1998 Buick Century Owner's Manual - Page 146

.. ang u n cold days, use HTR with the temperature knob all the way in thered area. The system will bring in outside air, heat it and send it to the floor ducts. If your vehicle has an engine coolantheater, you can use it to help your system provide warm air fasterwhen it's or cold outside (0°F (- 18"C) lower). An engine coolant heater warms the coolant your engine and heating system use to provide heat. See "Engine Coolant Heater" in the Index. Dual ComforTemp Climate Control (If Equipped) 0 I looooom[1oool PASSENGER TEMP 1 C T ) ( 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. Defogging and Defrosting Your system has two settings for clearing the frontand 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. Fan Control The leftknob labeled FAN controls the fan speed selection. If the airflow seems very low when the knob is turned fan to the highest setting regardless of the mode setting, your passenger compartment air filter may need to be replaced. See "Maintenance Schedule" in the Index. 3-4