iMac Mid 2011 i5, fans on full constantly

Discussion in 'iMac' started by LAHegarty, May 4, 2018.

  1. LAHegarty macrumors regular

    LAHegarty

    Joined:
    Aug 17, 2013
    Location:
    York, UK.
    #1
    -iMac 2011, fans on full constantly-

    Macs Fan Control stopped the problem but only if that is installed, running and I'm logged in.

    Any idea what might be causing this?

    I've tried as follows:
    - PRAM reset
    - SMC reset
    - Tried different RAM
    - Clean install

    Would like to try a firmware update but can find any that will work on this iMac...

    Maybe you know how to fix this.
     
  2. Richdmoore macrumors 68000

    Richdmoore

    Joined:
    Jul 24, 2007
    Location:
    Troutdale, OR
    #2
    Do you have the original hard drive in the system? If not, you either need a software solution, or to install the hardware kit owc sells to stop the fan issues.

    (The original hard drive had specific firmware to communicate temperature to the iMac, if the hard drive is replaced without that Apple specific model hard drive firmware, the temperature data is not sent. This causes the computer fans to go into a failsafe mode of full speed.)
     
  3. LAHegarty thread starter macrumors regular

    LAHegarty

    Joined:
    Aug 17, 2013
    Location:
    York, UK.
    #3
    Richdmoore Thanks.

    Yes, I have 2x SSD's installed, I guess I'll be using Macs Fan Control.
     
  4. nambuccaheadsau macrumors 68000

    nambuccaheadsau

    Joined:
    Oct 19, 2007
    Location:
    Nambucca Heads Australia
    #4
  5. LAHegarty thread starter macrumors regular

    LAHegarty

    Joined:
    Aug 17, 2013
    Location:
    York, UK.
    #5
  6. Darmok N Jalad macrumors 65816

    Darmok N Jalad

    Joined:
    Sep 26, 2017
    Location:
    Tanagra
    #6
    Nothing wrong with MFC as a solution. I have it installed on my 2017 iMac just for monitoring purposes. It's a great tool to check temps across the system.
     
  7. LAHegarty thread starter macrumors regular

    LAHegarty

    Joined:
    Aug 17, 2013
    Location:
    York, UK.
  8. Guy Clark Suspended

    Guy Clark

    Joined:
    Nov 28, 2013
    Location:
    London United Kingdom.
    #8
    I had the same issue with my Mid 2011 21.5" iMac after replacing the stock HDD with a Solid State Hybrid Drive. The solution for me was to install Macs Fan Control and set everything manually to 1200rpm
    https://www.crystalidea.com/macs-fan-control
     

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