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Old 08-25-2007, 11:55 PM
saumil saumil is offline
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Join Date: Aug 2001
Location: Houston, Texas
Posts: 393
I dont know how an expansion valve failure would cause a RPM dependant failure. It controls the amount of rerigerant entering the evaporator and if everything as far as temperature is concerned is the same, RPMs should not affect its operation directly and because you are getting good cooling at low RPMs, it should atleast be opening normally to a certain level. RPM will change the operation of the compressor for sure and could result in higher high side pressures causing the compressor to shut down but if you say the compressor does not shut down then again there is a puzzle. Maybe the clutch clearance on the compressor is too much and is not engaging properly, search for clutch clearance and you may find something useful related to your problem.
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Saumil S. Patel
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