Buick 2001 Regal Owner's Manual page 156

Automatic Control
For the most efficient operation, you should set the
system temperature and press AUTO. The system will
select the best fan speed and airflow settings to keep you
comfortable. The air conditioning compressor will run if
the outside temperature is above 40 _ F (4 _ C). You may
notice a delay of two to three minutes before the fan
comes on at start up in cool weather.
Temperature Control
The TEMP switch sets the temperature for the entire
system when the light on the DUAL button isn't lit.
If the DUAL button light is lit, this master temperature
control sets the temperature for the driver only. Press the
up arrow to raise the temperature and press the down
arrow to lower the temperature. The display will show
your selection for a few seconds, then the outside
temperature will be displayed. If you push the AUTO
button, the system will control the fan speed and airflow.
For the automatic system to function, the temperature
must be set between 61 _ F (16 _ C) and 89 _ F (31 _ C).
The driver's temperature and passenger's temperature
settings will be automatically maintained even if manual
overrides have been selected except for settings at
60 _ F (15 _ C) and 90 _ F (32 _ C).
Setting the temperature to 90 _ F (32 _ C) will lock control in
full hot, direct air to the floor, and increase the fan speed to
high. The system will not return to automatic temperature
control until the temperature setting is lowered.
Setting the temperature to 60 _ F (15 _ C) will lock control
in full cold, recirculate interior air, direct air to outlets
on the panel and increase blower speed to high. The
system will not return to automatic temperature control
until the temperature setting is raised.
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