E46 325i strange whistle noise

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5 years later car is still running fine. Cause never found - still happens when cold outside

lubomirangelov
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Hello I am having the same problem with my e46... Did you find out what the problem was?

THEiLLESTx
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Plus one, five years later, lol. Anyone find the cause? I suspect a crack in the PVC system but not sure it's worth tearing into....

jonphillips
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Same problem but mine goes away after the engine warms up.

rufiorufioo