In most cases, the fan noise is an adequate reaction of the computer to heat during operation, however, sometimes a strong hum or unnatural rattling may indicate a malfunction of the cooling system.

Why is MacBook Noisy?

Despite the fact that different MacBook models have a similar layout, the specifics of their cooling circuit may differ:

  • If your MacBook Air is noisy while in use, the problem may be that the processor is overheated, since it is the central chip that bears all the calculations (including graphics);
  • If there are noisy fans on the MacBook Pro, the cause may be overheating of both the processor and the discrete video card (except for the basic models with integrated graphics).

However, if your MacBook is buzzing during work, the problem is not always directly related to overheating:

  • Thermal sensor or controller malfunction, software failure;
  • Cooler malfunction;
  • Damage to the heat pipe;
  • Worn thermal paste.

How to Solve the Problem and why is it Important?

As we have already noted, overheating as the main cause of noise can lead to a defect in key elements of the motherboard, such as the central and graphics processor, RAM, or video memory. If the fan is very noisy on your MacBook, you should check the temperature sensors readings (for example, using the iStat Menus program) – the device temperature should remain between 30-50 degrees in normal mode and 50-70 degrees under load.

Read more: How to Display CPU Temperature in the macOS Menu Bar?

Next, we will examine in more detail the main causes of noise, methods for their elimination and possible consequences.

Resetting the System Management Controller (SMC)

One of the troubleshooting technique to fix MacBook noisy is to reset the System Management Controller (SMC). The methods to reset SMC are different, and it depends upon the kind of Mac you are having. Below are the three ways, choose the one which suits your Mac.

  • First of all, “Shut down” your Mac and plug in the MagSafe;
  • Next, hold down “Shift” + ”Control” + “Option” + “Power button” all at once for approximately 10 seconds;
  • Then, release the keys at the same time;
  • Finally, boot up your Mac.
How to Fix Fan Noise & Overheating of your Mac?


After a year and a half of active work, the cooling system of the laptop inevitably clogs up with settled dust, which prevents normal air circulation and, as a result, cooling of the radiator.

With the help of special equipment, the specialists of the service center carry out cleaning and preventive maintenance of the cooling system with the replacement of thermal paste and lubrication of coolers;

You can solve the problem yourself, but MacBook proprietary screws require a special screwdriver.

Defective Cooler

Unusual noises and rattling of the blades may indicate a malfunction of the cooler due to defects or mechanical defects.

Often, extraneous noise can be eliminated by completing the lubrication of the cooler; however, prolonged work with a faulty fan can lead to its rapid deterioration and, as a result, to more serious defects.

Heat Pipe Malfunction

If you have a MacBook buzzing right from the start of the system, the problem may be a thermal tube malfunction, which leads to inefficient heat dissipation.

If the elements of the system are in good condition, the MacBook heat pipe can be quickly replaced. Otherwise, you may need to replace the chip.

Preventing Overheating and Malfunctions

If a fan is constantly running on your MacBook, make sure the computer does not overheat and does not interfere with normal air intake (for example, if the computer is on the bed).


In order to avoid serious defects, you should avoid overheating and, if possible, perform regular cleaning of the cooling system (once every 6-12 months). If you want to save personal time and maximize the life of the computer, you should entrust this work to specialists.

It’s the best time to ask questions and give us your feedback in comments.


Hi there! My Name is Vincent Lago! My goal is to share insightful reviews, guides, and manuals for people looking to know more about current solutions for Apple hardware and OS. I have years of technological background knowledge including owning a custom iMacs & PCs which was using for different types of business. And now, I want to share my experience with you.

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