Does anyone elses fan make a "humming" noise at high rpm and when moved?

Discussion in 'MacBook Pro' started by shanimal, Feb 14, 2012.

  1. shanimal macrumors member

    Mar 12, 2011
    i just noticed this, but when i was playing a game (the rpm of the fans were at max) i tilted my MBP and the was a humming noise whenever i moved it. like when you touch a moving fan and its makes the noise. i dont know how else to explain it (if you have a fan, turn it on and touch it : ) is there a way to tighten the fan down or something? seems to me that the fan might be a tad bit loose and its moving slightly.
  2. thundersteele macrumors 68030

    Oct 19, 2011
    I think that's called angular momentum conservation. When you tilt the running MBP, you change the angular momentum of the fans (because you change the axis of rotation). It seems that, when the fans are running very fast, this puts a lot of stress on the fan fixture - I'm not exactly sure what the source of the noise is, but it might be either the fans touching their enclosure, or just a change in frequency from the applied force.

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