the lever and try to move the seat with your body to make sure the seat is locked into place.

Head Restraints Some seats have adjustable head restraints. Slide an adjustable head restraint up or down so that the top of the restraint is closest to the top of your ears. This position reduces the chance of a neck injury in a crash. Seatback Latches The front of the full-width bench seat seatback folds forward to let you reach the rear of the cab. Bucket seats have outboard-mounted levers to tilt the seatbacks forward or rearward. Your seatback will move back and forth freely unless you come to a sudden stop -- then it will lock into place. If your vehicle is parked going down a fairly steep hill, the seatback may not fold without some help from you.

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To fold the seatback forward, push the seatback toward the rear of the vehicle as you lift this latch. The latch must be down for the seat to work properly.

Bench Seat Shown

CAUTION:

If the seatback isn’t locked, it could move forward in a sudden stop or crash. That could cause injury to the person sitting there. Always press rearward on the seatback to be sure it is locked.

1-3

National Seats (If Equipped)

Height Adjustment

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To adjust the height of a self-contained seat (hand-pumped air seat), push the seat height adjustment pump lever, located on the lower outboard side, down and continue pumping to raise the seat. Press the lever and hold it to lower the seat.

If your vehicle has the low-back National seat, there are six ways you can adjust the seat. If your vehicle has the high-back National seat, there are five ways you can adjust the seat.

To adjust the height of air-sourced seats, use the knob on the front left-hand side on the seat. Push the knob to inflate. Pull the knob to deflate.

1-4

Lumbar Adjustments

To adjust the height of the cushion, lift the cushion height adjustment handle up and forward. You can choose between two settings. The handle is located underneath the seat, in the front.

To get more support in the lumbar area of your back, turn the lumbar adjustment knob. The knob is located on the upper cushion, on the inboard side of the driver’s seat and the outboard side of the passenger’s seat.

Seatback Adjustment

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To tilt the seatback, turn the backrest tilt knob. The knob is located on the lower cushion, on the outboard side of the driver’s seat and the inboard side of the passenger’s seat.

Fore-and-Aft Adjustment

To slide the seat forward or backward, move the lever toward the passenger’s side. The seat will lock in at 1/2 inch (1.5 cm) increments. The lever is located underneath the seat, in the front.

1-5

Chugger-Snubber Lock-Out Feature (If Equipped)

This handle is located on the lower outboard side of the driver’s seat and the inboard side of the passenger’s seat. Move the handle down to isolate any backslap experienced while in tractor/trailer operation or while operating a dump truck application. This is only available on low-back seats.

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Safety Belts: They’re for Everyone This part of the manual tells you how to use safety belts properly. It also tells you some things you should not do with safety belts.

CAUTION:

Don’t let anyone ride where he or she can’t wear a safety belt properly. If you are in a crash and you’re not wearing a safety belt, your injuries can be much worse. You can hit things inside the vehicle or be ejected from it. You can be seriously injured or killed. In the same crash, you might not be if you are buckled up. Always fasten your safety belt, and check that your passengers’ belts are fastened properly too.

1-6

CAUTION:

It is extremely dangerous to ride in a cargo area, inside or outside of a vehicle. In a collision, people riding in these areas are more likely to be seriously injured or killed. Do not allow people to ride in any area of your vehicle that is not equipped with seats and safety belts. Be sure everyone in your vehicle is in a seat and using a safety belt properly.

If your vehicle has a safety belt reminder light, a light comes on as a reminder to buckle up. (See “Safety Belt Reminder Light” in the Index.)

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If your vehicle has a safety belt reminder tone, a tone comes on as a reminder to buckle up. See “Safety Belt Reminder Tone” in the Index. In most states and Canadian provinces, the law says to wear safety belts. Here’s why: They work. You never know if you’ll be in a crash. If you do have a crash, you don’t know if it will be a bad one. A few crashes are mild, and some crashes can be so serious that even buckled up a person wouldn’t survive. But most crashes are in between. In many of them, people who buckle up can survive and sometimes walk away. Without belts they could have been badly hurt or killed. After more than 30 years of safety belts in vehicles, the facts are clear. In most crashes buckling up does matter ... a lot!

1-7

Why Safety Belts Work Q: Aren’t safety belts for kids? A: Yes. And they’re for adult truckers, and anyone

else who rides in your vehicle.

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If the vehicle hits something, it stops -- right then. But nothing stops the people. They keep moving.

Here’s why: when your vehicle goes, say, 30 mph (50 km/h), so do you and your passengers.

1-8

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Then something will stop them. It could be the windshield.

Or it could be the instrument panel. Now, what if you and your passengers were to give that big vehicle a chance to deal with the force of the impact, instead of you?

1-9

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Here Are Questions Many People Ask About Safety Belts -- and the Answers Q: Won’t I be trapped in the vehicle after an

accident if I’m wearing a safety belt?

A: You could be -- whether you’re wearing a safety belt or not. But you can unbuckle a safety belt, even if you’re upside down. And your chance of being conscious during and after an accident, so you can unbuckle and get out, is much greater if you are belted.

Q: If my vehicle has air bags, why should I have to

wear safety belts?

A: Air bags are in many vehicles today and will be

in most of them in the future. But they are supplemental systems only; so they work with safety belts -- not instead of them. Every air bag system ever offered for sale has required the use of safety belts. Even if you’re in a vehicle that has air bags, you still have to buckle up to get the most protection. That’s true not only in frontal collisions, but especially in side and other collisions.