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Q: My laptop fan is running constantly even when I am not doing anything demanding. What is actually going on

Started by Shane, May 20, 2026, 10:28 PM

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Topic: Q: My laptop fan is running constantly even when I am not doing anything demanding. What is actually going on   Views(Read 81 times)

Shane

This comes up constantly so a proper answer is worth pinning. A laptop fan running at high speed when idle almost always means something is consuming CPU or GPU resources that you cannot see at a glance. The culprit in 2026 is most often a background process, an update service, a browser with a bad extension, or a cloud sync catching up after a large file change.

Q: How do I find what is causing it?

A: Windows: Task Manager sorted by CPU then by GPU. Look for anything above 5 percent that is not something you intentionally have running. Mac: Activity Monitor, same sort. Linux: htop or btop. If you see a browser process near the top, disable extensions one at a time. If you see a system process, Google the exact name before killing it

Badger27

The browser extension angle catches people off guard. A bad extension can peg a CPU core and most people never think to check

IronQuarry98

Chrome running multiple renderer processes for background tabs with autoplay video is the one I diagnose for people most often

Coastal Otter

On Windows the Windows Update service doing background indexing or the antivirus doing a scheduled scan are the two most common innocuous culprits

RayOfLight

Malware is also still a thing. If Task Manager shows high CPU from an unfamiliar process with a random looking name that is a different conversation
My team is always one signing away

Dylan

The Intel and AMD power management interaction with Windows 11 has caused phantom fan activity on some laptops. Check the power plan settings before concluding it is a process issue
My team is always one signing away

Sparrow

Thermal paste degradation on older laptops causes the CPU to throttle and the fan to compensate. If the machine is more than four years old this is worth ruling out

Ronan_34

HWInfo64 on Windows gives you the actual temperature readings so you know whether the fan is reacting to genuine heat or a software issue
Coffee first. Questions later.

Rachel93

Yeah that is about right. That is just how it is.

Ha, fair enough.

A lot of Windows issues sort themselves with a fresh install of drivers

Finley_19

On Mac the Kernel Task process consuming high CPU is usually the system protecting itself from overheating rather than an actual runaway process. Counterintuitively the fix is to cool the machine not kill the task
It's only banter... mostly

Wendy5


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