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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 04-02-2004, 04:56 AM   #1 (permalink)
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Join Date: Jan 2004
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NickC is an unknown quantity at this point
I have a '97 E39 saloon, it's a great car and gives me no real problems but I have had now, for about 2 years, a noise coming from the A/C compressor. I know it's this because if I turn off the A/C it stops.
It sounds like the bearing is sh@gged on the driveshaft of the comperssor yet I've had it checked out and it appears fine. The A/C works no problem and it's no issue other than it doesn't sound particularly impressive when sitting on tickover.
I tried spraying WD40 onto the pulley/shaft assembly and the noise went but then it's back a while later when things hot up under operation. Does anyone have any ideas as to what I could do to stop it other than the obvious replace the unit suggestion? Maybe something more viscous than WD40 that will stick and dampen the noise more?
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