Temperature Door Actuator
WARNING: This page is about a different car, the 2015 Ford Fiesta. However, it is still accessible from the selected car via links, so may be relevant.
The temperature door actuator contains a reversible electric motor and potentiometer. The potentiometer allows the HVAC control module to monitor the position of the temperature door. The HVAC control module drives the temperature door actuator motor in the direction necessary to move the temperature door to the position set by the temperature selection knob.