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Thread: macbook pro 13" - fan(s) run high, computer seems slow

  1. #1

    Member Since
    Jul 26, 2011
    macbook pro 13" - fan(s) run high, computer seems slow
    I just got a used (only 2 months old) macbook pro 13", and have noticed that the fan(s) seem to be always running on high.

    Intel core i5
    2.3 GHz
    4GB RAM

    When checked with Fan Control, one fan shows 6200 RPM and the other shows -1 !?! The temp shows 35 C, so it's definitely not too hot.

    Activity Monitor shows under System Processes that 'kernel_task' is using ~326% of CPU, and the CPU usage graph at the bottom shows just a big red band with only a little black at the top. User:~ 0.5%, System: ~80%, Idle: ~20%.

    Do I have a broken fan, and the other is just over compensating?

    This is the case whether I'm running any programs or not. Just after startup, the fan comes on (I'm assuming it's just one fan because both Fan Control and iStat Pro show only one fan spinning).

    Any thoughts?

  2. #2

    osxx's Avatar
    Member Since
    Jan 19, 2008
    houston texas
    MBP 13's have one fan MBP 15/17's have two.
    Does it run high fan with all apps closed.

  3. #3

    MYmacROX's Avatar
    Member Since
    Mar 17, 2009
    Those fan control apps may be causing your fan to run unnecessarily high. The fans in a Mac do not need to be adjusted. They are optimized to control temperature inside your Mac and making them run higher than their default settings is not wise.

    If you find that all apps are closed (quit them with Command+Q) and fans are still running high, try Reset SMC.

    I repeat, whatever you do, once you get the fan issue resolved, do not change the default fan settings.
    64GB iPhone 6, 64GB iPad Air 2.

    Reminder: Please include your Mac's specs. This will make it much easier for the other members to assist you.

  4. #4

    Member Since
    Jul 26, 2011
    is there a way to lower the fan speed? some app I can install? Right now it's running at 6200 RPM all the time

  5. #5

    Member Since
    Jul 26, 2011
    The fan was running high before the app was installed. I've tried the SMC reset several times, and installed all software updates.

    iStat Pro desktop widget tells me the same things anyway, so I'll uninstall Fan Control. I didn't use it to change anything, just to view what's going on.

    Any ideas about the 'kernel_task' that looks like it's at over 300% CPU usage?

  6. #6

  7. #7

    Member Since
    Jul 26, 2011
    That looks like a lot of work, but thanks anyway!

  8. #8

    Member Since
    Jul 14, 2011
    did you upgrade to lion? because when i did mine (same version as yours) started to run hot fan on high and felt sluggish

  9. #9

    Member Since
    Jul 26, 2011
    Nope. Still OSX 10.6 or something Leopard?

    I'm going to and Apple store next week. Hopefully they can sort it out. I've read that reinstalling the OS can fix it.

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