1998 Buick Century Owner's Manual - Page 148

FRONT This settingdirects most of the air through the defrosterand side window vents. Some of the airgoes to the floor ductsand the side window vents. The airconditioning compressor will run automatically in this setting unless the outside temperature is below 40°F (4°C). (Even when the compressor is running, you can control the temperature.) Heating On cold days, useHTR with the temperature knob and lever all the way in the red area. The system will bring in outside air, heat it and send it to the floor ducts. 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. Air Conditioning On very hot days, open the windows long enough to let hot, inside airescape. This reduces the time forthe vehicle to cool down. For a quick cool-down on very hot days, useMAX with the temperature knobs all the way in the bluearea. If this setting is used for longperiods of time, the air in your vehicle may become too dry. For normal cooling on hot days, useNORM with the temperature knobs in the blue area. The system will bring in outsideair and cool it. On cool, but sunny days, thesun 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. Ventilation For mild outside temperatures, when little heating or cooling is needed, use VENT to direct outsideair through your vehicle. Your vehiclealso has the flow-through ventilation system described later this section. in Defogging and Defrosting Your system has two settings clearing the front and for side windows. To defrost the windows quickly, FRONT with use the temperature knob all the way in the red area. For maximum defroster performance, set both driver and passenger temperature controls to the warmest setting. To warmpassengers while keeping the windows clear, use BLEND.