Buick 2006 Rainier - Manual (Page 144)

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A/C (Air Conditioning): Press this button to
manually turn the air conditioning system on or off.
When the system is on, the system will automatically
begin to cool and dehumidify the air inside of your
vehicle. The air conditioning symbol will appear on the
display when the air conditioning is on and will turn
off when the air conditioning is off.
If you select turn the air conditioning off while in front
defrost or defog mode, the air conditioning symbol
will turn off, however, the A/C compressor will remain
on to help de-humidify the air inside the vehicle.
If one of the other modes is selected the compressor
will then turn the A/C off until it is selected again or
the AUTO button is pressed.
To avoid fogging the inside glass on rainy and humid
days at temperature above freezing, press the
air-conditioning button to run the air conditioning
compressor. Also, it is best to avoid the use of
recirculation mode except when maximum air
conditioning performance is needed or for short times
to avoid exterior odors.
You may notice a slight change in engine performance
when the air-conditioning compressor shuts off and
turns on again. This is normal.
Defogging and Defrosting
Fog on the inside of windows is a result of high
humidity (moisture) condensing on the cool window
glass. This can be minimized if the climate control
system is used properly. You can use either defog or
front defrost to clear fog or frost from your windshield.
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(Defog): Use this setting to clear the windows of
fog or moisture. This setting will deliver air to the
floor and windshield outlets.
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(Front Defrost): Press the front defrost button
to clear the windshield and side windows of frost or
fog quickly. The system will automatically control the
fan speed if you select defrost from AUTO mode.
If the outside temperature is 40°F (4°C) or warmer,
your air conditioning compressor will automatically run
to help dehumidify the air and dry the windshield.
Do not drive the vehicle until all the windows are clear.
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