1997 Pontiac Grand Prix Owner's Manual - Page 164

Heating On cold days use FLOOR with thetemperature knob 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 coolantheater, you can use it to help your system provide warm air fasterwhen it's cold outside 0°F (- 18"C) lower. An engine coolant or heater warns the coolant your engine and heating system use to provide heat. See "Engine Coolant Heater" in the Index. Ventilation Air Conditioning with Automatic and Auxiliary Temperature Control (If Equipped) For mild outside temperatures when little heating or cooling is needed, use UPPER, with the A K button off, to direct outside airthrough your vehicle. Your vehicle also has the flow-through ventilation system described later in this section. Defogging and Defrosting Your system has two settings for clearing the front and side windows. To defrost the windows quickly, use DEFROST with the temperature knob all the way in the red area. To warm passengers while keeping the windows clean, use DEFOG. With this system, you set a "desired cabin" temperature. You can then either let the system automatically control airflow direction and amount (to maintain the desired cabin temperature) or you can manually adjust it. The system works best if you keep your windows closed while using it. 3-4