Buick 2012 Regal Owner's Manual page 227

Auto Defog: The climate control
system may have a sensor to
automatically detect high humidity
inside the vehicle. When high
humidity is detected, the climate
control system may adjust to
outside air supply and turn on the
air conditioner. The fan speed may
slightly increase to help prevent
fogging. If the climate control
system does not detect possible
window fogging, it returns to normal
operation. To turn Auto Defog off or
on, see Climate and Air Quality
under Vehicle Personalization on
page 5 36
Rear Window Defogger
=
(Rear Window Defogger):
Press to turn the rear window
defogger on or off.
The rear window defogger turns
off automatically after about
10 minutes. If turned on again, it
runs for about five minutes before
turning off. At higher speeds, the
rear window defogger may stay on
continuously.
For vehicles with heated outside
rearview mirrors, they turn on with
the rear window defogger and help
to clear fog or frost from the surface
of the mirror. See Heated Mirrors on
page 2 17.
Climate Controls
Do not try to clear frost
or other material from the inside
of the front windshield and rear
window with a razor blade or
anything else that is sharp. This
may damage the rear window
defogger grid and affect your
radio's ability to pick up stations
clearly. The repairs would not be
covered by your warranty.
Sensors
The solar sensor located on top of
the instrument panel near the
windshield monitors the solar heat.
The climate control system uses
the sensor information to adjust
the temperature, fan speed,
recirculation, and air delivery
mode for best comfort.
If the sensor is covered, the dual
automatic climate control system
may not work properly.
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