My 2018 Macbook Pro 15 inch fan is running at full speed all the time. I checked activity monitor and my idle was >95%. If this is a hardware problem, is there any way to fix it without opening up the whole computer? Otherwise, are there any easy fixes? Thanks

  • 1
    Since this is a power/fan/temp related issue, the first thing to do is reset the SMC Next, run in Safe Mode (Hold Shift while booting`) post your results.
    – Allan
    Commented Jul 12, 2020 at 5:40
  • Welcome to Ask Different. If no apps are shown, it is probably a background process. Activity Monitor can help you identity which background processes are having high CPU usage, see support.apple.com/HT201464 for more details.
    – jaume
    Commented Jul 12, 2020 at 11:18
  • have you seen a similar issue caused by excess activity from WindowServer? I was trying to study the temperature and cant get the specific values using "sysctl -a | grep cpu"
    – Asher
    Commented Jul 18, 2020 at 21:14

1 Answer 1


Like Allan said in the comments, try resetting the SMC, or if you want to manually bring down your fan speed manually, try using Macs Fan Control (this app can and will come in handy later in your life).

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