2008 Cadillac STS Owner's Manual - Page 205

Under some conditions, the air quality sensor system does not operate. In cold weather, the system might not be active (even if AUTO is displayed) because of concerns of fogging your windows, which may occur by activating recirculation mode. Also, the air quality sensor system does 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 does 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, manually select recirculation. Your vehicle could also have a charcoal filter that can limit many odors from being pulled into your vehicle. This filter needs 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 2-38. 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 is set to the same setting as the driver. { (Ventilated Seat): Press this button, to turn on the driver or passenger's side ventilated seat, if the vehicle has this feature. See Heated and Ventilated Seats on page 1-3. J (Heated Seat): Press this button, to turn on the driver or passenger's side heated seat and seatback, if the vehicle has this feature. See Heated and Ventilated Seats on page 1-3. ^ (Air Conditioning): Press this button to manually turn off the air conditioning compressor. 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. 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 the vehicle. 3-51