Without Automatic A/C

Heater And A/C Control:

The operation of the A/C system is controlled by buttons and knobs on the control head. The compressor clutch and blower are connected electrically to the control head by a wiring harness. Air flow is provided by the four blower speeds available. Cooled and dehumidified air is available in all modes. A/C compressor operation is forced in max and defrost modes and is available in remaining modes by pushing A/C button to light indicator above button. Low ambient temperatures below 8°C (43°F) will not permit operation of A/C compressor.

The temperature knob controls the temperature valve through a potentiometer in the controls and electric motor attached to the heater module. The modes of operation are controlled by knobs that send an appropriate electrical signal to the five solenoid valves that control the flow of vacuum on the various vacuum valve positioning actuators. The knob on the left controls blower motor speed. Turning the knob to the right increases motor speed. The blower is turned off in the "OFF" mode of Operation.

Temperature valve position is independent of mode selection.