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From what I gather, it is a device that protects the evaporator in Nissan and some other automotive AC systems from freezing up. The device is a transistor switch component driven by voltage or current derived from an integral thermistor.
Colder/Freezing temperatures cause the circuit to open and through the ECM and Air Conditioner Relay stop the compressor.
The unit used by Nissan works as follows:
As the temperature is decreasing the circuit opens around 38 to 37° F to turn off the compressor. There is a one to two degree hysteresis in the unit to prevent rapid cycling of the compressor. The device closes the circuit when the temperature reaches 39 to 41°F.
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∙ 16y ago
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