2004 Buick Regal Owner's Manual - Page 121

For quick cool down on hot days, press the AUTO button. The system will automatically enter the recirculation mode where the temperature will be at the full cold position for maximum cooling. The air-conditioning system removes moisture from the air, so a small amount of water dripping underneath the vehicle while it is idling or after the engine is turned off is normal. Operating the climate control system in the RECIRC mode may cause fogging of the vehicle's windows when the weather is cold and damp. To clear the fog, select either WINDSHIELD/FLOOR or defrost mode and increase the speed. Passenger Control The arrow buttons to control the temperature on the passenger side of the vehicle are located to the right of the PASSENGER CONTROL window. Press the DUAL button so that the indicator light is on. Press the right arrow to raise the temperature and press the left arrow to lower the temperature on the passenger side of the vehicle. • If the indicator light below the arrows is amber this indicates that the passenger side temperature is set the same as the driver's side. • If the indicator light below the arrows is red, this indicates that the passenger side temperature is set warmer than that of the driver's side. Sensors The solar sensor on the vehicle monitors the solar heat and the air inside of the vehicle. This information is used to maintain the selected temperature by regulating 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. • If the indicator light below the arrows is blue this indicates that the passenger side temperature is set cooler than that of the driver's side. Defogging and Defrosting Fog on the outside of the windows is a result of high humidity causing moisture to form and condense 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 the windshield and side windows. 3-23