1997 Buick Century Owner's Manual - Page 148

Heating On cold days, use HTR with the temperature knob all the way in the red area. The system will bring in outside air, heat it and send it to the floor ducts. Dual ComforTemp Climate Control (If Equipped) 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 (OOF (- 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. With this system, the driver and passenger can maintain separate temperatures. The system works best if you keep your windows closed while using it. Fan Control The left knob labeled FAN controls the fan speed selection. Defogging and Defrosting Your system has two settings for clearing the front and side windows. To defrost the windows quickly, use FRONT with the temperature knob all the way in the red area. To warm passengers while keeping the windows clear, use BLEND. If the airflow seems very low when the knob is turned fan to the highest setting regardless of the mode setting, your passenger compartmenta r filter may needto be replaced. i See "Maintenance Schedule'' in Index. the 3-4