GMC Cadillac CTS 2004 Owner's Manual page 151

Using recirculation for long periods of time may cause
the air inside your vehicle to become too dry or stuffy.
To prevent this from happening, after the air in your
vehicle has cooled, turn the recirculation mode off.
Q R
PWR (Power/Driver's Temperature): Press the
PWR button located on the driver's side of the
climate control panel to turn the entire climate control
system on or off. Press the up or down arrow on
the switch to increase or decrease the temperature
inside your vehicle.
Q R
PWR (Power/Passenger's Temperature): Press
the PWR button located on the passenger's side of
the climate control panel to turn the passenger's climate
control system on. Press the up or down arrow on
the switch to increase or decrease the temperature for
the front passenger.
A/C OFF (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.
Sensors
There is a solar sensor located on the instrument panel,
near the windshield.
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