“Auto” keeps the default behavior, but opening up “Custom” allows you to set a specific RPM value, or set a target temperature. When it starts, you’ll see a list of all your fans and the option to set custom controls. It is possible that one of your fans is dead (theres physical damage to. Select Auto to return to the default settings. Launch Macs Fan Control, then click on the Custom button to manually adjust the speed of the Mac fans based on either a constant RPM value or a sensor-based temperature value. If you have another model, it most likely means that the fan did not report any data to MFC. Get Macs Fan Control free from the developer here.
Tip If you discovered that your fans had been running at either surprisingly low or high speed, it’s best to get them fixed by a professional.
Get started by downloading the Macs Fan Control app and moving it to the Applications folder. Why is Macs Fan Control reporting 0rpm for one of my fans Its ok if you have MacBook Pro 13 inch 2015/2016, these models turn off the fan when the CPU temperature is low enough. If you use Macs Fan Control to speed up your fans, youll also need to select Auto after the issue is resolved. It’s also possible that running fans at max speed for extended periods could lead to damage, so try not to torture your laptop. With either option, you should monitor the temperatures of your CPU and other components and make sure you’re not causing damage to your system.
Keep in mind that this will make your system run a lot hotter, and could lead to system instability if you let it go too far. On the other hand, if you hate fan noise, you can manually turn them down. This makes a lot of noise, which is why the auto-control tries to slow it down. Usually, this kicks in before the temperature gets too high, but you can manually push your CPU farther by turning the fan speed up farther than Apple usually allows. Your Mac throttles your CPU when it gets too hot, slowing it down significantly until the temperature gets under control.