2005 Cadillac STS Owner's Manual - Page 182

Under some conditions, the air quality sensor system will not operate. In cold weather, the system may not be active (even if the AUTO indication is displayed) because of concerns of fogging your windows, which may occur by activating recirculation mode. Also, the air quality sensor system will not remain in recirculation mode for extended periods of time that could cause stuffy or very dry conditions in the vehicle. Following a poorly running vehicle for an extended period of time may not keep recirculation active indefinitely. The air quality sensor will not activate due to organic odors, like skunk, and may not activate on many chemical-related odors. If you wish to limit these types of odors, you may choose to manually select recirculation. Your vehicle may also be equipped with a charcoal filter that can limit many odors from being pulled into your vehicle. This filter, like your engines air cleaner filter, will need to be changed periodically. See Scheduled Maintenance on page 6-4. The air quality sensor system does not protect against carbon monoxide (CO), which you cannot see or smell. See Engine Exhaust on page 2-33. O(Power Passenger's Temperature): Press the power button located on the passenger's side of the climate control panel to turn the passenger's climate control system on if they wish to have a different setting than the driver. Turn the knob to increase or decrease the temperature for the front passenger. Turning the passenger's side power button off will not shut off the climate control system for the passenger. The system will be set to the same setting as the driver. { (Ventilated Seat): Press this button (if equipped) to turn on the ventilated seat for the driver's or passenger's side. See Heated and Ventilated Seats on page 1-4. J (Heated Seat): Press this button (if equipped) to turn on the heated seat and seatback for the driver's or passenger's side. See Heated and Ventilated Seats on page 1-4. Press this button to manually turn off the air conditioning compressor. Press AUTO to return to automatic operation or press the A/C OFF button again. To limit fogging on the windshield, the air conditioning compressor cannot be in off in defrost mode. ^ (Air Conditioning): O(Power Driver's Temperature): Press the power button located on the driver's side of the climate control panel to turn the entire climate control system on or off. Turn the knob to increase or decrease the temperature inside your vehicle. 3-50