BTW, the switch cycles the compressor on and off based on the temperature of the evaporator. It tries to keep the evap temp from dropping below freezing temp during low load. 77 & 78 used thermal cycling switches to cycle the compressor, 79 (?), 80, 81 used a cycling pressure switch on the accumulator to accomplish the same thing. Most cars built today use the cycling pressure switch, since it has proven to be cheap and reliable.
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"...ridge reamer and ring compressor? Do they have tools like that?"
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