I have a 13-inch MacBook Pro from early 2011, with custom SSD & Memory upgrade.

For the last few months, the fan has been running at max speed or close to it.

To fix it, I've tried:

  • Resetting the PRAM
  • Resetting the SMC
  • Replacing the fan
  • Starting in Safe Boot mode
  • Setting the fan speed manually with an app called tg Pro

These are the temperature readings outputted by tg Pro on my machine.

Temperature readings

The only way I can silent the fans is to override the Mac's native fan control system and turn it down, but then I'd probably be damaging the internal components.

Some things that could help diagnose the problem: - When I started in Safe Boot mode, there were some visual artifacts in the form of horizontal bars going across the screen. I did a screen capture with Quicktime but strangely enough the visual artifacts were not present. These artifacts do not appear when I boot in normal mode.

I suspect it is a hardware problem and I'm three quarters tempted to schedule a rendezvous with the Apple Store but if you have anything else I could try I'm all ears.

  • When did you install the SSD? I have some Compaq servers that max the fans because the hard drives are not reporting the drive temp properly via SMART. Not saying that's the issue but I am wondering if there is a correlation there. – Thomas Nelson Jul 27 at 4:59
  • At 8 years old, I'd be thinking cracked thermal paste; needs a strip & replace. Fans ought to be running at 78°, but they should be capable of dropping that temperature. If they can't, then something else is preventing cooling... hence my thought. [btw, starting in safe mode disables GPU acceleration, hence the artefacts] – Tetsujin Jul 27 at 7:26
  • What does activity monitor show on cpu used? – user151019 Jul 27 at 11:59
  • @ThomasNelson The SSD was installed years ago, but the fan problem appeared much later. – edoreld Jul 27 at 15:12
  • 1
    @Tetsujin hmm thanks for the tip, I'll check that out – edoreld Jul 27 at 15:13

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