1997 Buick Regal Owner's Manual - Page 162

Air Conditioning On very hot days, open the windows long enough to let hot, inside air escape. This reduces the time for the vehicle to cool down. For a quick cool-down on very hot days, use MAX with the temperature knobs 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 knobs in the blue area. The system will bring in outside air and cool it. sun On cool, but sunny days, the may warm your upper body, but your lower body may not be warm enough. You can use BI-LEV and set the temperature knob toa 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. If your vehicle has an engine coolant heater, you can use it to help your system provide warm air faster when it's cold outside (0°F (-18°C) or lower). An engine coolant heater warms the coolant your engine and heating system use to provide heat. See "Engine Coolant Heater" in the Index. Ventilation For mild outside temperatures when little heating or cooling is needed,use VENT to direct outside air through your vehicle. Your vehicle also has the flow-through ventilation system described later in this section. Defogging and Defrosting Your system has two settingsfor clearing the front and side windows. To defrost the windows quickly,use FRONT. For maximum defroster performance, set both driver and passenger temperature controls to the warmest setting. To warm passengers while keeping the windows clear, use BLEND. Heating On cold days, use HTR with the temperature knobs all the way in the red area. The system will bring in outside air, heat it and send it to the floor ducts. 3-6