1999 Pontiac Firebird Owner's Manual - Page 150

yellowblue Ventilation For mild outside temperatures when little heating or cooling is needed, you can still direct outside air through your vehicle. 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. Rear Window Defogger The rear window defogger uses a warming grid to remove fog from the rear window. Defogging and Defrosting 1. Turn the air control knob to defrost. 2. Turn the temperature control knob to the desired setting. 3. Turn the fan control knob to the desired speed. The side window defogging works equally as well in the heater, blend and defrost modes. Press the button to turn on the defogger. An indicator light will come on to remind you that the defogger is on. The defogger will turn off automatically after about 10 minutes of use. If you turn it on again, the defogger will operate for about five minutes only. You can turn the defogger off by pressing the button again. The indicator light will go off when the system is turned off. Do not attach anything like a temporary vehicle license or a decal across the defogger grid on the rear window. 3-4