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  1. #1
    imac temperature fan control problem

    Member Since
    Jun 13, 2011
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    imac temperature fan control problem
    hi i have an imac i bought from a friend that i use for sound engineering with pro tools and reason. its in perfect condition except for a problem it has had since before i owned it which is that it is always overheating. i have smc fan control and it always says between 70 and 80 degrees when i turn it on and progressively gets up to about 90 before it freezes and i have to hit the power button. no part of the imac feels hot at all when this happens and it happens even if its been off for a day in a cold room. the friend i bought it from had it reformatted for me and it didn't have this problem for no more than a few days after i started using it. it also, after the temp problem became regular, wont even boot up all the way most of the time without freezing and when it freezes the loading cursor is present and i can move it. usually after i try to boot it up a couple times it will finally start fully and already be at 90 degrees but with the fans on full blast it will go down to about 80 and level out if im not doing much on it. my imac is a very important piece of equipment and its getting worse so i really need to get this fixed. there must be someone out there who has experienced this problem.

  2. #2
    imac temperature fan control problem
    cwa107's Avatar
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    Dec 20, 2006
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    Are those temperature measurements in Celsius or Fahrenheit?
    Liquid and computers don't mix. It might seem simple, but we see an incredible amount of people post here about spills. Keep drinks and other liquids away from your expensive electronics!

    https://youtu.be/KHZ8ek-6ccc

  3. #3
    imac temperature fan control problem
    chscag's Avatar
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    Jan 23, 2008
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    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, Yosemite
    In addition to what cwa107 asked, it would help if you told us the year and model of your iMac and which version of OS X it's running.

  4. #4
    imac temperature fan control problem

    Member Since
    Jun 13, 2011
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    Fahrenheit. Mac OS X 10.5.8. Not sure about the year.

  5. #5
    imac temperature fan control problem
    pigoo3's Avatar
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    2011 13" MBP 2.3ghz, 8gig ram, OS 10.7.5
    Quote Originally Posted by tenderpile View Post
    Fahrenheit. Mac OS X 10.5.8. Not sure about the year.
    If your iMac temps are in Fahrenheit...those temps (70, 80, 90F) are absolutely nothing to worry about. Think about it...if the room you are in is 80F...then the computer will at least be 80F (and of course higher if the room temp. is higher). Your iMac should probably have temps of 140F or higher. Some folks with Macintosh laptops regularly report temps of 170, 180, and 190F.

    If your iMac is having "freezing" issues...it's most likely not temperature related.

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  6. #6
    imac temperature fan control problem
    BrianLachoreVPI's Avatar
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    Feb 24, 2011
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    March 2011 15" MBP 2.3GHz i7 Quad Core 8GB Ram | Mid 2011 27" iMac 3.4 GHz i7 16 GB RAM 2 TB HDD
    For some reason I'm doubting they're in F.

  7. #7
    imac temperature fan control problem
    harryb2448's Avatar
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    Nov 28, 2007
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    Nambucca Heads Australia
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    iMac i5 2.7GHz, 16GB memory, OS 10.10.5
    Agree with you Brian. Do a Google about cracking the iMac and cleaning out the dust.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  8. #8
    imac temperature fan control problem
    baggss's Avatar
    Member Since
    Oct 10, 2004
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    27" 3.4 Ghz i7 iMac-13" C2D Macbook-OSX 10.10.2 -64Gb iPad 2-64 Gb iPhone 6+-ATV 2-14Tb of Storage
    Your average iMac idles at about 100-120F, so 70-90F is nothing to worry about. If it's shutting don at 90 it's something else, but not heat.


  9. #9
    imac temperature fan control problem
    pigoo3's Avatar
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    Quote Originally Posted by BrianLachoreVPI View Post
    For some reason I'm doubting they're in F.
    I was kind of thinking the same thing...70, 80, or 90C would definitely be a different situation.

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  10. #10
    imac temperature fan control problem
    pigoo3's Avatar
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    Quote Originally Posted by baggss View Post
    Your average iMac idles at about 100-120F, so 70-90F is nothing to worry about. If it's shutting don at 90 it's something else, but not heat.
    Hey baggss (or anyone else with Intel iMac's)...what sort of temps do you get if you're watching internet videos like You-Tube?

    Just curious how iMacs compare with MacBooks/MacBook Pros.

    Thanks,

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  11. #11
    imac temperature fan control problem
    BrianLachoreVPI's Avatar
    Member Since
    Feb 24, 2011
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    Specs:
    March 2011 15" MBP 2.3GHz i7 Quad Core 8GB Ram | Mid 2011 27" iMac 3.4 GHz i7 16 GB RAM 2 TB HDD
    SMC fan control doesn't even work with the new iMac. Mine sits there and registers 32 F the entire time...

  12. #12
    imac temperature fan control problem
    harryb2448's Avatar
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    Nov 28, 2007
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    Nambucca Heads Australia
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    Go into the smcFanControl preferences and double check it is F and not C which on my copy is the default setting.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  13. #13
    imac temperature fan control problem

    Member Since
    Apr 20, 2010
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    21.5 iMac 3.06 ghz 12gb ram 500g HD iPad 2 16G
    Quote Originally Posted by pigoo3 View Post
    Hey baggss (or anyone else with Intel iMac's)...what sort of temps do you get if you're watching internet videos like You-Tube?

    Just curious how iMacs compare with MacBooks/MacBook Pros.

    Thanks,

    - Nick
    If I'm watching a couple Youtube/Vimeo vids...15 minutes or so...I'm around 91 - 95F....I don't watch a lot of lengthy video...I do edit HD video and only hit 120F or so on a 3:50 minute video render...FWIW...

  14. #14
    imac temperature fan control problem
    baggss's Avatar
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    27" 3.4 Ghz i7 iMac-13" C2D Macbook-OSX 10.10.2 -64Gb iPad 2-64 Gb iPhone 6+-ATV 2-14Tb of Storage
    YouTube videos don't seem to really phase the machine at all. Maybe 125F or so.

    The only time my iMac really heats up is if I'm using Handbrake for it's intended purpose, more so if I use the internal DVD drive than one of my external drives. With that I can get the CPUs up to 180F-ish. I use SMC set to Medium and try to keep it below 145F when using HB though.


  15. #15
    imac temperature fan control problem
    pigoo3's Avatar
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    Quote Originally Posted by baggss View Post
    YouTube videos don't seem to really phase the machine at all. Maybe 125F or so.

    The only time my iMac really heats up is if I'm using Handbrake for it's intended purpose, more so if I use the internal DVD drive than one of my external drives. With that I can get the CPUs up to 180F-ish. I use SMC set to Medium and try to keep it below 145F when using HB though.
    Thanks for that. Sounds like what you and "codda" above are saying is that You-Tube videos don't tax the cpu & gpu in iMacs like it does with MacBooks & MacBook Pros...or iMacs have a better cooling system.

    I guess I was trying to figure out if the OP is correctly indicating that their temps are in F or C. As a number of us have mentioned...70, 80, or 90F is nothing at all to be concerned about...but 70, 80, or 90C...could be a different situation for an iMac...especially if watching You-Tube videos on an iMac (usually a somewhat strenuous activity)...results in temps only in the 120'sF.

    Thanks again,

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

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