2010 Cadillac DTS Owner's Manual - Page 205

0 (Defrost): This mode clears the windshield of fog or frost more quickly. Air is directed to the windshield and side window outlets. When selected, the system automatically turns off recirculation and runs the air conditioning compressor, unless the outside temperature is at or below freezing. Recirculation cannot be selected while in the defrost mode. Do not drive the vehicle until all the windows are clear. For professional vehicles, air will be allowed to flow through the rear outlets. For quicker defrost, press the AUX button on the front climate control system so that the light is not lit. # (Air Conditioning): Press to turn the air conditioning system on or off and override the automatic system. When in AUTO, the air conditioning compressor comes on automatically, as necessary. To avoid window fogging on rainy and humid days at temperatures above freezing, run the air conditioning. The air conditioning system removes moisture from the air, so a small amount of water may drip under the vehicle while idling or after turning off the engine. This is normal. : (Outside Air): Press to turn the outside air mode on or off. An indicator light comes on to show it is on. Air is pulled from outside the vehicle. Pressing ? will cancel this mode. ? (Recirculation): Press to turn the recirculation mode on or off. An indicator light below the button comes on to show that this mode is on. This mode recirculates and helps to quickly cool the air inside the vehicle. It can be used to prevent outside air and odors from entering the vehicle. This mode cannot be selected while in the defog or defrost modes. If you try to select the recirculation mode, the indicator light flashes three times and turns off. Operation in this mode during periods of high humidity and cool outside temperatures may result in increased window fogging. If window fogging is experienced, select the defrost mode. AUX: For vehicles with a rear climate control system, press to turn the rear climate control fan on for automatic operation. After the AUX button is pressed, the indicator light comes on. Press the button again to turn the auxiliary fan off. See Rear Climate Control System on page 4-42. PASS (Passenger Climate Control): Press to turn the passenger climate control systems on or off. When the passenger climate control system is on, the passenger temperature setting is displayed. The temperature selected by the front passenger also controls the rear system air temperature unless the rear seat passengers select their own comfort setting. If the PASS button is pressed to turn the passenger temperature setting off, the driver's temperature knob will control the temperature for the entire vehicle. 4-39