GMC Acadia 2011 Owner's Manual page 259

Sensors
The solar sensor, located in the
defrost grille in the middle of the
instrument panel, monitors the solar
heat. Do not cover the solar sensor
or the system will not work properly.
The interior temperature sensor
located on the instrument panel
to the right of the steering column,
measures the temperature of the
air inside the vehicle.
There is also an exterior
temperature sensor located behind
the front grille. This sensor reads
Climate Controls
the outside air temperature and
helps maintain the temperature
inside the vehicle. Any cover on
the front of the vehicle could cause
a false reading in the displayed
temperature.
The climate control system uses
the information from these sensors
to maintain comfort settings by
adjusting the temperature, fan
speed, and the air delivery mode.
The system may also supply cooler
air to the side of the vehicle facing
the sun. The recirculation mode will
also be used as needed to maintain
cool outlet temperatures.
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