2004 Cadillac DeVille Owner's Manual - Page 160

Sensors There is also a 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. 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. There are two modes to clear fog from your windshield. Use the floor/defog mode to clear the windows of fog or moisture and warm the passengers. Use the defrost mode (FRONT) to remove fog or frost from the windshield more quickly. The solar sensor on your vehicle monitors the solar radiation and the air inside your vehicle, then uses the information 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 middle of the instrument panel, near the windshield, or the system will not work properly. yMODE z: Press this button until the floor/defog symbol appears on the display. . (Floor/Defog): This mode directs the air equally between the windshield and 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 or below freezing. The recirculation mode cannot be selected while in the floor/defog mode. 3-34