1997 Buick Century Owner's Manual - Page 153

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 indicatoron the button will light and WINDSHIELD will be lit in the display. The air conditioning compressor will run automatically in this settingunless the outside temperature is below 40°F (4°C). Air Conditioning On very hot days, open the windows long enoughto let hot, inside air escape. This reduces time for the the vehicle to cooldown. For a quick cool-down on very hot days, use MAX with the temperatureknob all the way in the blue area.If this setting is used for long periods of time, the air in your vehicle may become too dry. For normal cooling on hot days, useNORM with the temperature knob in the blue area. Thesystem will bring in outside air and cool it. On cool, but sunny days, the sun may warm your upper body, but your lower body may not be warm enough. You can use BI-LEV and set the temperature knob to a comfortable setting. Thesystem will bring in outside air and direct it to your upper body, while sending slightly warmed air to your lower body. You may notice this temperature differencemore at some times than others. VENT This pushbutton turns the air conditioning when compressor on and off. The indicator lights the compressor is turned off. Recirculation is not permitted when the compressor is off. The system will try to control the temperatureautomatically, but without the compressor. RECIRC: This setting recirculatesmuch of the air insideyour vehicle. This setting is permitted not in FRONT defrostmode and is only permitted in WINDSHIELD/FLOOR mode if the compressor is turned on. The indicatorlight will be lit when Recirculation is engaged, but will light forone second and then turn off if selected when not permitted. 3-9