Temperature Blend Door Actuator

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

The temperature blend door actuator moves the temperature blend door on command from the EMTC module.

The temperature blend door actuator contains a reversible electric motor and a potentiometer. 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 contact wiper, which is driven along the variable resistor by the actuator shaft. The signal returned to the EMTC module from the contact wiper indicates the position of the temperature blend door. The EMTC module drives the actuator motor in whichever direction is necessary to make the actuator contact wiper voltage agree with the expected EMTC module contact wiper voltage value.