Cooling System
The Cooling System allows the engine to maintain the
correct working temperature.
A. Engine Cooling Fans
B. Engine Coolant Surge Tank
C. Pressure Cap{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. 3.6L V6 Engine shown, 2.4L L4 Engine similar
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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 rst. Any repairs
would not be covered by the vehicle warranty.
Always use DEX-COOL
®(silicate-free) coolant in the
vehicle.
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 150,000 miles
(240 000 km), 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, seeEngine
Overheating on page 6-28.
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. 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−34°F (−37°C),
outside temperature.
•Gives boiling protection up to 265°F (129°C),
engine temperature.
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•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. SeeRecommended Fluids and
Lubricants on page 7-10for more information.
Checking Coolant
The vehicle must be on a level surface when checking
the coolant level.
Check to see if coolant is visible in the coolant recovery
tank. If the coolant inside the coolant recovery tank is
boiling, do not do anything else until it cools down.
If coolant is visible but the coolant level is not at
or above the FULL COLD mark, add a 50/50 mixture of
clean, drinkable water and DEX-COOL
®coolant atthe coolant recovery tank, but be sure the cooling
system is cool before this is done. SeeEngine Coolant
on page 6-25for more information.
The coolant level should be at or above the FULL
COLD mark on the coolant surge tank. If it is not, you
may have a leak at the pressure cap or in the radiator
hoses, heater hoses, radiator, water pump, or
somewhere else in the cooling system.
How to Add Coolant to the
Recovery Tank
{WARNING:
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.
Notice:This vehicle has a speci c coolant ll
procedure. Failure to follow this procedure could
cause the engine to overheat and be severely
damaged.
If coolant is needed, add the proper DEX-COOL
®
coolant mixture at the coolant recovery tank.
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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. 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 the vehicles engine is
overheated, the liquids in it can catch fire. You or
others could be badly burned. Stop the engine if it
overheats, and get out of the vehicle until the
engine is cool.
SeeOverheated Engine Protection Operating Mode
on page 6-30for information on driving to a safe
place in an emergency.
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.
If the overheat warning is displayed with no sign of
steam:
1. Turn the air 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.
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Fuses Usage
1 Air Conditioner Clutch
2 Electronic Throttle Control
4Transmission Control Module
Ignition 1
5 Mass Airflow Sensor (LY7)
6 Emission
7 Left Headlamp Low-Beam
8 Horn
9 Right Headlamp Low-Beam
10 Front Fog Lamps
11 Left Headlamp High-Beam
12 Right Headlamp High-Beam
13Engine Control Module BATT
(LY7 & LE5)
14 Windshield Wiper
15 Antilock Brake System (IGN 1)
16Engine Control Module IGN 1
(LY7 & LE5)
17 Cooling Fan 1
18 Cooling Fan 2
19Run Relay, Heating, Ventilation, Air
Conditioning BlowerFuses Usage
20 Body Control Module 1
21 Body Control Module Run/Crank
22 Rear Electrical Center 1
23 Rear Electrical Center 2
24 Antilock Brake System
25 Body Control Module 2
26 Starter
41 Electric Power Steering
42Transmission Control Module
Battery
43Ignition Module (LE5); Injectors,
Ignition Coils Odd (LY7)
44Injectors (LE5); Injectors, Ignition
Coils Even (LY7)
45 Post Cat 02 Sensor Heaters (LY7)
46 Daytime Running Lamps
47 Center High-Mounted Stoplamp
50 Driver Power Window
52 AIR Solenoid
54 Regulated Voltage Control
55 Antilock Brake System BATT
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Electronic Immobilizer Operation
PASS-Key®III+...........................................3-17
Electronic Stability Control................................. 5-5
Electronic Stability Control Indicator Light...........4-32
Emergency Trunk Release Handle.....................3-12
Emissions Inspection and Maintenance
Programs...................................................4-36
Ending a Call.................................................4-76
Engine
Air Cleaner/Filter.........................................6-21
Check and Service Engine Soon Lamp...........4-34
Compartment Overview................................6-14
Coolant......................................................6-25
Coolant Heater............................................3-22
Coolant Temperature Gage...........................4-33
Coolant Temperature Warning Light................4-33
Cooling System...........................................6-24
Drive Belt Routing.......................................7-12
Exhaust.....................................................3-30
Oil .............................................................6-17
Overheated Protection Operating Mode...........6-30
Overheating................................................6-28
Starting......................................................3-20
Engine Cooling When Trailer Towing..................5-33
Engine Identification........................................6-96
Engine Oil
Life System................................................6-20
Engine Oil Additives / Engine Oil Flushes...........6-20Entering Personalization Menu..........................4-46
Entry/Exit Lighting...........................................4-13
Erasing Universal Home Remote Buttons...........3-40
Event Data Recorders.....................................8-16
Exiting Personalization Menu............................4-50
Express Window Anti-Pinch Feature...................3-15
Express Window Anti-Pinch Override.................3-15
Express-Down Window....................................3-14
Express-Up Window........................................3-14
Extender, Safety Belt
.......................................2-31
Exterior Mirrors...............................................1-10
F
Federal Communications Commission (FCC) and
Industry and Science Canada........................6-54
Filter
Engine Air Cleaner......................................6-21
Finding a Category (CAT) Station (XM Satellite
Radio Service Only).....................................4-56
Finding a Station............................................4-53
Finish Damage...............................................6-95
Flashers, Hazard Warning.................................. 4-3
Flash-to-Pass................................................... 4-5
Flat Tire........................................................6-66
Flat Tire, Changing.........................................6-74
Flat Tire, Storing.............................................6-84
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Headlamps Off in Park....................................4-10
Headphones...................................................4-80
Heated Seats................................................... 2-6
Heated Seats (If Equipped)................................ 1-8
Heater...........................................................4-16
Engine Coolant...........................................3-22
Highbeam On Light.........................................4-38
High-Speed Operation, Tires.............................6-52
Highway Hypnosis...........................................5-14
Hill and Mountain Roads..................................5-15
Hitches..........................................................5-30
Hood
Checking Things Under................................6-12
Release.....................................................6-13
Horn ............................................................... 4-3
How OnStar Service Works..............................1-24
How the System Alarm is Activated...................3-16
How to Add Coolant to the Radiator..................6-27
How to Add Coolant to the Recovery Tank.........6-26
How to Check................................................6-52
How to Check Power Steering Fluid..................6-31
How to Detect a Tamper Condition....................3-17
How to Inspect the Engine Air Cleaner/Filter.......6-22
How to Reset the Engine Oil Life System...........6-21
How to Turn Off the System Alarm....................3-17
How to Wear Safety Belts Properly...................2-17
Hydraulic Power Steering................................... 5-9
Hydroplaning..................................................5-14I
If a Crash Occurs...........................................8-12
If No Steam Is Coming From The Engine
Compartment..............................................6-29
If Steam Is Coming From The Engine
Compartment..............................................6-29
If the Off Indicator is Lit for an Adult-Size
Occupant...................................................2-72
If the On Indicator is Lit for a Child Restraint......2-71
Ignition Positions.............................................3-19
Ignition Transmission Lock Check....................... 7-9
Infants and Young Children, Restraints...............2-35
Inflation - Tire Pressure...................................6-51
Information Modes..........................................4-40
Instrument Panel
Brightness..................................................4-13
Cluster.......................................................4-25
Insuring Your Vehicle.......................................8-11
Interior Mirror.................................................1-10
Introduction...................................................... 7-2
J
Jump Starting.................................................6-36
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Tires.............................................................6-44
Aluminum Wheels, Cleaning..........................6-94
Buying New Tires........................................6-60
Chains.......................................................6-65
Changing a Flat Tire....................................6-74
Cleaning....................................................6-94
Compact Spare...........................................6-88
Different Size..............................................6-61
High-Speed Operation..................................6-52
If a Tire Goes Flat.......................................6-66
Inflation - Tire Pressure................................6-51
Inspection and Rotation................................6-57
Installing the Spare Tire................................6-78
Pressure Light.............................................4-34
Pressure Monitor Operation...........................6-54
Pressure Monitor System..............................6-53
Removing the Flat Tire.................................6-78
Removing the Spare Tire and Tools...............6-76
Sealant and Compressor Kit.................6-67, 6-74
Sidewall Labeling.........................................6-45
Storing a Flat or Spare Tire and Tools............6-84
Terminology and Definitions...........................6-48
Uniform Tire Quality Grading.........................6-62
Wheel Alignment and Tire Balance.................6-63
Wheel Replacement.....................................6-64
When It Is Time for New Tires......................6-59
To Use the Engine Coolant Heater....................3-22Torque Lock...................................................3-28
Total Weight on the Vehicle’s Tires....................5-30
Towing
Recreational Vehicle.....................................5-24
Towing a Trailer..........................................5-27
Your Vehicle...............................................5-24
TPMS Malfunction Light and Message...............6-55
TPMS Sensor Matching Process
.......................6-56
Traction
Control System (TCS).................................... 5-7
Traction Control Operation................................. 5-8
Traction – AA, A, B, C.....................................6-62
Trailer Brakes.................................................5-30
Transferring a Call..........................................4-76
Transmission
Fluid, Automatic...........................................6-23
Transmission Operation, Automatic....................3-23
Transportation Options...................................... 8-9
Transportation Program, Courtesy....................... 8-9
Treadwear.....................................................6-62
Treadwear 200 Traction AA Temperature A.........6-62
Trip Odometer................................................4-26
Trunk............................................................3-11
Turn and Lane-Change Signals.......................... 4-4
Turn Signal/Multifunction Lever........................... 4-4
Turn Signals When Towing a Trailer..................5-32
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