Pontiac 2005 Grand Prix - Manual (Page 138)

Defogging and Defrosting
Fog on the inside of windows is a result of high humidity
(moisture) condensing on the cool window glass.
This can be minimized if the climate control system is
used properly. There are two modes to clear fog or
frost from your windshield. Use the floor/defog mode to
clear the windows of fog or moisture and warm the
passengers. Use defrost to remove fog or frost from the
windshield more quickly.
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(Floor/Defog): This mode directs the air between
the windshield, floor outlets and side windows. When
you select this mode, the system turns off recirculation
and runs the air-conditioning compressor unless the
outside temperature is near or below freezing. Pressing
the recirculation button, while in this mode, will have
no effect other than turning on the tell-tale light.
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(Defrost): This mode directs most of the air to the
windshield, with some air directed to the side windows.
IN this mode, the system will automatically turn off
the recirculation and run the air conditioning compressor,
unless the outside temperature is near or below
freezing. Pressing the recirculation button, while in this
mode, will have not effect other than turning on the
tell-tale light.
Rear Window Defogger
The rear window defogger uses a warming grid to
remove fog or frost from the rear window.
The rear window defogger will only work when the
engine is running.
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(Rear Window Defogger): Press this button to
turn the rear window defogger on and off. Be sure
to clear as much snow from the rear window as possible.
The rear window defogger will turn off approximately
20 minutes after the button is pressed. If turned on
again, the defogger will only run for approximately
20 minutes before turning off. The defogger can also be
turned off by pressing the button again or by turning
off the engine.
Do not drive the vehicle until all the windows are clear.
Notice: Don’t use anything sharp on the inside
of the rear window. If you do, you could cut
or damage the warming grid, and the repairs
wouldn’t 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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