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- Jan 15, 2018
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The fan on my MacBook Air (Early 2015, Mojave), which typically doesn't turn on at all (or to an even slightly audible level) even during high CPU load, inexplicably turns on and stays on every few days. Checking activity monitor, the CPU is 95-99% IDLE and no processes are using more than 1-2% CPU, using iStats to check CPU temperature it's between 35-45 C which is low. Again, the fan doesn't usually turn on to audible levels even during moderate to high load, so I can't think of a reason it would come on with NO load. Interestingly, simply closing the lid and letting it sleep and opening it a few seconds later and the fan quiets down again! What's going on?
I've tried SMC and NVRAM reset, as well as a complete re-install of MacOS. This started happening only with Mojave, and never happened with High Sierra, Sierra, or El Capitan.
I've tried SMC and NVRAM reset, as well as a complete re-install of MacOS. This started happening only with Mojave, and never happened with High Sierra, Sierra, or El Capitan.