MBA 11' fan idle vs. MBP

Discussion in 'MacBook Air' started by Maccie2, Nov 21, 2010.

  1. Maccie2 macrumors newbie

    Nov 21, 2010

    I'm reading here that most of your MBA 11' have completely inaudible fans, but my fan is audible in a silent room. It's not very noticeable, but you can hear the MBA fan crackle softly when MBA's waking up from sleep. Also at idle (2000rpm) there is a soft hi-pitched whirring/humming sound, that I don't hear on my MBP 15'.
    I'm wondering if I have a badly balanced/faulty fan, or if this is normal?

    Maybe I'm obsessing, but I often use my MBA in a dead silent room so any sound is noticeable.. :)

    Could some 11' MBA users here confirm if the MBA fan are slightly more noisier at idle than MBP fans?

    Thanks! :)
  2. elwood58 macrumors member

    Oct 26, 2010
    My fans idle at 2000, and I cannot hear them at all when idling.
  3. dmelgar macrumors 68000

    Apr 29, 2005
    I can't get a completely silent room. Always some level of distant road noise of otherwise.
    In my case, I could never hear the fan in the 11" MBA. My MBP on the other hand, spins up to hair dryer setting.
  4. soldierblue macrumors 6502

    Mar 23, 2009
    I can hear a little buzzing whir in a silent room. Bow, how often are you going to be in a silent room?
  5. Maccie2 thread starter macrumors newbie

    Nov 21, 2010
    Thanks for the replys. I think my fan is a bit more noisy than usual, but I think I'll wait and see for now.. Thanks again. :)
  6. Kurthis macrumors newbie

    Nov 22, 2010
    Just registered to reply to your thread :)

    I'm having the same "issue" with my now 2 and a half week old MBA 11"

    The same crackling sound when waking from sleep and humming/whirring fan when idling.

    But it wasn't like that till the day before yesterday. So my guess is, that the fans bearing or grease or whatever (cause I thought it uses magnetic force to stay in place) is faulty...

    I don't have much time, so it's difficult for me to head for a store and let them have a look on it. But I definitely will have them take a look on it as soon as I can manage to do so...

    The MBA is right beside my iMac and I can hear the fan from the MBA and the HDD spinning from the iMac...

    I tried to fix it by raising the rpm of the MBAs fan with smc fan control for a couple of minutes, but it didn't help.

    Greetings from Germany :)
  7. Maccie2 thread starter macrumors newbie

    Nov 21, 2010
    I tried to get hold of a screwdriver so I could open up the MBA to see what's going on, but Apple uses unique 5-point torx screws, which are not commercially available. Please tell us how it goes..I don't think I'm gonna bother messing around with it myself..too much hassle.
  8. tirerim macrumors regular

    Aug 4, 2006
    I won't disagree about the hassle, but they're certainly commericially available, for example:

    Not sure what size the Air uses, so it's possible you'd have to search around for something smaller, but googling for 5-point Torx brings up plenty of results.
  9. RobNor macrumors 6502

    May 29, 2010
    On my 13" MBA I can only hear the fan (2000rpm) if I put my ear within a few inches of the keyboard
  10. Kurthis macrumors newbie

    Nov 22, 2010
    A quick heads up to the "mysterious crackling sound" story:

    I went to an apple reseller today, which has no fixing service, and took a look at the other 11.6" MBAs which were standing around on those shiny tables.

    ALL of them make that sound when waking from sleep, so I'm now rather satisfied and I think that this sound is normal.

    The employees bugged me the whole time, why I was holding my ear so close to the 11.6" MBAs xD
  11. Maccie2 thread starter macrumors newbie

    Nov 21, 2010
    Thanks, I kinda felt like a nerd asking about such an inconsequential thing in the first place. :) Good to know. I was wondering if my MBA fan was unbalanced, thus giving off more noise than necessary. Thanks!
  12. duk macrumors regular

    Oct 9, 2008
    I have not heard my fan do any kind of crackle, but it does have a high pitched whir to it that I can hear in a quiet room while at 2000 rpm.
    I have an 11.6 base model.

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