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im looking for this sensor. I believe its the compressor shut off switch. The ones at the parts house look like the one on the evaporator. I included a link and hopefully the picture comes through. Im looking for the missing sensor next to the one plugged in on the silver AC line
I had to replace the one you are showing, it ingages the fan when there is pressure in the AC line. O' Rileys auto parts had both in stock in florida, about $16.
That is the high pressure compressor cutoff sensor. It shuts off the compressor if the pressure gets too high. It looks the same as the low pressure sensor and has the same type of connector.