Driver Side Temperature Door Actuator
WARNING: This page is about a different car, the 2018 Ford Focus. However, it is still accessible from the selected car via links, so may be relevant.
The driver side temperature door actuator is a stepper motor style actuator. The HVAC control module monitors the position of the driver side temperature door by counting the motor steps as it rotates. 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 vehicle occupant.