1999 Pontiac Firebird Owner's Manual - Page 151

yellowblue Your vehicle's flow-through ventilation system supplies outside air into the vehicle when it is moving. Outside air will also enter the vehicle when the blower fan is running. For mild outside temperature 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. Ventilation Tips NOTICE: Don't use a razor blade or something else sharp on the inside of the rear window. If you do, you could cut or damage the warming grid, and the repairs wouldn't be covered by your warranty. Ventilation System D Keep the hood and front air inlet free of ice, snow or any other obstruction (such as leaves). The heater and defroster will work far better, reducing the chance of fogging the inside of your windows. D When you enter a vehicle in cold weather, turn the fan control knob clockwise for a few moments before driving off. This helps clear the intake ducts of snow and moisture, and reduces the chance of fogging the inside of your windows. objects. This helps air to circulate throughout your vehicle. D Keep the air path under the front seats clear of Adjust the direction of airflow by moving the vents. 3-5