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Re: Repost: a/c compressor noise (archive)

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Posted by moots on August 28, 2001 at 04:31:06:

In Reply to: Repost: a/c compressor noise posted by Rodney Lyn on August 27, 2001 at 21:21:42:

Whining means the compressor bearings are shot.As for the loud hum,well,maybe it is at the end of it's useful life.And yes the a/c system do need lubricant.Whenever the system is serviced,and vacuumed,they do put is a certain amount of oil to lubricate the compressor.
Have an a/c tech look at it.

moots '90 520i


The compressor on my 94 530i has been noisy since I got the car 2 months ago. It was whining ... had the belt and tensioner checked and both were fine. This past weekend I got caught in some thick traffic and after idling in traffic for say 3-5 minutes the compressor starting making a very loud and deep hum. As soon as I turned off the a/c the noise vanished ... so I know its the compressor. The a/c is ice cold at all times. I realize the two problems could be two different issues but does anyone have any ideas about what the problems is? Do these compressors take oil/lubricant?





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