Laptop "Fan" Always at 100% Speed
4.5
The fan is extremely loud and never slows down, even when you aren't doing anything.
Symptoms
- Loud fan
- Constant noise
- Cool air blowing
Possible Causes
- Stuck background process
- Corrupt BIOS/EC
- Failing thermal sensor
Step-by-Step Fix
1
Check Task Manager
Look for any app using 20-50% CPU while idle.
2
Reset the EC (Embedded Controller)
Usually involves a specific power button hold combo (check manufacturer).
3
Update BIOS
Manufacturers often fix "fan curves" in BIOS updates.
When to See a Technician
If the air blowing out is COLD but the fan is MAX, it's a sensor or software issue, not an overheating issue.
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