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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 07-19-2005, 10:23 AM
david540i david540i is offline
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Location: tx
Join Date: May 2005
Posts: 8
Mein Auto: 97 bmw 540i
97 540i A/C Noise

i get this werid noise like a fan is hitting against something when I first turn on my A/C. But it doesn't look to be a raditor or a/c fan. This happens for just a few seconds after turning it on. Also happens at times depending on egine rev. The higher I rev the louder or faster the "fan hitting noise" is.

The A/C blows cold at times too. If the car is in motion with the engine revs up, theres no problem. But if im at a red light, after a few seconds....warmer air is coming through the vents.



PS: after examing the noise it seems to come from the lower left front of the E39 540i engine.
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Old 07-19-2005, 01:44 PM
crazy4dss crazy4dss is offline
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Location: florida
Join Date: Jul 2005
Posts: 25
Mein Auto: 1997 BMW 540I
It sounds like your having a compressor issue. Only the compressor would rev up or down as the engine does. Check to make sure when the clutch on the comp. engages its not hitting anthing tha might be loose around it. If you can see anything externally then your problem is internal but it would the compressor
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