2001 Pontiac Aztek Owner's Manual - Page 203

BI-LEVEL: This setting directs air into your vehicle in two ways. Cooler air is directed toward your upper body through the front instrument panel outlets and the rear console outlets, while warmed air is directed through the heater ducts at your feet. LOWER: 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. This mode is particularly useful 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 (the light will glow) to send outside air into your vehicle. Using this setting while trying to defrost or defog the windows will help clear the vents of moisture. Press the RECIRCULATION button (the light on the OUTSIDE AIR button will go off) to limit outside air entering the vehicle. When the DEFOG, DEFROST or LOWER setting is selected, the system will automatically go to OUTSIDE AIR mode. RECIRCULATION: Press this button (the light will glow) to recirculate the air inside of your vehicle and to limit the amount of outside air and/or odors entering the vehicle. Press the OUTSIDE AIR button (the light on the RECIRCULATION button will go off) to let outside air circulate into the 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-fogging of the windows, operate the HVAC system in the OUTSIDE AIR mode. 3-3