Here are some things you can troubleshoot about the noisy MacBook fan. But first, clear the vent of dust and dirt using a soft, clean cloth. Also, check that your MacBook is on a level, hard surface while using it. Use a certified Apple adapter when charging, also.See if the fan noise is reduced. If not, troubleshooting is inevitable.

Determine the cause of the CPU drain. When the MacBook is on, a number of processes and apps run in the background. Some of them require a lot of processing power and they drain the CPU. Double-click Activity Monitor after selecting Activities > Utilities in the Finder Window. The list of all open programs and tasks will be displayed, with the ones requiring the most resources at the top. To close a process or application, simply pick it and click the X icon at the top. This will make sure that your CPU is not being drained unnecessarily.

Your MacBook may have been infected by malware. Infected machines would tend to use higher amounts of overall system resources. The CPU will be drained or run short on memory. The device will possibly overheat, and the fans around the device would run faster and noisier than normal. Install an anti-virus software. Detect and remove the threats.

Upgrade to the latest available MacOS. An outdated software affects battery draining, performance degradation, and overheating, which might be related to a raise in fan speed with some jet-like sound. System Settings > General > Software Updates. Check for available MacOS versions. If you find one, update your device and check if the problem still persists.

Run a Hardware Test. If the fan is damaged or another issue is overheating your MacBook, run Apple Diagnostics to diagnose it. Turn off your MacBook and unplug all of your external devices before proceeding. For a MacBook equipped with a silicon CPU made by Apple,

  • Power on your MacBook

  • Holding down the power button causes it to turn on.

  • Release the power button when the startup options window displays.

  • Press Command-D to run the Diagnostics.

For an Intel-based MacBook,

  • Turn on your MacBook, then hold down the D key.

  • When the progress bar appears or when you’re asked to select a language, release the key

Apple Diagnostics will start running. When it finishes, you will get a list of any hardware problems.

If overheating is due to a hardware issue, only a professional repair service can fix it. They will replace or repair the defective hardware to ensure that the MacBook fan noise is reduced.

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