2010 HUMMER H3 heating

10-22 Vehicle Care
6. Start the engine and let it rununtil 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 filler neck
might be lower. If the level is
lower, add more of the proper
DEX‐COOL coolant mixture
through the filler neck until the
level reaches the base of the
filler neck.
8. Then replace the pressure cap. At any time during this procedure
if coolant begins to flow out of
the filler neck, reinstall the
pressure cap.
Notice:
If the pressure cap is not
tightly installed, coolant loss and
possible engine damage may
occur. Be sure the cap is properly
and tightly secured.
Engine Overheating
The vehicle has an indicator to warn
of engine overheating.
A coolant temperature gauge is
displayed on the instrument panel.
See Engine Coolant Temperature
Gauge on page 5‑9.
You may decide not to lift the
hood when this warning appears,
but instead get service help right
away. See Roadside Service
on
page 13‑5.
If you do decide to lift the hood,
make sure the vehicle is parked on
a level surface. Then check to see if the engine
cooling fans are running. If the
engine is overheating, both fans
should be running. If they are not,
do not continue to run the engine
and have the vehicle serviced.
The air conditioning might stop
working if the engine is too hot. This
is normal and helps cool the engine.
Notice:
Engine damage from
running the engine without
coolant is not covered by the
warranty.
Notice: If the engine catches
fire because of being driven
with no coolant, your vehicle can
be badly damaged. The costly
repairs would not be covered by
the vehicle warranty.

Vehicle Care 10-43
RelayUsage
66 Stop Lamp
(H3T Only)
69 Fog Lamp
70 High, Low Beam
Headlamps
71 Rear Defogger
72 Windshield Wiper
On/Off
73 Windshield Wiper
High/Low
74 Horn Relay
Usage
75 Headlamp
76 Air Conditioning
Clutch
77 Powertrain Control
Module (Starter)
78 Run, Crank
79 Daytime Running
Lamps
80 Air Injection Reactor
(AIR) Solenoid
81 Powertrain Relay
Usage
86 Back-up
87 Ignition 3 (Heating,
Ventilation, Air
Conditioning)
88 Retained Accessory
Power/Accessory
89 Park Lamp
Diode Usage
65 Wiper Diode
90 Air Conditioning
Clutch Diode

10-44 Vehicle Care
Wheels and Tires
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.
{WARNING
Poorly maintained and improperly
used tires are dangerous.
.Overloading your tires can
cause overheating as a result
of too much flexing. You
could have an air-out and a
serious accident. SeeVehicle
Load Limits on page 9‑27.
(Continued)
WARNING (Continued)
.Underinflated 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
tires are cold. See Tire
Pressure on page 10‑51.
.Overinflated 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 your tread is
badly worn, or if your tires
have been damaged,
replace them.
Tire Sidewall Labeling
Useful information about a tire
is molded into the sidewall.
The following illustrations are
examples of a typical P‐Metric
and a LT‐Metric tire sidewall.
Passenger (P‐Metric) Tire
(A) Tire Size:The tire size
code is a combination of letters
and numbers used to define a
particular tire's width, height,
aspect ratio, construction type,

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-7
Lower Anchors and Tethersfor Children (LATCH
SYSTEM) . . . . . . . . . . . . . . . . . . . . 3-51
Lumbar Adjustment . . . . . . . . . . . . . 3-4 Front Seats . . . . . . . . . . . . . . . . . . . . 3-4
M
MaintenanceRecords . . . . . . . . . . . . . . . . . . . . . 11-11
Maintenance Schedule Recommended Fluids andLubricants . . . . . . . . . . . . . . . . . . . 11-8
Scheduled Maintenance . . . . . . 11-2
Transfer Case Vent Filter . . . . . 9-46
Malfunction Indicator Lamp . . . . 5-12
Manual Transmission . . . . . . . . . . 9-44 Fluid . . . . . . . . . . . . . . . . . . . . . . . . 10-15
Messages
Battery Voltage andCharging . . . . . . . . . . . . . . . . . . . . 5-21
Brake System . . . . . . . . . . . . . . . . 5-22
Door Ajar . . . . . . . . . . . . . . . . . . . . . 5-22
Engine Cooling System . . . . . . . 5-23
Engine Oil . . . . . . . . . . . . . . . . . . . . 5-23
Engine Power . . . . . . . . . . . . . . . . 5-23
Fuel System . . . . . . . . . . . . . . . . . . 5-24 Messages (cont.)
Lamp . . . . . . . . . . . . . . . . . . . . . . . . . 5-24
Ride Control System . . . . . . . . . . 5-24
Service Vehicle . . . . . . . . . . . . . . . 5-25
Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-25
Transmission . . . . . . . . . . . . . . . . . 5-25
Vehicle . . . . . . . . . . . . . . . . . . . . . . . 5-21
Mirrors Automatic Dimming
Rearview . . . . . . . . . . . . . . . . . . . . 2-14
Convex . . . . . . . . . . . . . . . . . . . . . . . 2-13
Folding . . . . . . . . . . . . . . . . . . . . . . . 2-13
Power . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Monitor System, Tire
Pressure . . . . . . . . . . . . . . . . . . . . 10-52
N
Navigation SystemVehicle Data Recordingand Privacy . . . . . . . . . . . . . . . 13-16
Net, Convenience . . . . . . . . . . . . . . 4-3
New Vehicle Break-In . . . . . . . . . . 9-33
O
Odometer . . . . . . . . . . . . . . . . . . . . . . . 5-8 Trip . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Off-Road . . . . . . . . . . . . . . . . . . . . . . . 9-7 Driving . . . . . . . . . . . . . . . . . . . . . . . . . 9-7
Lamps . . . . . . . . . . . . . . . . . . . . . . . . . 6-6
Recovery . . . . . . . . . . . . . . . . . . . . . . 9-5
Oil Engine . . . . . . . . . . . . . . . . . . . . . . . . 10-9
Engine Oil Life System . . . . . .10-11
Messages . . . . . . . . . . . . . . . . . . . . 5-23
Pressure Light . . . . . . . . . . . . . . . . 5-17
Older Children, Restraints . . . . . 3-42
Online Owner Center . . . . . . . . . . 13-4
OnStar
®System . . . . . . . . . . . . . . . 1-19
Operation, Infotainment
System . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Outlets Power . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
Overheating, Engine . . . . . . . . . . 10-22