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Why is my New MacBook Pro fan loud?

1074 Views 7 Replies Latest reply: Feb 23, 2013 1:35 PM by pajamasuit RSS
Boomer2 Calculating status...
Currently Being Moderated
Feb 4, 2013 8:57 PM

Last week I received my new MacBook Pro with retina display 15". The fan is loud--sporadically. Genius Bar did diagnostics on the fan and say it is fine. They suggested I reinstall mountain lion OS. What would that do for the fan? 

  • clintonfrombirmingham Level 7 Level 7 (26,655 points)
    Currently Being Moderated
    Feb 4, 2013 10:22 PM (in response to Boomer2)

    Not much. The fan is going to spin to cool down the machine, if you're engaged in CPU/GPU strenuous tasks. When the fans get high, open Activity Monitor (Applications>Utilities folder) and use the CPU tab and then sort by CPU %. If something's taking up more than, say, 18-20% of your CPU, then you can try to quit the application or process that may be causing the unit to heat up and the fans to increase in speed.


    If everything looks OK from a CPU standpoint, try resetting the SMC (if the folks at the Apple Store didn't already try this).


    Good luck,



  • Courcoul Level 6 Level 6 (11,140 points)
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    Feb 5, 2013 12:52 AM (in response to Boomer2)

    Install iStat Menus and use that to monitor what the fan is doing. Default idle speed is 2000 RPM. Will ramp up to 6000 RPM if things get too hot in there (which you can monitor too).


  • Courcoul Level 6 Level 6 (11,140 points)
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    Feb 5, 2013 7:07 AM (in response to Boomer2)

    Activity Monitor will only give a partial picture of what's going on inside, since the CPU isn't the only hottie in there; the GPU can also pack a wallop.  If you don't want to pay for the new iStat Menu (used to be free), try Marcel Bresink's free Temperature Monitor:  You'll be amazed at the sheer number of temperature sensors inside these things.


    And as to WHY it is running hot, try this:

  • pajamasuit Calculating status...
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    Feb 23, 2013 1:06 PM (in response to Boomer2)

    Did you get this sorted out with the genius bar?  I'm having the same problem with my new 15'' macbook pro that i bought today... :/

  • pajamasuit Level 1 Level 1 (0 points)
    Currently Being Moderated
    Feb 23, 2013 1:35 PM (in response to Boomer2)

    Ah okay, thanks a lot for your response!  That makes me feel better.  Just wanted to know if it was normal! 


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