Defogging And Defrosting; Rear Window Defogger - Buick 2004 Park Avenue Owner's Manual

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.
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FRONT: Press the FRONT button to defrost the
windshield by directing airflow toward the windshield
and outboard outlets (for the side windows). To turn off
FRONT, press the AUTO or AIR FLOW buttons.
If the AIR FLOW up button is pressed while in the
FRONT defrost mode, the system will direct the
air toward the instrument panel outlets. If the AIR FLOW
down button is pressed while in the FRONT defrost
mode, the system will direct the air toward the floor, and
the FRONT defrost mode will cancel. Do not drive the
vehicle until all the windows are clear.

Rear Window Defogger

The rear window defogger uses a warming grid to
remove fog or frost from the rear window.
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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.
At speeds above 30 mph (48 km/h), the defogger
will operate continuously until you press the REAR
button again. After 10 minutes of driving below
30 mph (48 km/h), the defogger will turn off
automatically. If you need additional warming time,
push the button again. The system will then operate
for five minutes before going off by itself.
If your vehicle has heated outside rearview 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.
Notice: Using a razor blade or sharp object to
clear the inside rear window may damage the rear
window defogger. Repairs would not be covered
by your warranty. Do not clear the inside of the
rear window with sharp objects.
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