Cadillac 2008 SRX Owner's Manual page 165

PASS (Passenger's Climate Control): Press this
button to turn the passenger's climate control system on
or off. Then press the up or down buttons to choose the
desired setting. Pressing the button again automatically
sets the passengers temperature to the drivers setting.
Turning the passenger's temperature display off does not
turn off the climate control system for the passenger.
Recirculation Operation
There are three options for bringing air into the
climate control system. They are controlled by
pressing the center button on the climate control panel.
The climate control display indicates one of the following
three modes:
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(Auto Air Inlet): This mode lets the automatic
climate control system choose the best air inlet position
for cooling or warming the vehicle. To have full automatic
climate control, the fan and mode controls must be set to
the AUTO position. Generally, recirculation will only
automatically be selected on hot days.
Your vehicle may have an optional Air Quality Sensor.
To activate the air quality sensor, the auto air inlet setting
must be used. For more information, see Air Quality
Sensor found later in this section.
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(Recirculation): This mode recirculates air inside
the vehicle and keeps outside air from coming into
the vehicle. It can be used to help cool the vehicle more
quickly or to prevent odors from entering the vehicle.
Recirculation is not available in the defrost mode.
It is also cancelled when floor or defog mode is selected.
In some conditions using recirculation for long periods
of time can 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, select auto
air inlet or outside air.
:
(Outside Air): This mode pulls fresh air from
outside the vehicle. Outside air is always selected
in defrost mode to prevent fogging.
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