Buick PARKAVENUE 1994 Manual page 144

Defog
When the outside temperature is mild, use Defog to
keep the fog off the windshield.
Air entering the vehicle will be evenly split between the
floor outlets and the outlets near the windshield. You
can control the temperature of the air and the fan speed
to clear the foggy windows.
Rear Window Defogger
The lines you see on the
rear window warm the
glass. Press the button to
start warming your
window.
After 10 minutes, it will go off by itself, or pressing the
button again during the heating cycle will shut it off.
If you need additional warming time, push the
button again.
I
NOTICE:
Scraping the inside of your rear window could
cut and damage the heater. Your warranty would
not cover this damage. Don't put decals there,
you might have to scrape them off.
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