2001 Pontiac Sunfire Owner's Manual - Page 142

If you turn it on again, the defogger will only run for about five minutes before turning off. You can also turn it off by pressing the button again. Do not attach a temporary vehicle license across the defogger grid on the rear window. Ventilation System For mild outside temperatures when little heating or cooling is needed, use vent to direct outside air through your vehicle. Your vehicle also has the flow-through ventilation system. 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 air conditioning fan is running. NOTICE: Don't use a razor blade or anything 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. 3-7