1999 GMC SIERRA trailer

Scheduled Maintenance
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7-6
Short Trip/City Intervals -- Gasoline Engines
Every 60,000 Miles (100 000 km): Engine Accessory
Drive Belt Inspection. Fuel Tank, Cap and Lines
Inspection. Exhaust Gas Recirculation System
Inspection. Evaporative Control System Inspection.
Every 100,000 Miles (166 000 km): Spark Plug Wire
Inspection. Spark Plug Replacement. Automatic
Transmission Service (normal conditions). Positive
Crankcase Ventilation (PCV) Valve Inspection.
Every 150,000 Miles (240 000 km): Cooling System
Service (or every 60 months, whichever occurs first).
These intervals only summarize maintenance services.
Be sure to follow the complete scheduled maintenance
on the following pages.
Long Trip/Highway Definition -- Gasoline Engines
Follow this scheduled maintenance only if none of the
conditions from the Short Trip/City Scheduled
Maintenance is true. Do not use this schedule if the
vehicle is used for trailer towing, driven in a dusty area
or used off paved roads. Use the Short Trip/City
schedule for these conditions.
Driving a vehicle with a fully warmed engine under
highway conditions causes engine oil to break
down slower.

Short Trip/City Scheduled Maintenance -- Gasoline Engines
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7-9
** Drive axle service (see ªRecommended Fluids and
Lubricantsº in the Index for proper lubricant to use):

Check fluid level and add fluid as needed. If driving
in dusty areas or when towing a trailer, drain fluid
and refill every 15,000 miles (25 000 km).

If your vehicle has a locking differential, drain fluid
and refill at first engine oil change.
More frequent lubrication may be required for
heavy
-duty or off-road use.

3500 HD Models with applications requiring
extreme overload/trailer towing conditions and
high
-speed (above 45 mph or 70 km/h) conditions
for extended periods of time must have the drive axle
fluid changed every 30,000 miles (50 000 km).
See ªRecommended Fluids and Lubricantsº in
this section.

Short Trip/City Scheduled Maintenance -- Gasoline Engines
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7-18
50,000 Miles (83 000 km)

Change automatic transmission fluid and filter if the vehicle's GVWR is over
8600 lbs. or if the vehicle is mainly driven under one or more of these
conditions:
± In heavy city traffic where the outside temperature regularly reaches 90
F
(32
C) or higher.
± In hilly or mountainous terrain.
± When doing frequent trailer towing.
± Uses such as found in taxi, police or delivery service.
If you do not use your vehicle under any of these conditions, change the fluid
and filter at 100,000 miles (166 000 km).
Manual transmission fluid doesn't require change.
51,000 Miles (85 000 km)
Change engine oil and filter (or every 3 months, whichever occurs first).
An Emission Control Service.
Lubricate chassis components (or every 3 months, whichever occurs first).
(See footnote #.)
Check rear/front axle fluid level and add fluid as needed. Check constant
velocity joints and axle seals for leaking. (See footnote **.)
ACTUAL
SERVICED BY:MILEAGE
DATE
ACTUAL
SERVICED BY:MILEAGE
DATE

Short Trip/City Scheduled Maintenance -- Gasoline Engines
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7-28
100,000 Miles (166 000 km)

Inspect spark plug wires.
An Emission Control Service.

Replace spark plugs.
An Emission Control Service.

Change automatic transmission fluid and filter if the vehicle's GVWR
is over 8600 lbs. or if the vehicle is mainly driven under one or more of
these conditions:
± In heavy city traffic where the outside temperature regularly reaches
90
F (32
C) or higher.
± In hilly or mountainous terrain.
± When doing frequent trailer towing.
± Uses such as found in taxi, police or delivery service.
Manual transmission fluid doesn't require change.
If you haven't used your vehicle under severe service conditions listed
previously and, therefore, haven't changed your automatic transmission fluid,
change both the fluid and filter. Manual transmission fluid doesn't
require change.
Inspect Positive Crankcase Ventilation (PCV) valve.
An Emission Control Service.ACTUAL
SERVICED BY:MILEAGE
DATE

Long Trip/Highway Scheduled Maintenance -- Gasoline Engines
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7-34
45,000 Miles (75 000 km)

Change engine oil and filter (or every 12 months, whichever occurs first).
An Emission Control Service.

Lubricate chassis components (or every 12 months, whichever occurs first).
(See footnote #.)

Check rear/front axle fluid level and add fluid as needed. Check constant
velocity joints and axle seals for leaking. (See footnote **.)

Vehicles With GVWR Above 10,000 lbs. Only: Inspect shields and underhood
insulation for damage or looseness. Adjust or replace as required. This is a
Noise Emission Control Service. Applicable only to vehicles sold in the
United States.

Rotate tires. See ªTire Inspection and Rotationº in the Index for proper
rotation pattern and additional information. (See footnote +.)
50,000 Miles (83 000 km)

Change automatic transmission fluid and filter if the vehicle's GVWR is over
8600 lbs. or if the vehicle is mainly driven under one or more of these conditions:
± In heavy city traffic where the outside temperature regularly reaches
90
F (32
C) or higher.
± In hilly or mountainous terrain.
± When doing frequent trailer towing.
± Uses such as found in taxi, police or delivery service.
ACTUAL
SERVICED BY:MILEAGE
DATE
ACTUAL
SERVICED BY:MILEAGE
DATE

Long Trip/Highway Scheduled Maintenance -- Gasoline Engines
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7-40
100,000 Miles (166 000 km)

Inspect spark plug wires. An Emission Control Service.

Replace spark plugs. An Emission Control Service.

Change automatic transmission fluid and filter if the vehicle's GVWR is over
8600 lbs. or if the vehicle is mainly driven under one or more of these conditions:
± In heavy city traffic where the outside temperature regularly reaches
90
F (32
C) or higher.
± In hilly or mountainous terrain.
± When doing frequent trailer towing.
± Uses such as found in taxi, police or delivery service.
Manual transmission fluid doesn't require change.
If you haven't used your vehicle under severe service conditions listed previously
and, therefore, haven't changed your automatic transmission fluid, change both
the fluid and filter. Manual transmission fluid doesn't require change.
Inspect Positive Crankcase Ventilation (PCV) valve.
An Emission Control Service.
150,000 Miles (240 000 km)
Drain, flush and refill cooling system (or every 60 months since last service,
whichever occurs first). See ªEngine Coolantº in the Index for what to use.
Inspect hoses. Clean radiator, condenser, pressure cap and neck.
Pressure test the cooling system and pressure cap.
An Emission Control Service.
ACTUAL
SERVICED BY:MILEAGE
DATE
ACTUAL
SERVICED BY:MILEAGE
DATE

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

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9-3
Wheels 6-67 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windshield and Wiper Blades 6-64 . . . . . . . . . . . . . . . . . . .
Climate Control System 3-2, 3-3 . . . . . . . . . . . . . . . . . . . . . . .
Clock, Setting the 3-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clutch Fluid, Hydraulic 6-24, 7-48 . . . . . . . . . . . . . . . . . . . . .
Clutch, System Check 7-42 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Comfort Controls 3-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Comfort Guides, Rear 1-43 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compact Disc Care 3-27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compact Disc Player 3-17, 3-21 . . . . . . . . . . . . . . . . . . . . . . .
Compact Disc Player Care 3-27 . . . . . . . . . . . . . . . . . . . . . . . .
Compass, Rearview Mirror with 2-45 . . . . . . . . . . . . . . . . . . .
Console Storage 2-53 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Control of a Vehicle 4-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Convex Outside Mirror 2-50 . . . . . . . . . . . . . . . . . . . . . . . . . .
Coolant 6-28, 6-76, 7-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Heater, Engine 2-15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Recovery Tank 5-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cooling System 5-11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Courtesy Transportation 8-8 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cruise Control 2-38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cupholders 2-53, 2-54, 2-55 . . . . . . . . . . . . . . . . . . . . . . . . . .
Customer Assistance for Text Telephone Users 8-4 . . . . . . . . .
Customer Assistance Information 8-1 . . . . . . . . . . . . . . . . . . .
Customer Satisfaction Procedure 8-2 . . . . . . . . . . . . . . . . . . . .
Damage, Finish 6-67 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Damage, Sheet Metal 6-67 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Daytime Running Lamps 2-42 . . . . . . . . . . . . . . . . . . . . . . . . .
Daytime Running Lamps Indicator Light 2-74 . . . . . . . . . . . .
Dead Battery 5-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Defects, Reporting Safety 8
-10 . . . . . . . . . . . . . . . . . . . . . . . .
Defensive Driving 4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defogger, Rear Window 3-6 . . . . . . . . . . . . . . . . . . . . . . . . . .
Defogging and Defrosting 3-6 . . . . . . . . . . . . . . . . . . . . . . . . .
Dolby Noise Reduction 3-15 . . . . . . . . . . . . . . . . . . . . . . . . . .
Dome Lamps 2-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door
Locks 2
-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Pocket 2-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Third 2-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Downshifting 2-21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver Position 1-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driving
City 4
-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Defensive 4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drunken 4-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Freeway 4-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
In a Blizzard 4-38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
In the Rain 4-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Night 4-27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Off-Road 4-14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On Curves 4-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
On Grades While Towing a Trailer 4-58 . . . . . . . . . . . . . . .
On Hill and Mountain Roads 4-34 . . . . . . . . . . . . . . . . . . . .
On Snow and Ice 4-37 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Through Water 4-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wet Roads 4-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Winter 4-36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
With a Trailer 4-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Drunken Driving 4-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dual Tire Operation 6-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .