8 Replies Latest reply: Jul 3, 2013 1:07 PM by OGELTHORPE
pghkatrina Level 1 Level 1 (0 points)

For the past several weeks the CPU on my MacBook Pro has been overheating that the fan is running very loudly. I've checked iStat on the Dashboard and have seen the temperature go up to 150 - 190 degrees while the fan is running.

 

Now, I'm running a lot on my MacBook. A few Safari windows, Excel for Mac, and Mail are all that is open.

 

I've taken off my Speck snap case, cleaned and wiped down the computer, restarted it; but it's still overheating at least once a day.

 

Any thoughts? Is there something I'm missing?

 

I'm pretty gentle with my MacBook. I'm the only one who uses it. - I have a 2011 MacBook Pro. Its running OSX 10.8.4 with Intel Core i5.


MacBook Pro, OS X Mountain Lion, Early 2011
  • 1. Re: CPU keeps overheating
    FatMac>MacPro Level 4 Level 4 (2,380 points)

    Since you're already paying attention to the actual internal temperatures (i.e., it isn't simply "my macbook pro gets hot!"), you might try smcFanControl as a way to control the fan speed yourself for greater cooling.

     

    Also, you might find this discussion of MBP cooling of interest.

  • 2. Re: CPU keeps overheating
    OGELTHORPE Level 7 Level 7 (25,675 points)

    First do a SMC reset:

     

    http://support.apple.com/kb/ht3964

     

    If the temperatures do not fall, run an Apple hardware test;

     

    http://support.apple.com/kb/ht1509

     

    You may have to use OPTION D to start it.

     

    Post back indicating what the results are.

     

    Ciao.

  • 3. Re: CPU keeps overheating
    pghkatrina Level 1 Level 1 (0 points)

    I ran both. Had to use my Leopard disc for the Hardware test (Thank you for the tip on Option+D). It was loud when the test ran but it came back OK.

     

    Now according to my iStat the CPU is around 130-140 degrees, with 90% idle 7% user and 3% system.

     

    Is this acceptable or should I proceed further?

  • 4. Re: CPU keeps overheating
    pghkatrina Level 1 Level 1 (0 points)

    From what I'm seeing this is supposed to control the fan speed - correct? What would be the best/correct one?

     

    I know that the temperature was getting too hot, but really wouldn't know much about that...

  • 5. Re: CPU keeps overheating
    OGELTHORPE Level 7 Level 7 (25,675 points)

    When your MBP gets what you believe to be hot post the equivalent images of your MBP of both iStat pro and Activity Monitor.  Make certain that Activity Monitor is set to 'All Processes' and %CPU' displays values from high to low.

     

    Screen Shot 2013-05-11 at 11.03.58 AM.png

    Screen Shot 2013-02-21 at 3.08.47 PM.png

    Ciao.

  • 6. Re: CPU keeps overheating
    pghkatrina Level 1 Level 1 (0 points)

    Ok - Here are mine. I actually had them sorted, so is there something I'm missing? Is there another way to set the fans?

    2013-07-03 02.53.25 pm.png

    2013-07-03 02.53.15 pm.png

  • 7. Re: CPU keeps overheating
    FatMac>MacPro Level 4 Level 4 (2,380 points)

    pghkatrina wrote:

     

    From what I'm seeing this is supposed to control the fan speed - correct? What would be the best/correct one?

     

    I know that the temperature was getting too hot, but really wouldn't know much about that...

    In addition to the "Default" setting, which is whatever Apple thinks is OK for temperature vs fan speed, you can create additional custom fan speeds which you can choose from the pull-down menu instead of Apple's Default. What's important to realize is that all you're setting is the lowest fan speed when the computer is running. If it begins to heat up to the point that, even in Apple's design, more ventilation is needed, the fan will still speed up. And since the smcFanControl menu shows both the fan speed and a temperature, it's easy to monitor.

     

    As to which speed is best, the speed would depend on what you're currently doing and the heat that generates. Moreover, you can try different speeds to see what gives an operating temperature you're comfortable with in given situations and then save them as a variety of your custom settings, choosing them as needed.

  • 8. Re: CPU keeps overheating
    OGELTHORPE Level 7 Level 7 (25,675 points)

    The temperatures shown on the iStat pro display are on the high side but within acceptable levels for the activity being performed.  The operating environment such as room temperature can have an effect on the internal temperatures as well as how the MBP is positioned to allow air to flow freely around it.

     

    I would open the MBP and examine if there is any accumulation of any dust or dirt inside.  If so clean it out.  The fan is a popular place for contaminant build up.  If nothing is found, then for peace of mind you may have an Apple store genius bar technician look at it.  There is no charge for that.

     

    I personally do not favor user fan controllers.  I have faith in the Apple engineers designing an adequate cooling system.  Others have differing thoughts on this.

     

    Ciao.