Control Assembly: Description and Operation

The climate control assembly has three system controls:
^ The A/C heater function selector switch combines vacuum selector valve with two electrical switch to supply battery positive voltage (B+) to the A/C clutch circuit and the blower motor control circuit.
^ The temperature selection is accomplished with potentiometer connected to the electric blend do actuator that controls positioning of the temperature blend door. Movement of the control knob from COOL (Blue) to WARM (Red) causes a corresponding movement on the air temperature control door and determines the temperature that the system will maintain.
^ The blower motor switch controls blower motor speed by adding or bypassing resistors in the heater blower motor switch resistor.