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|3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.|
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Originally Posted by drz
It sounds to me like it is the heater valve. I sits right in front of the driver's seat. I describe it as a cyclical clicking. I was once able to stop and follow the noise. I followed it to the heater valve, where I could feel the vibration coming synchronously with the noise. I purchased a replacement, but have not yet put it in. I have had this situation going since the late summer. I will be putting in the new valve in the next couple of weeks.
I hope this helps.
Originally Posted by frank3
Where is the noise coming from? Could it be the noise of some vacuum mechanism kicking in, like the heater directional doors behind the dash that shift the heat from feet to defrost? If this is it and it's recurring, then you have some sort of minor vacuum leak that causes the door to keep closing at low idle (but disappears at higher vacuum levels).
This is a total guess...knowing where the noise comes from will help pinpoint.
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