2008 HUMMER H2 air conditioning

5. With the coolant surge tank pressure cap off, start
the engine and let it run until you can feel the upper
radiator hose getting hot. Watch out for the engine
cooling fan.
By this time, the coolant level inside the coolant
surge tank may be lower. If the level is lower, add
more of the proper mixture to the coolant surge tank
until the level reaches the FULL COLD mark.
6. Then replace the pressure cap. Be sure the
pressure cap is hand-tight and fully seated.
7. Verify coolant level after engine is shut off and the
coolant is cold. If necessary, repeat coolant ll
procedure steps 1 through 7.
Engine Fan Noise
If 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.
If your vehicle has electric cooling fans, you may hear
the fans spinning at low speed during most everyday
driving. The fans may turn off if no cooling is required.
Under heavy vehicle loading, trailer towing, and/or
high outside temperatures, or if you are operating your
air conditioning system, the fans may change to
high speed and you may hear an increase in fan noise.
This is normal and indicates that the cooling system
is functioning properly. The fans will change to low
speed when additional cooling is no longer required.
5-33

Tire Terminology and Denitions
Air Pressure:The amount of air inside the
tire pressing outward on each square inch of the
tire. Air pressure is expressed in pounds per
square inch (psi) or kilopascal (kPa).
Accessory Weight
:This means the combined
weight of optional accessories. Some examples of
optional accessories are, automatic transmission,
power steering, power brakes, power windows,
power seats, and air conditioning.
Aspect Ratio
:The relationship of a tire’s height
to its width.
Belt
:A rubber coated layer of cords that is located
between the plies and the tread. Cords may be
made from steel or other reinforcing materials.
Bead
:The tire bead contains steel wires wrapped
by steel cords that hold the tire onto the rim.
Bias Ply Tire
:A pneumatic tire in which the plies
are laid at alternate angles less than 90 degrees
to the centerline of the tread.Cold Tire Pressure
:The amount of air pressure
in a tire, measured in pounds per square inch
(psi) or kilopascals (kPa) before a tire has built up
heat from driving. SeeInflation - Tire Pressure
on page 5-61.
Curb Weight
:The weight of a motor vehicle with
standard and optional equipment including the
maximum capacity of fuel, oil, and coolant,
but without passengers and cargo.
DOT Markings
:A code molded into the sidewall
of a tire signifying that the tire is in compliance
with the U.S. Department of Transportation (DOT)
motor vehicle safety standards. The DOT code
includes the Tire Identication Number (TIN),
an alphanumeric designator which can also identify
the tire manufacturer, production plant, brand,
and date of production.
GVWR
:Gross Vehicle Weight Rating.
SeeLoading Your Vehicle on page 4-44.
GAWR FRT
:Gross Axle Weight Rating for the
front axle. SeeLoading Your Vehicle on
page 4-44.
5-58

Fuses Usage
1 Left Trailer Stop/Turn Lamp
2 Engine Controls
3Engine Control Module, Throttle
Control
4 Right Trailer Stop/Turn Lamp
5 Front Washer
6 Oxygen Sensors
7Vehicle Stability System, Antilock
Brake System-2
8 Trailer Back-up Lamps
9 Left Low-Beam Headlamp
10 Engine Control Module (Battery)
11 Fuel Injectors, Ignition Coils (Right Side)
12 Transmission Control Module (Battery)
13 Vehicle Back-up Lamps
14 Right Low-Beam Headlamp
15 Air Conditioning Compressor
16 Oxygen Sensors
17 Transmission Controls (Ignition)
18 Fuel Pump
19 Rear WasherFuses Usage
20 Fuel Injectors, Ignition Coils (Left Side)
21 Trailer Park Lamps
22 Left Park Lamps
23 Right Park Lamps
24 Horn
25 Right Side High-Beam Headlamp
26 Daytime Running Lamps (DRL)
27 Left High-Beam Headlamp
28 Sunroof
29Key Ignition System, Theft Deterrent
System
30 Windshield Wiper
31 SEO B2 Uptter Usage (Battery)
32 Electrically Controlled Air Suspension
33 Climate Controls (Battery)
34 Airbag System (Ignition)
35 Amplier
36 Audio System
37Miscellaneous (Ignition), Cruise
Control, Rear Vision Camera
38 Airbag System (Battery)
5-115

Fuses Usage
39 Instrument Panel Cluster
40 Run, Accessory
41 Auxiliary Climate Control (Ignition)
42 Rear Defogger
43 SEO B1 Uptter Usage (Battery)
44 Cigarette Lighter, Auxiliary Power Outlet
45 Special Equipment Option (SEO)
46 Climate Controls (Ignition)
47 Engine Control Module (Ignition)
50 Cooling Fan 1 (J-Case)
51Electronically Controlled Air Suspension
(J-Case)
52Vehicle Stability System, Antilock Brake
System-1 (J-Case)
53 Cooling Fan 2 (J-Case)
54 Starter (J-Case)
55 Stud 2 Trailer Brake Module (J-Case)
56 Left Bussed Electrical Center 1 (J-Case)
57Heated Windshield Washer System
(J-Case)Fuses Usage
58 Four-Wheel Drive System (J-Case)
59Stud 1 Trailer Connector Battery Power
(J-Case)
60 Mid Bussed Electrical Center 1 (J-Case)
61 Climate Control Blower (J-Case)
62 Left Bussed Electrical Center 2 (J-Case)
Relays Usage
FAN HI Cooling Fan High Speed
FAN LO Cooling Fan Low Speed
FAN CNTRL Cooling Fan Control
HDLP LO Low-Beam Headlamp
A/C CMPRSR Air Conditioning Compressor
STRTR Starter
PWR/TRN Powertrain
PRK LAMP Parking Lamps
REAR DEFOG Rear Defogger
RUN/CRNK Switched Power
5-116

Capacities and Specications
The following approximate capacities are given in English and metric. Please refer toRecommended Fluids and
Lubricants on page 6-12for more information.
Capacities and Specications
ApplicationCapacities
English Metric
Air Conditioning Refrigerant R134aFor the air conditioning system refrigerant charge
amount, see the refrigerant caution label located
under the hood. See your dealer/retailer for more
information.
Cooling System
1
SUV Model 16.7 qt 15.8 L
SUT Model 15.4 qt 14.6 L
Engine Oil with Filter
26.0 qt 5.7 L
Fuel Tank 32.0 gal 121.0 L
Transmission Fluid (Pan Removal and Filter Replacement) 6.0 qt 5.7 L
5-117

Maintenance Footnotes
#Lubricate the front suspension, steering linkage, and
parking brake cable guides. Control arm ball joints
require lubrication but 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, chafing, 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, chafing, 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,
fittings, and clamps; replace with genuine 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)Inspect wiper blades for wear, cracking, or
contamination. Clean the windshield and wiper blades, if
contaminated. Replace wiper blades that are worn or
damaged. See Windshield Wiper Blade Replacement on
page 5-54andWindshield, Backglass, and Wiper
Blades on page 5-105 for more information.
(e)Make sure the safety belt reminder light and safety
belt assemblies 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 see Checking
the Restraint Systems on page 1-76.
(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.
6-7

A
Accessories and Modications............................ 5-3
Adding Equipment to Your
Airbag-Equipped Vehicle...............................1-75
Additives, Fuel................................................. 5-6
Add-On Electrical Equipment...........................5-110
Air Cleaner/Filter, Engine.................................5-18
Air Conditioning..............................................3-22
Airbag
Off Light.....................................................3-35
Readiness Light..........................................3-34
Airbag System................................................1-64
What Will You See After an Airbag Inates?....1-70
When Should an Airbag Inate?....................1-69
Where Are the Airbags?...............................1-66
Airbag Systems
Adding Equipment to Your
Airbag-Equipped Vehicle............................1-75
Airbag Off Switch........................................1-72
How Does an Airbag Restrain?......................1-70
Servicing Your Airbag-Equipped Vehicle..........1-75
What Makes an Airbag Inate?......................1-70
Analog Clock..................................................3-21
Antenna, Fixed Mast......................................3-118
Antenna, XM™ Satellite Radio Antenna
System.....................................................3-118
Antilock Brake System (ABS)............................. 4-4
Antilock Brake, System Warning Light................3-39Appearance Care
Aluminum Wheels......................................5-106
Care of Safety Belts...................................5-103
Chemical Paint Spotting..............................5-107
Cleaning Exterior Lamps/Lenses..................5-104
Fabric/Carpet............................................5-101
Finish Care...............................................5-104
Finish Damage..........................................5-107
Instrument Panel, Vinyl, and Other
Plastic Surfaces.....................................5-102
Interior Cleaning........................................5-100
Leather....................................................5-102
Sheet Metal Damage
..................................5-106
Speaker Covers.........................................5-103
Tires........................................................5-106
Underbody Maintenance.............................5-107
Vehicle Care/Appearance Materials...............5-108
Washing Your Vehicle.................................5-103
Weatherstrips............................................5-103
Windshield, Backglass, and Wiper Blades......5-105
Wood Panels............................................5-103
Appointments, Scheduling Service....................... 7-8
Ashtray.........................................................3-21
Assist Steps...................................................4-32
Audio System.................................................3-72
Audio Steering Wheel Controls....................3-116
Fixed Mast Antenna...................................3-118
Navigation/Radio System,
see Navigation Manual............................3-104
1

Child Restraints
Child Restraint Systems...............................1-43
Infants and Young Children...........................1-39
Lower Anchors and Tethers for Children..........1-47
Older Children.............................................1-36
Securing a Child Restraint in a
Rear Seat Position...................................1-57
Securing a Child Restraint in the
Right Front Seat Position..........................1-60
Where to Put the Restraint...........................1-46
Cigarette Lighter.............................................3-21
Cleaning
Aluminum Wheels......................................5-106
Exterior Lamps/Lenses................................5-104
Fabric/Carpet............................................5-101
Finish Care...............................................5-104
Instrument Panel, Vinyl, and Other
Plastic Surfaces.....................................5-102
Interior.....................................................5-100
Leather....................................................5-102
Speaker Covers.........................................5-103
Tires........................................................5-106
Underbody Maintenance.............................5-107
Washing Your Vehicle.................................5-103
Weatherstrips............................................5-103
Windshield, Backglass, and Wiper Blades......5-105
Wood Panels............................................5-103Climate Control System
Dual Automatic............................................3-22
Outlet Adjustment........................................3-29
Rear Air Conditioning and Heating System,
Electronic................................................3-29
Clock............................................................3-21
Clock, Setting.................................................3-73
Collision Damage Repair..................................7-10
Compass.......................................................2-45
Content Theft-Deterrent....................................2-24
Control of a Vehicle.......................................... 4-3
Coolant
Engine Temperature Gage
............................3-40
Heater, Engine............................................2-31
Surge Tank Pressure Cap.............................5-26
Cooling System..............................................5-29
Cruise Control................................................3-12
Cruise Control Light........................................3-46
Cupholder(s)..................................................2-64
Customer Assistance Information
Courtesy Transportation.................................. 7-9
Customer Assistance for
Text Telephone (TTY) Users........................ 7-4
Customer Assistance Offices........................... 7-5
Customer Satisfaction Procedure..................... 7-2
GM Mobility Reimbursement Program............... 7-6
Reporting Safety Defects to General Motors....7-14
3