2004 Pontiac Grand Prix Owner's Manual - Page 132
2004 Pontiac Grand Prix Manual
Page 132 highlights
Recirculation h(Recirculation): Press this button on the climate control panel to activate the recirculation mode. With this selection inside air is recirculated into the vehicle along with some outside air. This mode reduces outside air and odors from entering your vehicle. It may also help to heat or cool the air inside your vehicle more quickly. When this button is pressed an indicator lamp to the right of the button will come on to indicate that the recirculation mode is on. An adjustment to the instrument panel brightness control to the highest setting may be required to see the indicator lamp. The recirculation mode has a timer. After five minutes, the system's air inlet door will move slightly to allow for ten percent fresh outside air to maintain interior air quality. The only way to reset the system to full recirculation is to restart the five minute timer by selecting vent/outside air and recirculation again. Rear Window Defogger The rear window defogger uses a warming grid to remove fog or frost from the rear window. Be sure to clear as much snow from the rear window as possible. 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 defogger and the repairs would not be covered by your warranty. Do not attach a temporary vehicle license, tape, a decal or anything similar to the defogger grid. =(REAR): Press this button to turn the rear window defogger on or off. When this button is pressed an indicator light to the right of the button will come on to show that the rear window defogger is active. The instrument brightness control may have to be adjusted to the highest setting during the daytime in order to see the indicator light. The rear window defogger will turn off approximately 20 minutes after the button is pressed. If reselected, it will run another 20 minutes. The defogger can be turned off by pressing the button again or by turning off the engine. Do not drive the vehicle until all windows are clear. 3-28