2004 GMC CANYON radiator cap

6. Start the engine and let it run until you can feel the
upper radiator hose getting hot. Watch out for the
engine cooling fan.
7. By this time, the coolant level inside the radiator
ller neck may be lower. If the level is lower, add
more of the proper DEX-COOL
®coolant mixture
through the ller neck until the level reaches
the base of the ller neck.
Then replace the pressure cap. At any time during
this procedure if coolant begins to ow out of
the ller neck, reinstall the pressure cap. Be sure to
secure it tightly.
Engine Fan Noise
This 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 clutch is not engaged. This improves fuel
economy and reduces fan noise. Under heavy vehicle
loading, trailer towing and/or high outside temperatures,
the fan speed increases when the clutch 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 disengages.
5-35

Power Steering Fluid
The power steering uid reservoir is located near the
front of the engine compartment, behind the radiator.
SeeEngine Compartment Overview on page 5-12
for power steering uid reservoir location.
When to Check Power Steering Fluid
It is not necessary to regularly check power steering uid
unless you suspect there is a leak in the system or
you hear an unusual noise. A uid loss in this system
could indicate a problem. Have the system inspected
and repaired.
How to Check Power Steering Fluid
1. Turn the key off and let the engine compartment
cool down.
2. Wipe the cap and the top of the reservoir clean.
3. Unscrew the cap and wipe the dipstick with a
clean rag.
4. Replace the cap and completely tighten it.
5. Then remove the cap again and look at the uid
level on the dipstick.
The level should be between the ADD and FULL marks.
If necessary, add only enough uid to bring the level
up to the proper range.
What to Use
To determine what kind of uid to use, see
Recommended Fluids and Lubricants on page 6-13.
Always use the proper uid. Failure to use the proper
uid can cause leaks and damage hoses and seals.
5-36

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.
(a)Visually inspect brake lines and hoses for proper
hook-up, binding, leaks, cracks, chang, etc. Inspect
drum brake linings for wear or cracks. Inspect disc brake
pads for wear and rotors for surface condition. Inspect
other brake parts, including drums, wheel cylinders,
calipers, parking brake, etc. Check parking brake
adjustment.
(b)Visually inspect front and rear suspension and
steering system for damaged, loose or missing parts or
signs of wear. 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.)
6-7

(f)Lubricate all key lock cylinders, body door and fuel
door hinges, latches and locks (including glove box
and console doors), hood latch assembly, secondary
latch, pivots, spring anchor, release pawl and any
moving seat hardware. Lubricate hood safety lever
pivot and prop rod pivot and tailgate latch bolt, handle
assembly pivot points and hinges. 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)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.(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 5-25for what to use. Inspect hoses.
Clean radiator, condenser, pressure cap and ller neck.
Pressure test the cooling system and pressure cap.
6-8

Power and Heated Seat Circuit Breakers..........5-104
Power Steering...............................................4-10
Pretensioners, Safety Belt................................1-30
Programmable Automatic Door Locks.................. 2-8
Q
Questions and Answers About Safety Belts.........1-15
R
Radiator Pressure Cap....................................5-28
Radio Data System (RDS).......................3-50, 3-59
Radio Messages.....................................3-46, 3-53
Radios..........................................................3-42
AM-FM Radio.............................................3-44
Care of Your CD Player...............................3-68
Care of Your CDs........................................3-68
Radio with CD............................................3-47
Radio with Six-Disc CD................................3-56
Setting the Time for Radios with
Radio Data Systems (RDS).......................3-43
Setting the Time for Radios without
Radio Data Systems (RDS).......................3-43
Theft-Deterrent............................................3-67
Understanding Reception..............................3-68
RDS Messages......................................3-52, 3-61Rear Axle......................................................5-47
Rear Door Security Locks.................................. 2-9
Rear Doors....................................................2-10
Rear Safety Belt Comfort Guides......................1-28
Rear Seat Operation.................................1-9, 1-10
Rear Seat Passengers, Safety Belts..................1-26
Rear Storage Area..........................................2-43
Rearview Mirror, Automatic Dimming with
Compass and Temperature Display................2-37
Rearview Mirror with OnStar
®...........................2-36
Rearview Mirrors.............................................2-36
Reclining Seatbacks.......................................... 1-6
Recommended Fluids and Lubricants.................6-13
Recreational Vehicle Towing.............................4-47
REDUCED POWER........................................3-41
Regular Cab Models and
Extended Cab Models
without Rear Seats..............3-26, 1-48, 1-54, 1-70
Remote Keyless Entry System............................ 2-4
Remote Keyless Entry System, Operation............ 2-5
Removing the Flat Tire and Installing the
Spare Tire..................................................5-78
Removing the Spare Tire and Tools...................5-75
Replacement Bulbs.........................................5-54
Replacing Brake System Parts..........................5-41
Replacing Restraint System Parts
After a Crash..............................................1-74
11