2000 Pontiac Bonneville Owner's Manual - Page 168

When the weather is cool or damp, operating in RECIRC for extended periods of time may cause fogging of the vehicle's windows. To clear the fog, press the OUTSIDE AIR button and select either DEFOG or FRONT defrost. Be sure A/C OFF is not selected to allow the air conditioning compressor to run automatically and help dehumidify the air. OUTSIDE AIR: Press this button to allow fresh air to enter your vehicle if you currently have RECIRC selected. You may also override the system's automatic use of RECIRC by selecting OUTSIDE AIR. FRONT: Press this button to clear the windshield. The system will automatically control the fan speed if you select defrost from AUTO. If the outside temperature is 38_F (3_C) or warmer, your air conditioning compressor will automatically run to help dehumidify the air and dry the windshield. Air Conditioning 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. If you have the standard system, for quick cool-down on very hot days, use the airflow from the PANEL outlets, press RECIRC and A/C with the temperature knob in the blue area. If this max A/C setting is used for long periods of time, the air in your vehicle may become too cold and dry. For normal cooling on hot days, use A/C without RECIRC with the temperature knob in the blue area. If you have the electronic system, 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 RECIRC as necessary. On cool, but sunny days, with the standard system or through manual operation of the electronic 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, turn the TEMP knob up or down. 3-8