How does that work exactly? is there a minimum pressure setup that then turns the clutch on and then a high pressure setting that turns it off? And what determines WHEN the settings are reached?

Thanks for your help.

 

The Laws of Thermodynamics

Steve

 

Thanks for the non-answer.

 

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You are correct about the cycle being pressure sensitive, but have the pressures reversed. The AC compressor clutch circuit runs through a pressure switch that resides on the low pressure side, usually mounted on the moisture accumulator (metal can just in front of the firewall). As the compressor runs, the pressure gets lower on the intake (low pressure) side. When the pressures gets low enough, it shuts the compressor off; then, when the pressure rises to a pre-determined level during the off cycle, the compressor is turned on again. I don't remember the exact figures - they are slightly different for each type of system (R-12, verses R-134).