1998 Pontiac Firebird Owner's Manual - Page 149

Heating Ventilation or The heater works best if you keep your windows closed For mild outside temperatures when little heating while using it. cooling is needed, you can still direct outside air through your vehicle. 1. Turn the air control knob to heater. 2. Turn the fan control knobto the desired speed. 3. Turn the temperature control knob to a comfortable setting. During initial start-up only, your vehicle is equipped if with an optional engine coolant heater, can useit in you cold weather (around2OoF/-8"C or lower) to improve heater performance on start up.See "Engine Coolant Heater" in the Index. Bi-Level Heating 1. Turn the air control knob to vent. 2. Turn the temperature control knob to a comfortable setting. 3. Turn the fan control knob to the desired speed. Defogging and Defrosting 1. Turn the air control knob to defrost. 2. Turn the temperature control knob to the desired setting. You may want to use bi-level heating on cool, but sunny days. This setting directs cool air toward your body and warmer air toward your feet. 1. Turn the air control knobto bi-level. 2. Turn the temperature control knob to a comfortable setting. 3. Turn the fan control knob to the desired speed. 3. Turn the fan controlknob to the desired speed. 3-4