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Automatic Operation
AUTO 9 (Automatic Fan): When this position is
selected on the fan control, the system will adjust the fan
speed. If the OnStar
®
system is activated when this
position is selected, the climate control fan speed
will lower.
AUTO (Automatic Mode):
1. Turn the fan control to the AUTO position.
2. Turn the mode control to the AUTO position.
3. Adjust the temperature to a comfortable setting
between 68°F (21°C) and 78°F (26°C).
Choosing the coldest or warmest temperature
setting will not cause the system to heat or cool any
faster. In cold weather, the system will start at
reduced fan speeds to avoid blowing cold air into
your vehicle until warmer air is available. The
system will start out blowing air at the floor but may
change modes automatically as the vehicle
warms up to maintain the chosen temperature
setting. The length of time needed to warm
the interior will depend on the outside temperature
and temperature of the vehicle.
4. Wait 20 to 30 minutes for the system to stabilize in
order for the system to regulate automatically. Then
adjust the temperature as necessary to find your
comfort setting.
Do not cover the solar sensor located in the center of
the instrument panel near the windshield. For more
information on the solar sensor, see “Sensors” later in
this section.
After your vehicle is started, the display will show
the interior temperature settings and the outside
temperature.
If the AUTO position is selected on the fan or mode
control, the system will automatically control the
air conditioning compressor. The A/C compressor will
run automatically even at cool outside temperatures
in order to dehumidify the air. The A/C indicator light will
be lit when the system is operating automatically,
even at near freezing outside temperatures. Press the
A/C button on the fan control to turn off the A/C.
For improved window clearing performance in defog or
defrost modes, the A/C compressor will run
automatically in damp cool conditions.
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