A/C evaporator thermostat switch

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Marty Davis said:
Can anyone tell me how to verify my air conditioner thermostat or evaporator switch is working? 1969 Barracuda. the part number is 2837223.
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If your AC system is working OK, this switch prevents freezing of the evap coil by opening the circuit to the compressor clutch coil when temp drops to ~40F. Thus the compressor should cycle on and off with the air temp coming out of the evaporator not dropping below about 40F. As you move the temp control lever to a warmer setting, a cable to the switch increases the setting and causes the compressor to cycle on and off at a higher temperature.
If the switch is out of the evaporator, I you could test it in an ice water bath to ensure it is open circuit as the temp drops below 40F.
Hope that helps
Jim
 
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