2004 GMC YUKON cooling

Engine Fan Noise
Your vehicle has a clutched engine cooling fan. When the
clutch is engaged, the fan spins faster to provide more air
to cool the engine. In most everyday driving conditions,
the fan is spinning slower and the clutch is not fully
engaged. This improves fuel economy and reduces fan
noise. Under heavy vehicle loading, trailer towing and/or
high outside temperatures, the fan speed increases as
the clutch more fully engages. So you may hear an
increase in fan noise. This is normal and should not be
mistaken as the transmission slipping or making extra
shifts. It is merely the cooling system functioning properly.
The fan will slow down when additional cooling is not
required and the clutch disengages.
You may also hear this fan noise when you start the
engine. It will go away as the fan clutch partially
disengages.
Power Steering Fluid
8100 Engines
5-38

Wheel Replacement
Replace any wheel that is bent, cracked or badly rusted
or corroded. If wheel nuts keep coming loose, the
wheel, wheel bolts and wheel nuts should be replaced.
If the wheel leaks air, replace it (except some
aluminum wheels, which can sometimes be repaired).
See your dealer if any of these conditions exist.
Your dealer will know the kind of wheel you need.
Each new wheel should have the same load-carrying
capacity, diameter, width, offset and be mounted
the same way as the one it replaces.
If you need to replace any of your wheels, wheel bolts
or wheel nuts, replace them only with new GM
original equipment parts. This way, you will be sure to
have the right wheel, wheel bolts and wheel nuts
for your vehicle.{CAUTION:
Using the wrong replacement wheels, wheel
bolts or wheel nuts on your vehicle can be
dangerous. It could affect the braking and
handling of your vehicle, make your tires lose
air and make you lose control. You could have
a collision in which you or others could be
injured. Always use the correct wheel, wheel
bolts and wheel nuts for replacement.
Notice:The wrong wheel can also cause problems
with bearing life, brake cooling, speedometer or
odometer calibration, headlamp aim, bumper height,
vehicle ground clearance and tire or tire chain
clearance to the body and chassis.
SeeChanging a Flat Tire on page 5-84for more
information.
5-81

After rell, the level must be rechecked. SeeCooling System on page 5-32.
Cooling System Capacity
ApplicationCapacities
English Metric
Cooling System
VORTEC™ 4800 V8 Automatic with front A/C 15.0 quarts 14.0 L
VORTEC™ 4800 V8 Automatic with front and rear A/C 17.0 quarts 16.0 L
VORTEC™ 5300 V8 Automatic with front A/C 13.0 quarts 12.0 L
VORTEC™ 5300 V8* Automatic with front and rear A/C 17.0 quarts 16.0 L
VORTEC™ 6000 V8 Automatic 13.0 quarts 12.0 L
VORTEC™ 6000 V8** Automatic with engine oil cooler 14.0 quarts 13.0 L
VORTEC™ 8100 V8 Automatic 20.0 quarts 18.0 L
*Vehicles equipped with the optional air conditioner.
**Vehicles equipped with the optional engine oil cooler.
Add one liter if equipped with rear heating for all engines.
5-123

Scheduled Maintenance
Service MaintenanceIMaintenanceII
Change engine oil and lter. Reset oil life system. SeeEngine Oil on
page 5-16.An Emission Control Service.••
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 5-21.An Emission Control
Service. See footnote †.••
Rotate tires and check ination pressures and wear. SeeTires on page 5-63.••
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)
Service25,000
(41 500)50,000
(83 000)75,000
(125 000)100,000
(166 000)125,000
(207 500)150,000
(240 000)
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.•
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.(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.
6-7

(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, hood latch assembly,
secondary latch, pivots, spring anchor, release pawl, rear
compartment hinges, outer liftgate handle pivot points,
rear door detent link, roller mechanism, liftgate handle
pivot points, latch bolt, fuel door hinge, cargo 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.(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 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 5-26for 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.
6-8

Child Restraints (cont.)
Securing a Child Restraint in the Right Front
Seat Position...........................................1-68
Top Strap...................................................1-55
Top Strap Anchor Location............................1-57
Where to Put the Restraint...........................1-54
Chime Level Adjustment.................................3-139
Cigarette Lighter.............................................3-21
Cleaning
Inside of Your Vehicle.................................5-104
Outside of Your Vehicle..............................5-107
Underbody Maintenance.............................5-109
Video Screen............................................3-139
Weatherstrips............................................5-106
Cleaning Aluminum or Chrome-Plated Wheels.....5-108
Cleaning Exterior Lamps/Lenses......................5-107
Cleaning Fabric/Carpet...................................5-104
Cleaning Glass Surfaces................................5-106
Cleaning Interior Plastic Components...............5-106
Cleaning Leather...........................................5-105
Cleaning the Mirror.................................2-46, 2-49
Cleaning the Top of the Instrument Panel.........5-106
Cleaning the Windshield, Backglass and Wiper
Blades.....................................................5-108
Cleaning Tires..............................................5-109
Cleaning Vinyl..............................................5-105
Climate Control System...................................3-22
Dual..........................................................3-23
Dual Automatic............................................3-27
Rear Air Conditioning and Heating System......3-35Climate Control System (cont.)
Rear Air Conditioning and Heating System,
Electronic................................................3-38
Rear Air Conditioning System........................3-34
Compass Calibration...............................2-46, 2-47
Compass Operation.........................................2-47
Compass Variance..................................2-45, 2-48
Content Theft-Deferrent....................................2-18
Control of a Vehicle.......................................... 4-5
Convenience Net............................................2-62
Coolant
Engine Temperature Gage............................3-49
Heater, Engine............................................2-23
Surge Tank Pressure Cap.............................5-28
Cooling System..............................................5-32
Cruise Control................................................3-11
Cruise Control Light........................................3-56
Cupholder(s)..................................................2-60
Current and Past Model Order Forms................7-13
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.......7-12
Reporting Safety Defects to the Canadian
Government............................................7-12
4