Air Temperature Actuator
WARNING: This page is about a different car, the 2002 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
The air temperature actuator is a 3 wire bi-directional electric motor. ignition "3" voltage, ground and control circuits enable the actuator to operate. The control circuit uses a 0-12-volt linear-ramped signal to command the actuator movement. The 0-12-volt control values represent the opposite limits of the actuator range of motion. The values in between 0-12 volts correspond to the positions between the limits. The control signal sets to a value of 0-12 volts when the HVAC control assembly sets a commanded or (targeted) value. The actuator shaft rotates until the commanded position is reached. Once a new commanded value is needed the HVAC control assembly control value changes.