Auxiliary Temperature Blend Door Actuator

WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.

The auxiliary temperature blend door actuator moves the auxiliary temperature blend door on command from the HVAC control module based on input from either the front or rear auxiliary climate controls.

The auxiliary temperature blend door actuator contains a reversible electric motor and potentiometer. The potentiometer allows the HVAC control module to monitor the position of the auxiliary temperature blend door. The potentiometer circuit consists of a 5-volt reference signal connected to one end of a variable resistor, and a signal ground connected to the other. A signal circuit is connected to a contact wiper, which is driven along the variable resistor by the actuator shaft. The signal to the HVAC control module from the contact wiper indicates the position of the airflow temperature blend door.