Chevrolet 2001 Impala Owner's Manual page 173

LOWER: This setting sends most of the air
through the ducts near the floor. The remaining air
comes out of the defroster and side window outlets.
The RECIRCULATION button cannot be selected
in this mode.
DEFOG: This setting sends half of the air
to the floor ducts and half to the defroster and side
window outlets. The air conditioning compressor will
run automatically in this setting unless the outside
temperature is below 40 _ F (4 _ C). The air inlet
will also be automatically set to outside air. The
RECIRCULATION button cannot be selected in
this mode.
DEFROST: This setting directs most of the air
through the defroster and side window vents. Some of
the air also goes to the floor ducts. The air conditioning
compressor will run automatically in this setting unless
the outside temperature is below 40 _ F (4 _ C). The
air inlet will also be automatically set to outside air.
The RECIRCULATION button cannot be selected
in this mode.
OUTSIDE AIR: Press this button to force the
system to use outside air. This button is usable with all
of the mode settings. An indicator on the button will
light up when this button is selected.
RECIRCULATION: Press this button to limit
the amount of outside air entering your vehicle. This is
helpful when you are trying to limit odors entering your
vehicle. This button is usable in UPPER and BI
modes. An indicator on the button will light up when
this button is selected. The system will default back to
the outside air setting, so you will have to reselect this
setting every time you restart your vehicle.
While in the RECIRCULATION mode the system
may cause fogging of the windows when the weather
is cold and damp. To clear the fog, select either the
DEFOG or DEFROST mode and increase the fan
speed. To avoid refogging of the windows, use the
OUTSIDE AIR setting.
A/C: Press this button to turn the air conditioning
on and off. The system will cool and dehumidify the air
inside the vehicle when the A/C light and the fan are on.
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LEVEL
3-3