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Originally Posted by Brian Carlton
This can get confusing, because the 603 is what you were originally thinking. It can turn the fan on 1/2 speed from the pressure switch on the dryer and it also has a 105°F. coolant switch that turns the fan at full speed when tripped.
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No. The aux fan is actuated by the
temp switch on the receiver/dryer. The
pressure switch allows the a/c compressor to run. Or more specifically, it prevents the compressor clutch from engaging if there is inadequate refrigerant pressure in the system.