Thanks trooperbc! So the temp switch opens the contacts and kills the compressor clutch at high temperature, above 320 F, which actually is screaming hot for R-134A. It must do that so it doesn't overpressurize and blow out the line between the compressor and condensor, as the pressure switch on the dryer is located after refridgerant is pumped through the condensor and pressure could be lower there.

I couldn't reuse the old switch, as the new compressor has a pressed in plug where the switch resides.

Just got back from my trip, and the A/C ran like a champ.