Ask your local junk yard to source the control amplifier !
AUTOMATIC TEMPERATURE CONTROL SYSTEM
The automatic temperature control panel has a temperature selection knob to select temperatures between 65 F (18 C) and 85 F (29 C). The mode knob (vacuum operated) allows for selection of "OFF", "LOW", "AUTO", "HIGH" and defrost. "HIGH" and "LOW" selects a fixed blower fan speed. "AUTO" allows for a variable blower fan speed. A thumb wheel allows for increase or decrease of temperature of air being delivered through face level vents, without effecting interior temperature setting of automatic setting.
The automatic temperature control uses in-car sensors to compare vehicle interior temperature to temperature set on control panel. This comparison provides an electrical signal (negative or positive) to control amplifier. The control amplifier provides electrical signals to a servo control unit and blower speed relays mounted on heater box which changes heater box air doors and blower speed to maintain interior temperature
Sunday, January 10th, 2010 AT 7:01 AM