Laptop overheating, or the fan is always loud? What is going on

A laptop that used to be quiet now sounds like it is trying to take off, gets too hot to keep on your lap, slows to a crawl in the middle of something, or just shuts off. That is heat, and it is one of the most fixable problems we see. The fan is not the problem; the fan is the laptop telling you about the problem.

Why it happens

• Dust. Every laptop pulls air in through the bottom and out through a tiny radiator, and after a couple of years that radiator is felted over with dust and pet hair. The fan runs flat out trying to push air through a blanket.
• Dried-out thermal paste. Between the processor and its cooler is a thin layer of paste that carries heat across. It dries and cracks with age, and heat stops moving, no matter how hard the fan works.
• A failing fan. Bearings wear out. A fan that rattles, grinds, buzzes, or spins up and down with no pattern is on its way out, and when it stops the laptop will shut itself off to survive.
• Blocked vents. Beds, couches, blankets and laps block the intake on the bottom. The laptop is not overheating because it is broken; it is suffocating.
• Runaway software. A program stuck at full tilt in the background, a browser with forty tabs, or malware quietly mining something will keep the fan loud on a perfectly clean machine.

What you can try at home

• Use it on a hard, flat surface for a day and see if anything changes. If it does, the vents were the problem.
• Open Task Manager (Ctrl+Shift+Esc on Windows) and sort by CPU. One program sitting at a high percentage while you are doing nothing is your culprit. Close it or uninstall it.
• Look at the exhaust vent with a flashlight. If you can see gray felt, the inside is worse.
• Restart it. Really. A laptop that has been asleep for three weeks has software stuck in corners.
• Install the updates it has been nagging about. Driver and firmware updates sometimes fix fan behavior outright.

What not to do

• Do not blast compressed air into the fan grille with the fan free to spin. It overspeeds the fan, can wreck the bearing, and mostly pushes dust deeper. If you must, hold the fan still with a toothpick through the grille and use short bursts.
• Do not run it on a pillow or the bed.
• Do not install a “fan control” or “cooling booster” app from a pop-up. That is usually the malware that is heating it up.
• Do not open it up and lift the cooler off the processor unless you have done it before. The paste under it is the whole point, and putting it back wrong makes it worse.

What we actually do about it

The repair for a hot laptop is unglamorous and it works: we open it up, clean the fan and the radiator properly, replace the dried thermal paste with fresh paste, replace the fan if the bearing is going, and check that nothing in the software is keeping the processor pinned. Then it goes back on the bench under load to prove it holds its temperature. Most of this is done a day or two after you approve the fix, backed by our 30-day warranty on parts and labor.

For everyday laptops it is part of our laptop repair. Gaming laptops run hotter by design and have more cooling to service, and those go through gaming PC repair, where we test under real game load, not an idle desktop.

When to bring it in

When a hard surface and Task Manager did not fix it, when the fan makes any grinding or rattling noise, when it shuts off under load, or when it is hot enough that you do not want it on your lap. Heat shortens the life of everything inside, so sooner is better than after it starts crashing. For the flat $60 we find the real cause and quote the fix before any work starts, with the $60 credited. Walk in Monday through Thursday, 9:00 to 5:30, or Friday by appointment, at 746 S Arnold St Suite 3, the black door with our logo on it, straight ahead when you pull in, up the steps. Or book a drop-off online. Prices are on our prices page.