2004 CHEVROLET SILVERADO cooling

Scheduled Maintenance
Service MaintenanceIMaintenanceII
Change engine oil and lter. Reset oil life system. SeeEngine Oil on
page 5-20.An Emission Control Service.••
Allison transmission only: Replace external control-main lter only at the rst
maintenance service performed on the vehicle.
Lubricate chassis components.See footnote #.••
Visually check for any leaks or damage.See footnote (j).••
Inspect engine air cleaner lter or change indicator (if equipped). If necessary,
replace lter. SeeEngine Air Cleaner/Filter on page 5-25.An Emission Control
Service. See footnote †.••
Rotate tires and check ination pressures and wear. SeeTires on page 5-74.••
Inspect brake system.See footnote (a).••
Check engine coolant and windshield washer uid levels and add uid
as needed.••
Perform any needed additional services. See “Additional Required Services” in
this section.••
Inspect suspension and steering components.See footnote (b).•
Inspect engine cooling system.See footnote (c).•
Inspect wiper blades.See footnote (d).•
Inspect restraint system components.See footnote (e).•
Lubricate body components.See footnote (f).•
Check transmission uid level and add uid as needed.•
6-5

Additional Required Services (cont’d)
Service and Miles (Kilometers)25,000
(41 500)50,000
(83 000)75,000
(125 000)100,000
(166 000)125,000
(207 500)150,000
(240 000)
Except Allison: Change automatic
transmission uid and lter (severe
service).See footnote (h).•••
Except Allison: Change automatic
transmission uid and lter
(normal service).•
Four-wheel drive with automatic
transfer case only: Change transfer
case uid.See footnote (g).•••
Inspect evaporative control system.An
Emission Control Service. See
footnotes † and (k).•••
Replace spark plugs and inspect
spark plug wires.An Emission
Control Service.•
Engine cooling system service (or
every 5 years, whichever occurs rst).
An Emission Control Service. See
footnote (i).•
Inspect engine accessory drive belt.An
Emission Control Service.•
5-speed manual transmission only:
Change manual transmission uid.•
6-7

Maintenance Footnotes
†The U.S. Environmental Protection Agency or the
California Air Resources Board has determined that the
failure to perform this maintenance item will not nullify
the emission warranty or limit recall liability prior to
the completion of the vehicle’s useful life. We, however,
urge that all recommended maintenance services be
performed at the indicated intervals and the
maintenance be recorded.
#Lubricate the front suspension, ball joints, steering
linkage, transmission shift linkage and parking
brake cable guides. Ball joints should not be lubricated
unless their temperature is 10°F (-12°C) or higher,
or they could be damaged. Vehicles used under severe
commercial operating conditions require lubrication
on a regular basis every 3,000 miles (5 000 km).
(a)Visually inspect brake lines and hoses for proper
hook-up, binding, leaks, cracks, chang, etc. Inspect
disc brake pads for wear and rotors for surface
condition. Inspect other brake parts, including calipers,
parking brake, etc.
(b)Visually inspect front and rear suspension and
steering system for damaged, loose or missing parts,
signs of wear or lack of lubrication. Inspect power
steering lines and hoses for proper hook-up, binding,
leaks, cracks, chang, etc. Visually check constant
velocity joints, rubber boots and axle seals for leaks.(c)Visually inspect hoses and have them replaced if
they are cracked, swollen or deteriorated. Inspect all
pipes, ttings and clamps; replace with genuine GM parts
as needed. To help ensure proper operation, a pressure
test of the cooling system and pressure cap and cleaning
the outside of the radiator and air conditioning condenser
is recommended at least once a year.
(d)Visually inspect wiper blades for wear or cracking.
Replace blade inserts that appear worn or damaged
or that streak or miss areas of the windshield.
(e)Make sure the safety belt reminder light and all your
belts, buckles, latch plates, retractors and anchorages
are working properly. Look for any other loose or
damaged safety belt system parts. If you see anything
that might keep a safety belt system from doing its
job, have it repaired. Have any torn or frayed safety belts
replaced. Also look for any opened or broken air bag
coverings, and have them repaired or replaced. (The air
bag system does not need regular maintenance.)
(f)Lubricate all key lock cylinders, body door hinges,
hood latch assembly, secondary latch, pivots, spring
anchor, release pawl, tailgate hinges, tailgatelinkage,
tailgate handle pivot points, latch bolt, fuel door
hinge, locks and folding seat hardware. More frequent
lubrication may be required when exposed to a corrosive
environment. Applying silicone grease on weatherstrips
with a clean cloth will make them last longer, seal
better and not stick or squeak.
6-8

(g)Add uid as needed. A uid loss could indicate a
problem; repair as needed. Check vent hose at transfer
case for kinks and proper installation.
(h)Change automatic transmission uid and lter if the
vehicle 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.
(i)Drain, ush and rell cooling system. See Engine
Coolant on page 5-35for what to use. Inspect hoses.
Clean radiator, condenser, pressure cap and ller neck.
Pressure test the cooling system and pressure cap.
(j)A uid loss in any vehicle system could indicate a
problem. Have the system inspected and repaired and
the uid level checked. Add uid if needed.
(k)Inspect system. Check all fuel and vapor lines and
hoses for proper hook-up, routing and condition.
Check that the purge valve works properly (if equipped).
Replace as needed.(l)Change clutch uid (or every 24 months, whichever
occurs rst).
(m)Change automatic transmission uid and lter 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.
Owner Checks and Services
These owner checks and services should be performed
at the intervals specied to help ensure the safety,
dependability and emission control performance of your
vehicle. Your GM Goodwrench dealer can assist you
with these checks and services.
Be sure any necessary repairs are completed at once.
Whenever any uids or lubricants are added to your
vehicle, make sure they are the proper ones, as shown
inRecommended Fluids and Lubricants on page 6-13.
6-9

Chime Level Adjustment.................................3-130
Cigarette Lighter.............................................3-20
Cleaning
Inside of Your Vehicle.................................5-114
Outside of Your Vehicle..............................5-117
Underbody Maintenance.............................5-120
Weatherstrips............................................5-117
Cleaning Aluminum or Chrome-Plated Wheels.....5-119
Cleaning Exterior Lamps/Lenses......................5-118
Cleaning Fabric/Carpet...................................5-114
Cleaning Glass Surfaces................................5-116
Cleaning Interior Plastic Components...............5-116
Cleaning Leather...........................................5-116
Cleaning the Mirror.................................2-58, 2-60
Cleaning the Top of the Instrument Panel.........5-116
Cleaning the Video Screen.............................3-125
Cleaning the Windshield and Wiper Blades.......5-119
Cleaning Tires..............................................5-119
Cleaning Vinyl..............................................5-116
Climate Control System...................................3-20
Dual..........................................................3-22
Dual Automatic............................................3-25
Clutch, Hydraulic.............................................5-34
Compass Calibration...............................2-57, 2-59
Compass Operation.........................................2-59
Compass Variance..................................2-56, 2-59
Content Theft-Deterrent....................................2-20Control of a Vehicle.......................................... 4-5
Coolant
Engine Temperature Gage............................3-46
Heater, Engine............................................2-26
Surge Tank Pressure Cap.............................5-38
Cooling System..............................................5-41
Crew Cab......................................................1-56
Cruise Control................................................3-10
Cruise Control Light........................................3-51
Cupholder(s)..................................................2-67
Current and Past Model Order Forms................7-12
Customer Assistance Information
Courtesy Transportation.................................. 7-7
Customer Assistance for Text Telephone (TTY)
Users....................................................... 7-4
Customer Assistance Offices........................... 7-4
Customer Satisfaction Procedure..................... 7-2
GM Mobility Program for Persons
with Disabilities.......................................... 7-5
Reporting Safety Defects to General Motors.......7-11
Reporting Safety Defects to the Canadian
Government............................................7-11
Reporting Safety Defects to the United States
Government............................................7-10
Roadside Assistance Program......................... 7-6
Service Publications Ordering Information........7-11
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