Chevrolet 2004 Malibu Owner's Manual page 144

When the weather is cool or damp, operating the system
in recirculation for extended periods of time may cause
fogging of the vehicle's windows. To clear the fog, select
either defog or defrost. Make sure the air conditioning is
on. You will want to allow the air conditioning to run
automatically to help dehumidify the air.
Temperature Control: Press the up and down arrows
to increase or decrease the temperature inside the
vehicle.
#
(Air Conditioning): Press this button to turn the air
conditioning compressor on and off. A light above the
button will illuminate when the air conditioning is on
When air conditioning is selected or in AUTO mode,
the system will run the air conditioning automatically to
cool and dehumidify the air entering the vehicle.
On hot days, open the windows long enough to let hot
inside air escape. This reduces the time it takes for
your vehicle to cool down. Then keep your windows
closed for the air conditioner to work its best.
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On cool, but sunny days while using manual operation
of the automatic system, use bi-level to deliver warm
air to the floor and cooler air to the instrument
panel outlets. To warm or cool the air delivered, press
the temperature buttons to the desired setting.
In AUTO mode the system will cool and dehumidify the
air inside the vehicle. Also while in AUTO mode, the
system will maximize its performance by using
recirculation as necessary.
Heating: On cold days when using manual operation of
the automatic system, choose floor mode to deliver
air to the floor outlets. To warm or cool the air delivered,
push the temperature buttons to the desired setting.
If you want to use the automatic mode, turn the knob to
AUTO and adjust the temperature by pressing the
temperature buttons.
The heater works best if you keep the windows closed
while using it.