Sensor-Ambient Air Temperature: Description
WARNING: This page is about a different car, the 2005 Dodge Durango. However, it is still accessible from the selected car via links, so may be relevant.
The ambient air temperature sensor is a variable resistor that monitors the air temperature outside of the vehicle. The ambient air temperature sensor is mounted onto the inside of the front bumper beam and its data is used by the heating-A/C system to maintain optimum cabin temperature levels.