2010 HUMMER H3 heater

10-18 Vehicle Care
Cooling System
The cooling system allows the
engine to maintain the correct
working temperature.
3.7L L5 Engine
A. Coolant Recovery Tank
B. Engine Cooling Fan
C. Radiator Pressure Cap
5.3L V8 Engine
A. Coolant Recovery Tank
B. Radiator Pressure Cap
C. Engine Cooling Fan
{WARNING
An electric engine cooling fan
under the hood can start up even
when the engine is not running
and can cause injury. Keep
hands, clothing, and tools away
from any underhood electric fan.
{WARNING
Heater and radiator hoses, and
other engine parts, can be very
hot. Do not touch them. If you do,
you can be burned.
Do not run the engine if there is
a leak. If you run the engine, it
could lose all coolant. That could
cause an engine fire, and you
could be burned. Get any leak
fixed before you drive the vehicle.
Notice: Using coolant other
than DEX-COOL
®can cause
premature engine, heater core,
or radiator corrosion. In addition,
the engine coolant could require
changing sooner, at 50 000 km
(30,000 miles) or 24 months,
whichever occurs first. Any
repairs would not be covered by
the vehicle warranty. Always use
DEX-COOL
®(silicate-free) coolant
in the vehicle.

Vehicle Care 10-19
Engine Coolant
The cooling system in the vehicle
is filled with DEX-COOL®engine
coolant. This coolant is designed to
remain in the vehicle for five years
or 240 000 km (150,000 miles),
whichever occurs first.
The following explains the cooling
system and how to check and add
coolant when it is low. If there is a
problem with engine overheating,
see Engine Overheating
on
page 10‑22.
What to Use
{WARNING
Adding only plain water to
the cooling system can be
dangerous. Plain water, or some
other liquid such as alcohol,
can boil before the proper
coolant mixture will. The vehicle's
coolant warning system is set
for the proper coolant mixture.
(Continued)
WARNING (Continued)
With plain water or the wrong
mixture, the engine could get too
hot but you would not get the
overheat warning. The engine
could catch fire and you or
others could be burned. Use a
50/50 mixture of clean, drinkable
water and DEX-COOL
®coolant.
Use a 50/50 mixture of clean,
drinkable water and DEX-COOL
coolant. If using this mixture,
nothing else needs to be added.
This mixture:
.Gives freezing protection down
to −37°C (−34°F), outside
temperature.
.Gives boiling protection up
to 129°C (265°F), engine
temperature.
.Protects against rust and
corrosion.
.Will not damage aluminum parts.
.Helps keep the proper engine
temperature.
Notice: If an improper coolant
mixture is used, the engine could
overheat and be badly damaged.
The repair cost would not be
covered by the vehicle warranty.
Too much water in the mixture
can freeze and crack the engine,
radiator, heater core, and other
parts.
Notice: If extra inhibitors
and/or additives are used in the
vehicle's cooling system, the
vehicle could be damaged. Use
only the proper mixture of the
engine coolant listed in this
manual for the cooling system.
See Recommended Fluids and
Lubricants
on page 11‑8for more
information.

Vehicle Care 10-23
If Steam Is Coming From The
Engine Compartment
{WARNING
Steam from an overheated engine
can burn you badly, even if you
just open the hood. Stay away
from the engine if you see or hear
steam coming from it. Just turn it
off and get everyone away from
the vehicle until it cools down.
Wait until there is no sign of
steam or coolant before you open
the hood.
If you keep driving when your
engine is overheated, the liquids
in it can catch fire. You or others
could be badly burned. Stop your
engine if it overheats, and get out
of the vehicle until the engine
is cool.
If No Steam Is Coming From
The Engine Compartment
If an engine overheat warning is
displayed but no steam can be seen
or heard, the problem may not be
too serious. Sometimes the engine
can get a little too hot when the
vehicle:
.Climbs a long hill on a hot day.
.Stops after high-speed driving.
.Idles for long periods in traffic.
.Tows a trailer. See“Driving on
Grades” underTrailer Towingon
page 9‑74.
If the overheat warning is displayed
with no sign of steam:
1. Turn the air conditioning off.
2. Turn the heater on to the highest temperature and to the highest
fan speed. Open the windows as
necessary. 3. In heavy traffic, let the engine
idle in N (Neutral) while stopped.
If it is safe to do so, pull off
the road, shift to P (Park) or
N (Neutral) and let the
engine idle.
If the temperature overheat gauge
is no longer in the overheat zone
or an overheat warning no longer
displays, the vehicle can be driven.
Continue to drive the vehicle slow
for about 10 minutes. Keep a safe
vehicle distance from the car in front
of you. If the warning does not come
back on, continue to drive normally.
If the warning continues, pull
over, stop, and park the vehicle
right away.
If there is no sign of steam, idle
the engine for three minutes while
parked. If the warning is still
displayed, turn off the engine until
it cools down.

i-4 INDEX
E
E85 Fuel . . . . . . . . . . . . . . . . . . . . . . . 9-66
Electrical Equipment,Add-On . . . . . . . . . . . . . . . . . . . . . . 9-81
Electrical System Engine CompartmentFuse Block . . . . . . . . . . . . . . . . 10-39
Fuses and Circuit Breakers . . . . . . . . . . . . . . . . . . 10-39
Overload . . . . . . . . . . . . . . . . . . . 10-38
Engine
Air Cleaner/Filter . . . . . . . . . . . 10-17
Check and Service EngineSoon Lamp . . . . . . . . . . . . . . . . . . 5-12
Compartment Overview . . . . . . . 10-6
Coolant . . . . . . . . . . . . . . . . . . . . . 10-19
Coolant Heater . . . . . . . . . . . . . . . 9-36
Coolant Temperature Gauge . . . 5-9
Cooling System . . . . . . . . . . . . . 10-18
Cooling System Messages . . . 5-23
Drive Belt Routing . . . . . . . . . . . . 12-4
Exhaust . . . . . . . . . . . . . . . . . . . . . . 9-40
Fan . . . . . . . . . . . . . . . . . . . . . . . . . 10-24 Engine (cont.)
Overheating . . . . . . . . . . . . . . . . 10-22
Power Messages . . . . . . . . . . . . . 5-23
Pressure Light . . . . . . . . . . . . . . . . 5-17
Running While Parked . . . . . . . . 9-41
Starting . . . . . . . . . . . . . . . . . . . . . . . 9-35
Engine Oil Life System . . . . . . . . . . . . . . . . . .10-11
Messages . . . . . . . . . . . . . . . . . . . . 5-23
Equipment, Towing . . . . . . . . . . . . 9-78
Event Data Recorders . . . . . . . . 13-15
Exit Lighting . . . . . . . . . . . . . . . . . . . . 6-8
Extender, Safety Belt . . . . . . . . . . 3-26
Exterior Lamp Controls . . . . . . . . . 6-1
Exterior Lamps Off Reminder . . . 6-3
F
Fan Engine . . . . . . . . . . . . . . . . . . . . . . 10-24
Filter
Engine Air Cleaner . . . . . . . . . 10-17
Flash-to-Pass . . . . . . . . . . . . . . . . . . . 6-3
Flashers, Hazard Warning . . . . . . 6-5
Flat Tire . . . . . . . . . . . . . . . . . . . . . . 10-64
Flat Tire, Changing . . . .10-66, 10-75 Fluid
Automatic Transmission . . . . 10-12
Brakes . . . . . . . . . . . . . . . . . . . . . . 10-27
Four-Wheel Drive
Transfer Case . . . . . . . . . . . . . . . 9-46
Power Steering . . . . . . . . . . . . . 10-24
Washer . . . . . . . . . . . . . . . . . . . . . 10-25
Fog Lamps Bulb Replacement . . . . . . . . . . . . . 6-6
Folding Mirrors . . . . . . . . . . . . . . . . 2-13
Four-Wheel Drive . . . . . . . 10-29, 9-46
Front Axle . . . . . . . . . . . . . . . . . . . . 10-29 Locking . . . . . . . . . . . . . . . . . . . . . . . 9-55
Front Seats Adjustment . . . . . . . . . . . . . . . . . . . . 3-3
Heated . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Front Storage . . . . . . . . . . . . . . . . . . . 4-1
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-64 Additives . . . . . . . . . . . . . . . . . . . . . 9-65
E85 (85% Ethanol) . . . . . . . . . . . 9-66
Filling a Portable FuelContainer . . . . . . . . . . . . . . . . . . . 9-69
Filling the Tank . . . . . . . . . . . . . . . 9-68

INDEX i-5
Fuel (cont.)Fuels in Foreign Countries . . . . 9-65
Gasoline Specifications . . . . . . . 9-65
Gauge . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Recommended . . . . . . . . . . . . . . . 9-64
Requirements, California . . . . . 9-65
System Messages . . . . . . . . . . . . 5-24
Fuel Economy Driving for Better . . . . . . . . . . . . . 1-18
Full-Size Spare Tire . . . . . . . . . . 10-85
Fuses Engine CompartmentFuse Block . . . . . . . . . . . . . . . . 10-39
Fuses and Circuit
Breakers . . . . . . . . . . . . . . . . . . 10-39
G
Garage Door Opener . . . . . . . . . . 5-26Programming . . . . . . . . . . . . . . . . . 5-26
Gasoline
Specifications . . . . . . . . . . . . . . . . . 9-65 Gauges
Engine Coolant
Temperature . . . . . . . . . . . . . . . . . 5-9
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Odometer . . . . . . . . . . . . . . . . . . . . . . 5-8
Speedometer . . . . . . . . . . . . . . . . . . 5-8
Tachometer . . . . . . . . . . . . . . . . . . . . 5-8
Trip Odometer . . . . . . . . . . . . . . . . . 5-8
Warning Lights and Indicators . . . . . . . . . . . . . . . . . . . . 5-6
General Information
Service and Maintenance . . . . . 11-1
Towing . . . . . . . . . . . . . . . . . . . . . . . . 9-70
Vehicle Care . . . . . . . . . . . . . . . . . . 10-2
Glove Box . . . . . . . . . . . . . . . . . . . . . . 4-1
H
Halogen Bulbs . . . . . . . . . . . . . . . . 10-35
Hazard Warning Flashers . . . . . . . 6-5
Head Restraints . . . . . . . . . . . . . . . . 3-2 Headlamps . . . . . . . . . . . . . . . . . . . 10-35
Aiming . . . . . . . . . . . . . . . . . . . . . . 10-33
Automatic . . . . . . . . . . . . . . . . . . . . . . 6-4
Bulb Replacement . . . . . . . . . . 10-35
Daytime Running
Lamps (DRL) . . . . . . . . . . . . . . . . . 6-3
Flash-to-Pass . . . . . . . . . . . . . . . . . . 6-3
High-Beam On Light . . . . . . . . . . 5-17
High/Low Beam Changer . . . . . . 6-3
Heated Front Seats . . . . . . . . . . . . . 3-6
Heater Engine Coolant . . . . . . . . . . . . . . . 9-36
High-Beam On Light . . . . . . . . . . . 5-17
Highway Hypnosis . . . . . . . . . . . . . 9-22
Hill and Mountain Roads . . . . . . . 9-23
Hill Start Assist (HSA) . . . . . . . . . 9-52
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . 10-5
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
How to Wear Safety Belts Properly . . . . . . . . . . . . . . . . . . . . . . 3-15
Hydraulic Clutch . . . . . . . . . . . . . . 10-16