Buick 2003 Century Owner's Manual page 128

Defogging and Defrosting
@
DEF (Defrost): This setting, located on the right
knob, directs most of the air through the defroster
and the side window outlets. Some of the air is directed
to the floor and side window outlets. The air-conditioning
compressor will run automatically in this setting unless
the outside temperature is below 40°F (4°C).
To defrost the window quickly, turn the mode knob to
the defrost setting and turn the driver's and passenger's
temperature levers all the way to the red area.
To warm passengers while keeping the windows clear,
use BLEND.
Rear Window Defogger
@
(Rear): Press the button to turn the defogger on.
The rear window defogger will shut off after about
15 minutes. If you turn it on again, the rear window
defogger will only run fur about seven and one
half minutes before turning off. You can
also
turn it off
by pressing the button again.
Notice: Don't use a razor blade or something else
sharp on the inside of the rear window. If you
do, you 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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