Pontiac 2003 Bonneville Owner's Manual page 146

There is also an EXT (exterior) temperature sensor
located behind the front grill. This sensor reads
the outside air temperature and helps to maintain the
temperature inside the vehicle. Any cover on the front of
the vehicle could cause a false reading in the
temperature.
Defogging and Defrosting
There are two modes to clear fog or frost from your
windshield. Use the defog mode to clear the windows of
fog or moisture and warm the passengers. Use the
FRONT defrost mode to remove fog or frost from the
windshield more quickly.
Press the MODE button until DEFOG appears to seiect
this function. Press the FRONT button to select the
defrost function.
DEFOG: This mode directs the air equally between the
windshield and the floor outlets.
9
FRONT (Defrost): Pressing this button directs
most of the air to the windshield and the outboard outlets
(for the side windows), with some air directed to the
floor outlets. When you select this mode, the system
turns off recirculation and runs the air conditioning
or below freezing. The recirculation mode cannot be
selected while in the FRONT defrost mode.
compressor
unless the
outside temperature is at
Rear Window Defogger
The rear window defogger uses a warming grid to
remove fog or frost from the rear window.
(@
REAR: Press this button to turn the rear window
defogger on or
off.
Be sure to clear as much snow from
the rear window as possible.
The rear window defogger will turn off approximately 10
minutes after the button is pressed. If turned on
again, the defogger will only run for approximately five
minutes before turning off. If you maintain a speed
above 30 mph (48 km/h), the rear defogger will not turn
off
automatically to help keep the rear glass clear.
The defogger can also be turned off by pressing the
button again or by turning off the engine.
If your vehicle has outside heated mirrors, the mirrors
will heat to help clear fog or frost from the surface of the
mirror when the rear window defogger button is
pressed.
Nofice:
Don't use a razor blade or something else
sharp on the inside o f the rear window. If you
do, ysu could cut or damage the defogger and the
repairs would not be covered by your warranty.
Do not attach a temporary vehicle license, tape, a
decal or anything similar to the defogger grid.
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