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The AC switch and the relay. There is usually a temperature sensor in the passenger compartment ac unit as well.

These cars have something called the Constant Control Relay Module (CCRM), a box mounted under where the battery sits. Inside the CCRM is a relay controlling (I believe) the ground side of the AC compressor circuit. I have had this module fry on 3 different Escorts, with these same symptoms. I'll bet that's the problem here.

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Q: 99 Escort AC will not come on Applied voltage directly to clutch an it works great Low pressure sensor tests good What else could be wrong in the circuit?
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