Pontiac 2007 G6 Owner's Manual page 190

Temperature Control: Press the up and down
arrows to increase or decrease the temperature
inside the vehicle.
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(Air Conditioning): Press this button to turn
the air conditioning compressor on and off. A
light above the button will come on while the air
conditioning is on.
When air conditioning is selected or in AUTO
mode, the system runs 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 the
windows closed for the air conditioner to work
its best.
190
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, 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.