2013 MBA, Catalina: How to stop kernel_task compensating for a non-existent overheating issue

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Level 1

8 points

2013 MBA, Catalina: How to stop kernel_task compensating for a non-existent overheating issue

I think my MBA believes its CPU is overheating. Accordingly, it runs up kernel_task to 70 or so percent of CPU and leaves it there unto all eternity, slowing the computer down to a crawl. It also runs the fan up to 100%. The issue started when it was still on Mojave; it persisted through a clean reinstall; it persisted through an update to Catalina; it persisted through all updates; it persisted through all Apple Support's troubleshooting steps, and I don't have a nearby AASP.

It isn't overheating. I am one hundred percent sure of that.

I can ramp down the fans with MacsFanControl, but I can't find anything to do for the kernel_task soaking. Is there any way—a system setting, an app, something in homebrew, a hack, literally anything I can do—to tell Catalina "hey, you know how you think the CPU's overheating and you need to do something about it? Don't worry about it. Just chill, let it ride, man."?

MacBook Air

Posted on Jan 30, 2020 1:25 PM

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Answer 1

John Galt

Level 10

157,022 points

Jan 30, 2020 6:07 PM in response to SHIELD616

If kernel_task is using a large percentage of your Mac CPU explains what to do, but you have to traverse the links to find Apple's recommended action: Reset the System Management Controller (SMC)

Do not resort to installing clever hacks that seek to circumvent the Mac's exquisitely engineered cooling system. To to so merely addresses a symptom while the cause goes unchecked, and is certain to result in accelerated hardware failure. Fix the problem.

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Answer 2

John Galt

Level 10

157,022 points

Jan 30, 2020 6:15 PM in response to SHIELD616

Contact Apple Support again, reference the case number they provided to you, tell them it's still not fixed, and ask them how to proceed. It's likely a thermal sensor has failed or become disconnected.

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