Mode Door Actuators

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

Electric mode door actuators are used to position the air flow mode doors and air inlet mode door. The 2 mode door actuators each contain a reversible electric motor to position the airflow mode door. A potentiometer is installed in the defrost/panel/floor door actuator to allow the EATC module to monitor the position of the air flow mode doors. 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 return circuit is connected to a wiper which is driven along the variable resistor by the actuator shaft. The signal returned to the EATC module from the wiper indicates the position of the air flow mode door. The air inlet mode door actuator is driven to the full RECIRC or full FRESH air inlet position, and does not require a potentiometer circuit to monitor its position.