Quote:
Originally Posted by Caryalon
It's not a wild guess, but if you know what the solution is, have at it.
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Quote:
Originally Posted by AceEngineer
It appears that the AC compressor is dying in my 2005 E53 4.4i. The symptoms point to something in the clutch causing intermittent operation. I have looked for a replacement clutch but it appears that the clutch is not available separately from the compressor. A BMW brand compressor is $1300 to $1500 but there is a plethora of aftermarket brands available in the $200 to $500 range. Does anybody out there have any experience with aftermarket compressors? I usually buy only BMW brand parts, but in this case the potential savings is high and my X5 has 140K miles on the clock. Looking for advice.....
AceEngineer 
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Quote:
Originally Posted by AceEngineer
It's not the control valve, it's the clutch. I can see that the clutch does not even try to engage even with power to the clutch. There are no shims in the system, it is a magnetic clutch and I can tell that the coil is not powered because it won't attract a screwdriver even with power at the connector. There is an intermittent open in the clutch circuit inside the clutch housing!! Please, I'm looking for someone with experience with aftermarket compressors not wild guesses about what may be wrong, I know what the problem is and the quickest path to working air is to replace the whole compressor..
AceEngineer
P.S. Thanks to Effduration for the pertinent information, I'm going to look into it at my local BMW indy wrench.
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Perhaps if you gave better info about the problem you wouldn't be getting all those Wild Ass Guesses (WAG). In your 1st post, you stated that the problem was intermittent. Your last post stated that it is an electrical issue. Obviously, you don't know anything about AC compressor and their operations.