Cadillac 2001 Catera Owner's Manual page 157

DEFROST: This setting sends most of the airflow
to the windshield with only a small amount to the
floor outlets. Press this button to quickly remove fog or
frost from the windshield (the fan works in high
FAN SPEEDS: Press the driver's side
TEMP/AUTO knob to set the fan speed for AUTO.
In this setting, the fan speed is automatically controlled.
If it is cold outside, the fan may not run in the maximum
high fan speed right away. The system checks the
temperature of the engine coolant to assure it is warm
enough to provide heat. When the engine coolant is
warm, the controller allows the fan to gradually increase
to a higher speed. This prevents cold air from blowing
into the passenger compartment. If you want the fan at a
high speed, press the up arrow button until you reach the
highest position of the display. If you want the fan at a
low speed, press the down arrow button until the lowest
position is displayed.
ON/OFF: Press this button to turn the system on or off.
Turning the climate control system on in this way will
recall all previous manually set mode settings.
If the system is turned on by pushing the driver's
TEMP/AUTO knob for automatic operation, all of the
previous manually set mode settings will be changed
back to the fully automatic mode.
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speed).
AC: Press this button to turn the air conditioning on and
off. The system will cool and dehumidify the air inside
the vehicle. In the automatic operation mode, the display
will show AC OFF when the air conditioning has been
turned off.
RECIRCULATION: Press this button to limit
the amount of outside air entering your vehicle.
This is helpful to limit odors entering your vehicle.
In the automatic operation mode, the system will
use recirculation as necessary to cool the air.
Pressing the recirculation button will change the
operation to a manual mode and the air will recirculate
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non stop. Press this button again to turn off the
recirculation feature.
If you notice the windows fogging, press the
recirculation button to exit the recirculation mode.
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