2005 Pontiac Bonneville Owner's Manual - Page 143

There is also an EXT (exterior) temperature sensor located behind the front grill. This sensor reads the outside air temperature and helps to maintain the temperature inside the vehicle. Any cover on the front of the vehicle could cause a false reading in the temperature. or below freezing. The recirculation mode cannot be selected while in the FRONT defrost mode. Do not drive the vehicle until all the windows are clear. Rear Window Defogger The rear window defogger uses a warming grid to remove fog or frost from the rear window. Defogging and Defrosting Fog on the inside of windows is a result of high humidity, or moisture, condensing on the cool window glass. This can be minimized if the climate control system is used properly. There are two modes to clear fog or frost from your windshield. Use the defog mode to clear the windows of fog or moisture and warm the passengers. Use the FRONT defrost mode to remove fog or frost from the windshield more quickly. Press the MODE button until DEFOG appears to select this function. Press the FRONT button to select the defrost function. DEFOG: This mode directs the air equally between the windshield and the floor outlets. = REAR: Press this button to turn the rear window defogger on or off. Be sure to clear as much snow from the rear window as possible. The rear window defogger will turn off about 10 minutes after the button is pressed. If turned on again, the defogger will only run for about five minutes before turning off. If you maintain a speed above 30 mph (48 km/h), the rear defogger will not turn off automatically to help keep the rear glass clear. The defogger can also be turned off by pressing the button again or by turning off the engine. If your vehicle has outside heated mirrors, the mirrors will heat to help clear fog or frost from the surface of the mirror when the rear window defogger button is pressed. Notice: Using a razor blade or sharp object to clear the inside rear window may damage the rear window defogger. Repairs would not be covered by your warranty. Do not clear the inside of the rear window with sharp objects. 3-31 1 FRONT (Defrost): Pressing this button directs most of the air to the windshield and the outboard outlets for the side windows, with some air directed to the floor outlets. When you select this mode, the system turns off recirculation and runs the air conditioning compressor unless the outside temperature is at