2005 Buick LeSabre Owner's Manual - Page 136

Sensors The solar sensor on your vehicle monitors the solar radiation and the air inside of your vehicle. This information is then used to maintain the selected temperature by initiating needed adjustments to the temperature, the fan speed, and the air delivery system. The system may also supply cooler air to the side of the vehicle facing the sun. The recirculation mode will also be activated, as necessary. Do not cover the solar sensor located in the center of the instrument panel, near the windshield, or the system will not work properly. Rear Window Defogger The rear window defogger uses a warming grid to remove fog or frost from the rear window. = REAR (Rear Window Defogger): 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. At speeds above 35 mph (55 km/h), the defogger will operate continuously until you press the REAR button again. After 10 minutes of driving below 35 mph (55 km/h), the defogger will turn off automatically. If you need additional warming time, push the button again. The system will then operate for five minutes before going off by itself. If your vehicle has heated outside rearview 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. Defogging and Defrosting Fog on the inside of windows is a result of high humidity (moisture) condensing on the cool window glass. This can be minimized if the climate control system is used properly. This mode allows you to clear fog or frost from your windshield. 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. In this mode, the system will automatically turn off recirculation and run the air conditioning compressor, unless the outside temperature is at or below freezing. Recirculation cannot be selected while in FRONT defrost mode. Do not drive the vehicle until all the windows are clear. 3-26