CPU fans spinning a lot after OWC SSD upgrade

Discussion in 'MacBook Air' started by sarimo, Mar 27, 2017.

  1. sarimo macrumors newbie

    Mar 27, 2017
    Hi, I recently purchased and installed a 240GB OWC Mercury Aura 6G 2012 for MacBook Air 5,2.

    After installing the drive, I restored from Time Machine.

    But my CPU fans have been spinning like crazy. Is this normal? I reset the SMC and NVRAM to no avail. Is the SSD defective, and should I send it back?

    Thank you for your help.
  2. ApfelKuchen macrumors 68030

    Aug 28, 2012
    Between the coasts
    Not necessarily the SSD. Could be a temperature sensor. Could be other things. Could be a coincidence and you have a runaway CPU process.

    So, run Apple Hardware Test https://support.apple.com/HT201257
    Open Activity Monitor and see if there's anything pulling high CPU % (over 100% is a dead giveaway).

    Knowledge is better than guesswork.
  3. sarimo thread starter macrumors newbie

    Mar 27, 2017
    Hi, thank you for your reply.

    So in order, I did the following:
    - Reset SMC and NVRAM
    - Did a clean install of Sierra and installed each app one-by-one
    - Activity monitor was clear (attached)
    - Ran Apple Hardware test and it said: no problem found
    - I installed Macs Fan Control, and the fans are spinning at max (attached).

    Attached Files:

  4. vincebio macrumors 6502a


    Jun 27, 2005
  5. T'hain Esh Kelch macrumors 601

    T'hain Esh Kelch

    Aug 5, 2001
    No, mdworker has spent almost no time active, as visible in his first screenshot.

    Your CPU is really hot, that's why the fans are active. And the CPU wouldn't be hot unless you A. have had the CPU active for quite some time, which is inconsistent with your first screenshot, or B. you accidently broke a CPU sensor or unplugged its cable.
    Does the CPU temperature remain high over a periode, with no CPU activity?
  6. sarimo thread starter macrumors newbie

    Mar 27, 2017
    Thanks for your replies.

    Over an hour or so period of monitoring with Hardware Monitor, the CPU proximity temperatures fall between 40-60 degrees celsius, with some spikes. I guess they are generally not too high?


    (and this with minimal CPU activity, a couple of Chrome tabs, a PDF, a file download etc.)
  7. abrahamw88 macrumors member


    Aug 2, 2012
    Rochester, NY
    So looks like it would be option B, possibly a broken sensor or wire connection. Those temperatures do not seem to be high enough to call for maximum fan speed.
  8. Johnny365 macrumors 6502a


    Nov 30, 2015
    The real test to determine that it is the SSD or something else in the system, is to reinstall the factory Apple SSD and check the temperature/fan noise.
  9. flowrider macrumors 603


    Nov 23, 2012

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