08 4.8i underhood noise
 

Noticed during acceleration as the RPM's increase I hear a buzzing coming from under the hood. It only occurs around 2500 RPM and sounds like something is loose and vibrating. I replaced and reconnected the partitions and the buzz is still there. Any ideas as to potential cause and remedy?

Record it and post, it could be a lot of things

Ditto on the noise but I noticed mine didn't change tone either rpm variances or wind speed. So I'm guessing it's the elect. cooling fan


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