2002 Pontiac Aztek Owner's Manual - Page 202

Defogging and Defrosting To rapidly defrost the windshield, move the temperature control to the red area and turn the mode knob to defrost. Adjust the fan to the highest speed. To keep the windshield clear and bring in heated air through the floor ducts, turn the mode knob to defog. When the temperature outside is above freezing, the air conditioner compressor will run in these settings to help remove moisture from the air. Your vehicle is equipped with side window defogger vents located on the top of the instrument panel. For additional side window defogging, turn the mode knob to the bi-level setting and adjust the fan to the highest speed. Aim the side vents on the instrument panel toward the side windows. For increased airflow to the side vents, close the center vents. Operating the 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. For additional information, refer to "Recirculation" earlier in this section. Rear Window Defogger Press the REAR button to warm the defogger grid on the rear window. The engine must be running for the defogger grid to warm up. The system will turn off automatically after about 10 minutes of use. If you turn it on again, the defogger will operate for about five minutes. You can also turn the defogger off by turning the ignition to OFF or by pressing the button again. Do not attach a temporary vehicle license across the defogger grid on the rear window. 3-7