2009 Cadillac STS-V Owner's Manual - Page 204

- (Defog): This mode clears the windows of fog or moisture. Air is directed to the windshield and floor outlets, with some air directed to the side windows and outboard panel outlets. When this mode is selected, the system turns off recirculation and runs the air-conditioning compressor unless the outside temperature is at or below freezing. If recirculation is selected while in the defog mode, it is cancelled after 10 minutes. If there is fogging on the side windows, remain in defog or defrost mode until they clear. ^ (Air Conditioning): Press to turn the air conditioning off. Press AUTO to return to automatic operation. To limit fogging on the windshield, the air conditioning compressor cannot be off while in the defrost mode. h (Recirculation): Press once to select recirculation mode or twice to select outside air. If in AUTO mode, press h once to select recirculation. 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. Recirculation is not available in the defrost mode and shuts off when defog mode is selected. Both of these features are designed to limit fogging in the vehicle. If recirculation is selected during defog mode, it automatically turns off after 10 minutes. Using the recirculation for long periods of time might cause the air inside the vehicle to become too dry or stuffy. To prevent this from happening, after the air in the vehicle has cooled, press the recirculation button again to select outside air or press the AUTO button. 0 (Defrost): This mode clears the windshield of fog or frost more quickly. Air is directed to the windshield, with some air directed to the side windows and outboard panel outlets. The air-conditioning compressor runs automatically in this setting, unless the outside temperature is at or below freezing. Recirculation cannot be selected while in the defrost mode. This mode can also cause the fan speed and air temperature to increase. 3-50