2000 Buick Regal Owner's Manual - Page 150

D FLOOR: This setting sends most of the air through the ducts near the floor. The rest comes out of the defroster and side window vents. When in this setting and the RECIRC setting, the windows can fog up. See "RECIRC" in the Index. VENT is not permitted in FRONT defrost mode. If the VENT button is pushed while in FRONT defrost mode, the indicator will light for one second and then turn off. RECIRC: This setting recirculates much of the air inside your vehicle. This setting is not permitted in FRONT defrost mode and is only permitted in WINDSHIELD/FLOOR mode if the compressor is turned on. The indicator light will be lit when recirculation is engaged, but will light for one second and then turn off if selected when not permitted. Operating the climate control system in the RECIRC mode may cause fogging of the vehicles windows when the weather is cold and damp. To clear the fog, switch the system to either WINDSHIELD/FLOOR or WINDSHIELD mode and increase the fan speed. To avoid re-fogging of the windows, operate the system with RECIRC disengaged. FRONT: This setting brings in outside air and directs most of the air through the defrost vent. Some of the air also goes to the floor ducts and the side window defogger outlets. The indicator on the button will light and WINDSHIELD will be lit in the display. The air conditioning compressor will run automatically in this setting unless the outside temperature is below 40_F (4_C). VENT: This pushbutton turns the air conditioning compressor on and off. The indicator is lit when the compressor is turned off. Recirculation is not permitted when the compressor is off. The system will try to control the temperature automatically, but without the compressor. 3-7