Fan Control lets you adjust your fan's speed and thresholds to adapt it best to your Mac's current temperature. Thanks to sliders, you can set the lower and upper thresholds and base speed. A graph on the right of the interface shows you the speed to temperature ratio. If you move the different settings around, you'll see it adapts, never passing the original automatic fan speed.
Although it might be a bit difficult to tell which speed and thresholds are right for you, you can try out a few settings and see if your fan stops making sounds.
Fan Control is a handy preferences pane which allows you to adjust fan speed and thresholds to your MacBook's temperature.
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