MacBook Overheating or Loud Fan? Causes and Fixes

A MacBook that's hot to the touch or a fan that sounds like a hair dryer is hard to ignore. Some heat is normal under heavy work, but constant overheating slows your Mac down and wears out components faster. Here's how to figure out why your MacBook is overheating and what you can do about it.

Normal heat vs a real problem

It's normal for a MacBook to get warm and for the fans to spin up when you're exporting video, gaming, compiling code or running many browser tabs. It's a problem when:

• The fan runs loudly even when you're only reading email.
• The bottom case is uncomfortably hot during light use.
• The Mac slows down sharply, stutters or shuts down on its own.
• You hear grinding, rattling or clicking from the fan.

Note that fanless models, such as the MacBook Air with Apple silicon, don't make fan noise. When they get hot, they slow down to cool off instead, so heat shows up as sluggish performance.

Find the app that's working too hard

A single runaway process is the most common cause of a hot Mac.

1. Open Activity Monitor from Applications > Utilities.
2. Click the CPU tab and sort by % CPU.
3. Look for an app using a lot of CPU for a long time when it shouldn't be.
4. Save your work in that app, then quit it. If it won't close, select it and click the Stop button (the X) at the top of the window.

Browser tabs, video calls, cloud sync tools and outdated apps are frequent offenders. Learn to read the other tabs in our guide to using Activity Monitor.

Give your MacBook room to breathe

• Use a hard, flat surface. Beds, couches, pillows and blankets block airflow and trap heat.
• Keep vents clear. Depending on the model, air moves through vents along the hinge area and the sides or bottom. Don't block them.
• Watch the room temperature. Apple recommends using Mac notebooks in ambient temperatures between 10 and 35°C. Direct sun on a patio or a hot car can push a Mac into overheating fast.
• Consider a stand. Raising the back of the MacBook improves airflow underneath and is easier on your neck.

Software fixes that reduce heat

1. Restart your Mac if it's been running for days. This clears stuck processes.
2. Update macOS and your apps. Updates often fix bugs that cause high CPU use.
3. Trim login items in System Settings > General > Login Items (or System Preferences > Users & Groups on older macOS).
4. Close extra browser tabs and remove extensions you don't use.
5. On Intel Macs, if fans run at full speed with no load, try resetting the SMC.

If your Mac also feels slow in general, our tips to speed up a slow MacBook will help too.

Hardware causes: dust, thermal paste and worn fans

Over the years, dust and lint build up inside, clogging the fan and heat sink fins. Older MacBooks can also have dried-out thermal paste between the processor and the heat sink, which reduces how well heat moves away from the chip. A failing fan may make grinding noises, spin unevenly or stop entirely.

We don't recommend opening the Mac and spraying compressed air into the fan yourself. Spinning a fan too fast with air can damage it, and it's easy to damage delicate cables when opening the case.

Need MacBook fan or overheating repair in Ottawa?

If your MacBook still runs hot after these steps, it likely needs an internal cleaning, fresh thermal paste or a new fan. Fix Revolution handles fan replacement and overheating repairs with pickup and drop-off across Ottawa and Gatineau. Most repairs are done in 1 to 2 business days, and parts and labour carry a 90-day warranty. Get a free quote or call 613-265-4349.

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