Buick 2009 Lucerne - Manual (Page 164)

0 (Defrost): This mode clears the windshield of fog or
frost more quickly. Air is directed to the windshield
and side window outlets. The system runs the air
conditioning compressor unless the outside temperature
is near or below freezing.
# (Air Conditioning): Press to turn the air conditioning
system on or off. An indicator light below the button
comes on to show that this mode is on. 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 H .
2. Select h .
3. Select # .
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 might drip under the
vehicle while idling or after turning off the engine.
This is normal.
h (Recirculation): Press to turn the recirculation
mode on. An indicator light below the button comes on
to show that this mode is on. This mode recirculates
and helps to quickly cool the air inside the vehicle.
It can be used to prevent outside air and odors from
entering the vehicle. This mode cannot be selected while
in the defog or defrost modes. If you try to select the
recirculation mode, the indicator light flashes three times
and turns off.
Operation in this mode during periods of high humidity
and cool outside temperatures may result in increased
window fogging. If window fogging is experienced, select
the defrost mode.
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