Defogging And Defrosting - Buick 2008 Lucerne Owner's Manual

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(Air Conditioning): Press this button to turn the
air conditioning system on or off. When this button
is pressed, an indicator light below the button comes on
to show that this mode is activated. Air conditioning
can be selected in any mode as long as the fan knob is
not in the off position.
On hot days during the vehicle's initial start-up, open
the windows to let hot inside air escape; then close
them. This helps to reduce the time it takes for
the vehicle to cool down. It also helps the system to
operate more efficiently.
For quicker cool down on hot days, do the following:
1. Select the vent air mode.
2. Select the recirculation mode.
3. Select the air conditioner.
4. Select the coolest temperature.
5. Select the highest fan speed.
The air-conditioning system removes moisture from the
air, so a small amount of water may drip underneath
the vehicle while idling or after turning off the engine.
This is normal.

Defogging and Defrosting

Fog on the inside of the vehicle is a result of high
humidity causing moisture to condense on the cool
window glass. This can be minimized if the climate
control system is used properly. There are two modes
to clear frost or fog from the windshield. Use the
floor/defog mode to clear the windows of condensation
and to warm the vehicle's occupants. Use the defrost
mode to remove frost or condensation from the
windshield quickly.
See "Rear Window Defogger" later in this section for
information on clearing the rear window of fog or ice.
Turn the right knob to select the defog or defrost mode.
The recirculation mode cannot be selected while in
these modes.
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(Floor/Defog): This mode directs half of the air to
the windshield and the side window outlets and half
to the floor outlets. The system runs the air conditioning
compressor unless the outside temperature is near or
below freezing.
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(Defrost): This mode directs most of the air to the
windshield and the side window outlets. The system
runs the air conditioning compressor unless the outside
temperature is near or below freezing.
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