Temperature Selector Lever

WARNING: This page is about a different car, the 1995 Ford RV Cutaway, 1995 Ford Econoline, 1995 Ford Cutaway, and 1995 Ford Club Wagon. However, it is still accessible from the selected car via links, so may be relevant.

Temperature selector lever is part of a temperature control module attached to control frame. The module contains a printed circuit board and a linear potentiometer. The lever is mechanically coupled to potentiometer wiper.

The temperature blend door actuator contains a reversible electric motor and a potentiometer. The potentiometer wiper is connected to the actuator output shaft and moves with the output shaft to indicate position of the temperature blend door.

Battery voltage is applied to the ends of each potentiometer. The voltage available at each wiper indicates position of the potentiometer. Actuator wiper voltage is sent to the control module and matched with wiper voltage of module potentiometer. The printed circuit board then drives actuator motor in whichever direction is necessary to make actuator wiper voltage agree with control module wiper voltage.