Cadillac 1996 DeVille Owner's Manual page 156

(@
Rear Window Defogger
The lines you see on the rear window warrn the glass.
Press the button to turn on the rear defogger. With it,
the rear window and both outside rearview mirrors are
heated. The system will automatically shut off after
10 minutes. If further defogging is desired, press the
button again.
Do not attach a temporary vehicle license, tape or decals
across the defogger grid on the rear window.
NOTICE:
Scraping the inside of your rear window could
cut and damage the heating grids. Your warranty
would not cover this damage. And don't put
decals there; you might have to scrape them off.
Steering Wheel Controls for
Climate Control
Some heating and cooling
controls can be adjusted at
the steering wheel. Other
touch controls operate
some audio controls. See
"Steering Wheel Controls
for Audio System'' later in
this section.
#
FAN SPEED: Press the up arrow lever to increase
the fan speed and the down arrow lever to decrease
fan speed.
TEMP: Press the up arrow lever to increase
the temperature and the down arrow lever to
decrease temperature.