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I have had a homemade thermostat in my last five vehicles which cycles the A/C on and off based on the setting of a potentiometer, which roughly correlates to temperature. The circuit turns the A/C clutch solenoid on and off based on this temperature setting. I originally tried an old house thermostat, but I found the one I had had too much hysteresis, meaning it would be on too long and then off too long, so it would be alternating between freezing and roasting in the car.
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