2009 PONTIAC G8 radiator

Rear Window Defogger
The rear window defogger uses a
warming grid to remove fog or
frost from the rear window. It only
works when the ignition is in
ON/RUN.
The rear window defogger will
only work when the ignition is in
ON/RUN.
+(Rear Window Defogger):
Press to turn the rear window
defogger on or off. The
+indicator
appears in the display. The rear
window defogger turns off
automatically if it is left on.
Notice:Do not use anything
sharp on the inside of the rear
window. If you do, you could cut
or damage the warming grid, and
the repairs would not be covered
by the vehicle warranty. Do not
attach a temporary vehicle
license, tape, a decal or anything
similar to the defogger grid.
EXT TEMP
EXT TEMP (Exterior Temperature):
Press EXT TEMP to show the
temperature outside the vehicle or
the normal display.
Pressing any other climate control
button will change the display from
showing the outside temperature to
showing the normal display.
The units for the EXT TEMP can be
displayed in °F or °C. SeeDIC
Vehicle Customization on page 4-31.
Sensors
The climate control system uses
three different sensors to maintain
the desired temperature. The
solar sensor is located on the
instrument panel, near the
windshield. The interior temperature
sensor is located on the instrument
panel near the steering wheel
and the outside temperature sensor
is in front of the radiator.By monitoring the solar radiation,
the air inside the vehicle and
air moving across the outside
sensor, the selected temperature
can be maintained while using
the AUTO mode by adjusting the
temperature, fan speed, and
air delivery system. The system
may also supply cooler air to
the side of the vehicle facing the
sun. The recirculation mode will
also be activated, as necessary.
Do not cover the sensors or
the automatic climate control
system will not work properly.Remote Start Climate Control
Operation
For vehicles with the remote start
feature and it is activated, the climate
control system will automatically set
the temperature to 73°F (23°C).
When the ignition is turned to
ON/RUN the climate control system
heats and cools the inside of the
vehicle using the modes that
were set before the vehicle was
turned off.
7-8 Climate Controls

Engine Compartment Overview
When you open the hood, this is what you will see:A.
Engine Compartment Fuse Block
on page 9-38 .
B. Coolant Reservoir and Dipstick. See Cooling System on
page 9-13 .
C. Engine Oil Fill Cap. See “When to Add Engine Oil” under Engine
Oil on page 9-8 .
D. Engine Oil Dipstick (Out of View). See “Checking Engine Oil” under
Engine Oil on page 9-8 .
E. Brake Master Cylinder Reservoir. See “Brake Fluid” under Brakes
on page 9-25 .
F. Power Steering Reservoir. See Power Steering Fluid
on page 9-21 .
G. Engine Air Cleaner/Filter on
page 9-11 .
H. Windshield Washer Fluid Reservoir. See Windshield
Washer Fluid on page 9-23 .
I. Radiator Pressure Cap. See Cooling System on page 9-13 .
V6 Engine
9-6 Vehicle Service and Care

A.Engine Compartment Fuse Block
on page 9-38 .
B. Coolant Reservoir and Dipstick. See Cooling System on
page 9-13 .
C. Engine Oil Dipstick. See “Checking Engine Oil” under
Engine Oil on page 9-8 .
D. Engine Oil Fill Cap. See “When to Add Oil” under Engine Oil on
page 9-8 .
E. Power Steering Reservoir. See Power Steering Fluid
on page 9-21 .
F. Brake Master Cylinder Reservoir. See “Brake Fluid” under Brakes
on page 9-25 .
G. Engine Air Cleaner/Filter on
page 9-11 .
H. Windshield Washer Fluid Reservoir. See Windshield
Washer Fluid on page 9-23 .
I. Radiator Pressure Cap. See Cooling System on page 9-13 .
V8 Engine
Vehicle Service and Care 9-7

Cooling System
When you decide it is safe to lift the hood, this is what you see:
A. Engine Coolant Reservoir
B. Radiator CapV6 Engine
Vehicle Service and Care 9-13

A. Engine Coolant Reservoir
B. Radiator Cap
{CAUTION
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.
V8 Engine
9-14 Vehicle Service and Care

{CAUTION
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 re, and you
could be burned. Get any leak
xed 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 30,000 miles
(50 000 km) 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
lled with DEX-COOL®engine
coolant. This coolant is designed to
remain in the vehicle for ve years
or 150,000 miles (240 000 km),
whichever occurs rst.
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 9-20.
Vehicle Service and Care 9-15

What to Use
{CAUTION
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 re 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.
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 11-12for
more information.
9-16 Vehicle Service and Care

How to Add Coolant to the
Radiator
{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.
Notice:This vehicle has a
specic coolant ll procedure.
Failure to follow this procedure
could cause the engine to
overheat and be severely
damaged.
{CAUTION
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.
{CAUTION
Steam and scalding liquids from a
hot cooling system can blow out
and burn you badly. They are
under pressure, and if you turn
the radiator pressure cap — even
a little — they can come out at
high speed. Never turn the cap
(Continued)
CAUTION (Continued)
when the cooling system,
including the radiator pressure
cap, is hot. Wait for the cooling
system and radiator pressure cap
to cool if you ever have to turn
the pressure cap.
If coolant is needed, add the proper
mixture directly to the radiator,
but be sure the cooling system is
cool before this is done.
9-18 Vehicle Service and Care