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Old 06-20-2012, 04:38 PM   #16
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Join Date: Dec 2010
Location: MD, USA
Posts: 1,489
My Ride: 01 330CI 6MT ZSP EU3
Well, if pressure sensor is bad then compressor does not engage at all. That was an issue with my A/C system and I proved it via INPA (see screenshots above). My second problem was high and low pressures did not equalize quickly enough when compressor is off. That is why I decided to take whole system apart and replace expansion valve, condenser, dryer and flush all the hoses (so, I'll check the hoses during flushing).
If compressor kicks then most likely the pressure sensor is fine. You need to hook A/C gauges to check high and low pressures during the compressor cycles. It might be just low refrigerant issue, or it might be a clog somewhere.
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