Air Temperature Actuator

When the ignition switch is in the RUN position, battery voltage is applied to the air temperature actuator. The actuator receives ground at all times through the following components:
^ CKT 251
^ Ground G204

The temperature selector is a potentiometer with a wiper arm. The wiper arm is electrically tied to the air temperature input through CKT 733.

When the temperature selector is moved between COLD and HOT voltage to the control input varies between 1 and 12 volts. The temperature valve motor solid state circuitry performs the following tasks:
^ Looks at the control input voltage
^ Moves the motor to correspond to the control input voltage

The temperature valve moves for the following reasons:
^ In order to allow the air to pass through the heater core
^ In order to allow the air to pass around the heater core

This control achieves the desired passenger compartment temperature.