1997 Buick Regal Owner's Manual - Page 159

BI-LEV This setting brings in outside air and directs it two ways. Half of the air is directed through the instrument panel outlets. Most of the remaining air is directed through the floor ducts and a little to the defrost and side window vents. The air conditioning compressor will run automatically in this setting unless the outside temperature is below 40°F (4°C). VENT This setting brings in outside air and directs it through the instrument panel outlets. HTR: This setting sendsmost of the air through the ducts near the floor. The rest comes out of the defroster and side window vents. BLEND: This setting allowshalf of the air to go to the floor ducts andhalf to the defroster and side window vents. The air conditioning compressorwill run automatically in this setting unless the outside temperature is below 40 O (4O C). F FRONT This setting directsmost of the air through the defroster and side window vents. Some of the air also goes to the floor ducts. The air conditioning compressor will run automatically in this setting unless the outside temperature is below 40°F (4°C). Air Conditioning On very hot days, open the windows long enough to let hot, inside air escape. Thisreduces the time for the vehicle to cool down. For a quick cool-down on very hot days, use MAX with the temperature knob 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, use NORM 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. The system 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 difference more at some times than others. 3-3