Quote:
Originally Posted by Amini77
When we went to go check out a 535i to buy at Center BMW I was asking the dealer what that humming noise was, he told me it was a secondary fan that cools down the firewall or whatever around it. I mean it makes sense, but Center BMW are iffy so they could be BSing, and it makes more sense that it occurs more often after your JB4 install since its running harder so it gets hotter. If its something wrong I don't really care since its warrantied until 100,000 miles for me. I can't remember if it was the same exact noise but I definitely remember it being a humming noise.
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This actually makes sense, I tracked the source of the sound and believe it came behind the engine, between the engine and the firewall. However I can't visually see any fan there, probably covered by some plastic. Hope that's all it is.