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I have a 2019 13" MacBook Pro. Ever since I upgraded to Catalina, the processor fan started randomly going off. Usually it only does that when the laptop is doing something processor-intensive. But now it randomly does it on and off, for no apparent reason. And this only happens under Catalina. This does not happen with Windows 10 under Bootcamp. Anyone else having this problem? It drains the battery like crazy.
MacBook Pro 13”, macOS 10.15
Hello Tim Swope,
Thank you for using Apple Support Communities! I understand that you're experiencing an unexpected battery drain and use of the fan on your MacBook Pro after upgrading to macOS Catalina. Having your battery last as long as possible is important, and I would be happy to help.
The battery drain and fan usage could be related to each other so I would like to start by seeing if we can further isolate potential causes. The next time the fan starts randomly, let's check the following:
I would also like to have you reset the SMC on your Mac, then test if there's any change to the battery usage or fan:
How to reset the System Management Controller (SMC) on your Mac - Apple Support
If you're still experiencing the behavior, here are some additional steps to take next:
About Mac notebook batteries - Apple Support
Cheers!
macOS Catalina causing fan issues?
