Buick 2007 LaCrosse Owner's Manual page 173

Automatic Operation
AUTO (Automatic): Press the AUTO button for
automatic control of the inside temperature, the air
delivery mode, and the fan speed. There might
be a delay of two to three minutes before the fan
comes on when the automatic operation is
used in cold weather. For the automatic system to
function, the temperature must be set between
61°F (15°C) and 89°F (32°C).
1. Adjust the temperature to a comfortable
setting.
2. Press the PASS button or the up or down
arrows on the passenger side to turn the
passenger temperature set on and off. When
turned on, the passenger temperature will
be the same as the driver setting. Press the
up or down arrow on passenger side to adjust
the passenger temperature setting.
When the passenger's temperature set is off,
the passenger display will be off and the
driver's set temperature will be for the driver
and passenger.
In cold weather, the system will start at
reduced fan speeds to avoid blowing cold air
into the 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
for warm up will depend on the outside
temperature and the length of time that has
elapsed since the vehicle was last driven.
3. Wait for the system to regulate. This may take
from 10 to 30 minutes. Then, adjust the
temperature, if necessary.
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.
4. Press OFF to turn the climate control system
off. Only the rear defog and heated seats will
function. Press AUTO or any other button
except the heated seats or rear defog to turn
the climate control system back on.
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