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I have a Macbook Pro 13-inch, 2017, Two Thunderbolt 3 ports, running Mojave 10.14.6. Recently the fan on the right side of the machine has been running at constant, full speed. I have tried reseting SMC but the fan is still running at top speed.
MacBook Pro 13″, macOS 10.14
As you have only one fan on that model, its running at full speed usually indicates that a temperature sensor has failed. The system is designed to do that so the computer does not overheat in the absencse of a functioning sensor.
To check for a cause, please see this Apple article:
Use Apple Diagnostics to test your Mac - Apple Support
There is a link within that article to a chart for interpreting any codes that AD returns.
As you have only one fan on that model, its running at full speed usually indicates that a temperature sensor has failed. The system is designed to do that so the computer does not overheat in the absencse of a functioning sensor.
To check for a cause, please see this Apple article:
Use Apple Diagnostics to test your Mac - Apple Support
There is a link within that article to a chart for interpreting any codes that AD returns.
I hope you have already gone through this link: About fans and fan noise in your Apple product - Apple Support
Please check if you have same behaviour in safe mode.
How to use safe mode on your Mac - Apple Support
Note: Safe mode prevents your Mac from loading certain software as it starts up, including login items, system extensions not required by macOS, and fonts not installed by macOS. It also does a basic check of your startup disk, similar to using First Aid in Disk Utility. And it deletes some system caches, including font caches and the kernel cache, which are automatically created again as needed.
Hi Sharhari, thank you for your reply. I have tried running in safe mode and still the same behaviour - the fan runs at constant full speed... I have tried resetting the SMC, but that did not seem to work either. Do you have any other thoughts on how to fix the problem?
Indeed as Allan suggested, please check with Apple Diagnostics.
If Apple Diagnostics didn't report any errors, then backup you data try to reinstall macOS.
Fan issues...
