Thats the whole purpose of the pressure switch is to cycle the compressor. The expansion valve merely controls the flow of refrigerant through the evaperator. Keeping the evap fan running all the time will not prevent the evap from freezing up.
I like the cond. fan on a pressure switch simply because sometimes when the weather is right...the cond fan does not need to run to maintain a correct head pressure. Too low head pressure will cause liquid to possibly get back to the compressor and cause premature failure.
Either way is good.
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" If it wont break em loose in 3rd gear, it aint enough power "
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