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AC DRYER CONNECTIONS?

1999 FREIGHTLINER AC DRYER HAS TWO PRESSURE SWITCHES
ONE FOR PUMP CYCLE WHAT IS THE OTHER CALLED AND
WHAT DOES IT DO
DENNIS DORVEE, September 2007
One is a binary switch to protect the system from operating under too high or too low refrigerant pressures, it is the one without wires.
The other is the fan cycle switch it opens the circuit to the fan solenoid when pressure reaches 300+/- 10 psi

johnnyfreightliner, July 2008