Sensors - Chevrolet 2010 Avalanche Owner's Manual

The solar sensor, located in the defrost grille, middle of
the instrument panel, monitors the solar heat. Do not
cover the solar sensor or the system will not work
properly.
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There is also an exterior temperature sensor located
behind the front grille. This sensor reads 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 your comfort setting by
adjusting the outlet 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.
There is also an interior
temperature sensor
located next to the
steering wheel that
measures the temperature
of the air inside your
vehicle.