Pontiac 2002 Aztek Owner's Manual page 198

(Floor): This setting brings in most of the air
through the floor ducts. This setting is also used to send
air to the rear of the vehicle. Keep the area under the
front seats free of objects that could obstruct airflow to
the rear of the vehicle.
(Defog): This setting directs air to the windshield
and through the floor ducts. Use this mode during cold
or inclement weather because of your vehicle's larger
windshield area.
(Defrost): This setting directs most of the air to the
windshield and side window vents.
Mode Buttons
(Outside Air): Press this button to send outside
air into your vehicle. The light in the button will glow
when outside air is in use. Using this setting while trying
to defrost or defog the windows will help clear the vents
of moisture. While floor, defog or defrost mode is
selected, the system will automatically go to outside
air mode.
(Recirculation): Press this button to limit the
amount of outside air entering your vehicle. The light in
the button will glow when recirculation is in use. You
may use this setting to limit odors entering your vehicle.
Operating the Heating/Ventilation/Air Conditioning
(HVAC) system in the recirculation mode may cause
fogging of the vehicle's windows when the weather is
cold and damp. To clear the fog, switch the HVAC
system to either the defog or defrost mode and increase
the fan speed. To avoid re
operate the HVAC system in the outside air mode.
A/C (Air Conditioning): Press this button to turn
the air conditioning compressor on and off. The light in
the button will glow when the air conditioning is in use.
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fogging of the windows,
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