1998 Pontiac Grand Prix Owner's Manual - Page 163

Heating Air Conditioning with Automatic and Auxiliary Temperature Control On cold days FLOOR with the temperature use knob all the way in the red area.The system will bring in outside (If Equipped) a r heat i, it and sendit to the floor ducts. you If your vehicle has an engine coolant heater, can use it to help your system provide warm faster when it's air cold outside0O F (- 18 C) or lower. An engine coolant heater warms the coolant your engine and heating system use to provide heat. "Engine Coolant See Heater" in the Index. O Ventilation For mild outside temperatures when little heating or cooling is needed, useUPPER, with the A/C button off, to direct outside through your vehicle.Your vehicle air 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 defiost the windows quickly, use DEFROST with the temperature knob all the way in the red area. To warm passengers while keeping the windows clean, useDEFOG. With this system, you set a "desired cabin" temperature. You can then either the system automatically control let airflow direction and amount maintain the desired (to cabin temperature)or you can manually adjust it. The system works best you keep your windows closed if while using it. 3-4