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The March 2015 update of Apple's 11" MacBook Air features fifth generation Intel Core i5 and i7 processors, resulting in slightly increased performance and battery life.

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2015 MacBook air fan runs, high cpu usage at idle, not overheating.

Ive already

Reset SMC

Reset NVRAM and PRAM

Ran Hardware/ mac diagnostic tool on boot up.

The computer is running slow right at boot up. I have not recently installed anything or changed anything. Issue started after it ran out of battery last night. Activity monitor shows that it takes 22 to 70% of cpu when open. Running at ~80% idle cpu usage. GPU usage is minimal. Issue persists in safe mode, which I had a spike of 93% cpu usage with nothing running. Even with high CPU load, the mac is not heating up like it normally does.

The mac community pages have been very unhelpful. I factory reset it no more than 2 months ago, and would like to avoid doing that again if at all possible.

Answer this question I have this problem too

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maybe try to change the thermal paste ? maybe it’s overheated on the inside and the fan tries hard to compensate the heat that can’t be dissipated.

Hope I helped. ;)


Pretty sure after some troubleshooting, that the issue is a bad heat sensor. Im waiting on a P5 driver before I can actually get in and check it out. Will update then.


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try adding new thermal paste the fans could also be clogged or one could be damaged try cleaning the fans

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