Buick LaCrosse Owner's Manual page 265

(Defog): Clears the windows of
fog or moisture. Air is directed to the
windshield and floor outlets.
(Defrost): Clears the
windshield of fog or frost more
quickly. Air is directed to the
windshield. Selecting defrost will
disable automatic control.
For best results, clear all snow and
ice from the windshield before
defrosting.
(Air Conditioning): Press to
turn the air conditioning system on
or off. If the fan is turned off or the
outside temperature falls below
freezing, the air conditioning system
will not run.
Pressing this button cancels
automatic air conditioning and turns
off the air conditioner. Press AUTO
to return to automatic operation
and the air conditioner runs
automatically as needed. When the
indicator light is on, the air
conditioner runs automatically to
cool the air inside the vehicle or to
dry the air needed to defog the
windshield faster.
(Recirculation): Press to
alternate between recirculating air
inside the vehicle or pulling in
outside air. When the indicator light
is on, air is being recirculated inside
the vehicle. This helps to quickly
cool the air inside the vehicle or
prevent outside air and odors from
entering.
Pressing this button cancels
automatic recirculation. Press AUTO
to return to automatic operation and
recirculation runs automatically as
needed.
Climate Controls
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. The defogger can also
be turned off by turning the ignition
to ACC/ACCESSORY or
LOCK/OFF.
The rear window defogger can be
set to automatic operation. See
Climate and Air Quality under
. When auto rear defog is
selected, the rear window defogger
turns on automatically when the
interior temperature is cold and the
outside temperature is about 4°C
(40°F) and below. The auto rear
defogger turns off automatically
after about 10 minutes, or after
five minutes if the outside
temperature is not as cold.
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