overheating HUMMER H2 2009 User Guide

Checking Coolant
The coolant surge tank is
located in the engine
compartment on the
passenger side of the
vehicle. SeeEngine
Compartment Overview on
page 5-14for more
information on location.
{CAUTION:
Turning the surge tank pressure cap when the
engine and radiator are hot can allow steam and
scalding liquids to blow out and burn you badly.
Never turn the surge tank pressure cap — even a
little — when the engine and radiator are hot.
The vehicle must be on a level surface. When the
engine is cold, the coolant level should be at the FULL
COLD mark.
Adding Coolant
If you need more coolant, add the proper DEX-COOL®
coolant mixture at the surge tank, but only when the
engine is cool.
{CAUTION:
You can be burned if you spill coolant on hot
engine parts. Coolant contains ethylene glycol,
and it will burn if the engine parts are hot enough.
Do not spill coolant on a hot engine.
When replacing the pressure cap, make sure it is
hand-tight and fully seated.
Engine Overheating
You will nd a coolant temperature gage on the vehicle’s
instrument panel. SeeEngine Coolant Temperature
Gage on page 3-39.
In addition, you will nd an ENGINE OVERHEATED
IDLE ENGINE and an ENGINE POWER IS REDUCED
message in the Driver Information Center (DIC) on
the instrument panel. SeeDIC Warnings and Messages
on page 3-56.
5-33

Tires
Your new vehicle comes with high-quality tires
made by a leading tire manufacturer. If you ever
have questions about your tire warranty and where
to obtain service, see your vehicle Warranty
booklet for details. For additional information refer
to the tire manufacturer.
{CAUTION:
Poorly maintained and improperly used tires
are dangerous.
Overloading your vehicle’s tires can
cause overheating as a result of too
much exing. You could have an air-out
and a serious accident. SeeLoading the
Vehicle on page 4-44.
CAUTION: (Continued)
CAUTION: (Continued)

Underinated tires pose the same danger
as overloaded tires. The resulting
accident could cause serious injury.
Check all tires frequently to maintain the
recommended pressure. Tire pressure
should be checked when your vehicle’s
tires are cold. SeeInflation - Tire
Pressure on page 5-63.
Overinated tires are more likely to be
cut, punctured, or broken by a sudden
impact — such as when you hit a
pothole. Keep tires at the recommended
pressure.
Worn, old tires can cause accidents.
If the tire’s tread is badly worn, or if your
vehicle’s tires have been damaged,
replace them.
5-57

Electrical System (cont.)
Power Windows and Other Power Options....5-110
Underhood Fuse Block...............................5-113
Windshield Wiper Fuses.............................5-110
Electronic Immobilizer
PASS-Key
®III+...........................................2-25
Electronic Immobilizer Operation
PASS-Key
®III+...........................................2-26
Electronically Controlled Air Suspension System . . . 4-53
Engine
Air Cleaner/Filter.........................................5-20
Check and Service Engine Soon Lamp...........3-40
Coolant......................................................5-31
Coolant Heater............................................2-31
Coolant Temperature Gage...........................3-39
Drive Belt Routing.......................................6-16
Engine Compartment Overview......................5-14
Exhaust.....................................................2-45
Oil .............................................................5-15
Oil Life System...........................................5-18
Overheated Protection Operating Mode...........5-35
Overheating................................................5-33
Starting......................................................2-29
Entry/Exit Lighting...........................................3-18
Event Data Recorders.....................................7-17
Extender, Safety Belt.......................................1-39
Exterior Lamps...............................................3-15
F
Filter
Engine Air Cleaner......................................5-20
Finish Damage.............................................5-108
First Aid Kit....................................................4-42
Fixed Mast Antenna.......................................3-130
Flashers, Hazard Warning.................................. 3-6
Flash-to-Pass................................................... 3-9
Flat Tire........................................................5-79
Flat Tire, Changing.........................................5-80
Flat Tire, Storing.....................................5-95, 5-98
Fluid
Automatic Transmission................................5-23
Power Steering...........................................5-36
Windshield Washer......................................5-37
Folding Rear Seat...........................................1-11
Four-Wheel Drive............................................5-48
Four-Wheel Drive, Full-Time.............................2-37
Front Axle......................................................5-49
Front Mounted Receiver...................................4-43
Fuel............................................................... 5-5
Additives...................................................... 5-6
California Fuel.............................................. 5-6
Driving for Better Economy............................. 4-2
E85 (85% Ethanol)........................................ 5-7
Filling a Portable Fuel Container....................5-10
5