Temperature Control Knob

The rotary temperature control knob is a potentiometer which sends a voltage signal to the A/C temperature valve actuator. The voltage signal varies according to the temperature knob position.

When the temperature control knob moves fully to the left (COOL), less than 1 volt is supplied to the A/C temperature valve actuator.

When the knob moves fully to the right (WARM), the battery voltage is supplied to the A/C temperature valve actuator.