Airflow Mode Door Position

The defrost/panel/floor airflow mode door actuator uses a cam, lever and cable assembly to position the airflow mode doors on command from the HVAC module. The defrost/panel/floor airflow mode door actuator contains a reversible electric motor and potentiometer. The potentiometer allows the HVAC module to monitor the position of the airflow 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 circuit is connected to a contact wiper, which is driven along the variable resistor by the actuator shaft. The signal to the HVAC module from the contact wiper indicates the position of the airflow mode doors. The HVAC module powers the actuator motor to move the airflow mode doors to the desired position. The desired position is set by the vehicle occupants using the mode selector buttons.

The defrost/panel/floor airflow mode door actuator is located on the heater core and evaporator core housing to the right of the steering column, and is part of an assembly with the defrost/panel/floor mode door actuator actuating assembly.