I have the latest iteration of the 2017 13" MBA, running macOS 10.12.latest, and I have an annoying problem with the fan.
Every time the fan starts up it will stay running, forever, and never throttle down to lower RPM, not even after sitting idle for half an hour with no CPU/GPU load whatsoever. The only thing that works is to restart the MacBook or put it to sleep and wake it up again. It doesn't matter what triggers the fan (CPU or GPU intensive), though for some reason almost every time the problem shows up is when I'm browsing something with Safari, even if it's "harmless" content with no obvious buttload of hungry javascript.
I've tried resetting the SMC, and every time this happens I also take a quick look for suspicious CPU load in the activity monitor (or using top) but there's never anything hungry going on that should warrant the fan to keep going indefinitely. There's no obvious thermal problem either - the laptop always runs completely cool to the touch and the fan rarely spins up (but when it does...)
Every time the fan starts up it will stay running, forever, and never throttle down to lower RPM, not even after sitting idle for half an hour with no CPU/GPU load whatsoever. The only thing that works is to restart the MacBook or put it to sleep and wake it up again. It doesn't matter what triggers the fan (CPU or GPU intensive), though for some reason almost every time the problem shows up is when I'm browsing something with Safari, even if it's "harmless" content with no obvious buttload of hungry javascript.
I've tried resetting the SMC, and every time this happens I also take a quick look for suspicious CPU load in the activity monitor (or using top) but there's never anything hungry going on that should warrant the fan to keep going indefinitely. There's no obvious thermal problem either - the laptop always runs completely cool to the touch and the fan rarely spins up (but when it does...)
