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Old 04-02-2002, 10:00 PM
400E 400E is offline
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Join Date: Jun 2001
Location: Omaha, NE
Posts: 962
"2) Air conditioning ON scenario:
What I did not know--- AS SOON AS YOU TURN THE AIR CONDITIONING ON - REGARDLESS OF OUTSIDE TEMPERATURE - THE FREON PRESSURE SENSOR WILL DETECT THAT THE COMPRESSOR IS COMPRESSING THE FREON AND THE SENSOR WILL TURN ON THE AUX FAN ON LOW SPEED TO ENSURE THERE IS NO EXTRA HEAT LOAD ON THE ENGINE CAUSED BY THE LOAD OF THE AIR CONDITIONER. "



Is this accurate? It is my understanding that

1) low-speed fan operation is NOT directly coupled to AC operation but rather is intended to come on IF AND ONLY IF refrigerant pressure is higher than a certain threshold;

and

2) the purpose of the low-speed aux fan circuit is really to protect the COMPRESSOR rather than prevent engine overheating.

In any event, my low-speed fans DO NOT come on every time the AC is on but do cycle on and off as refrigerant pressure rises.

Maybe the 560 engine is different in these respects from mine.
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Steve
'93 400E
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