Cadillac 2005 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 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
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.
^
(Air Conditioning): 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.