Short Answer: The fan is running fast because the computer is hot — either from dust, high CPU usage, or failing thermal paste.
Detailed: Modern computers control fan speed based on temperature. Loud fan = high temperature.
Common causes:
| Cause | How to diagnose | Fix |
|---|---|---|
| Dust blocking vents | Look at intake/exhaust vents — see dust? | Blow out with compressed air (can of air) |
| High CPU usage | Task Manager → CPU column | Find the culprit process, kill or update it |
| Old thermal paste | Laptop is 3+ years old, runs hot at idle | Replace thermal paste (requires disassembly) |
| Fan bearing failing | Grinding or rattling noise | Replace fan ($15–50) |
| Poor airflow | Laptop on soft surface (bed, pillow) | Use on hard, flat surface |
Quick temperature check:
Download HWMonitor or Open Hardware Monitor (free)
Check CPU temperature:
Idle (nothing running): 30–50°C (normal)
Light use (web browsing): 40–60°C
Heavy use (gaming, video editing): 70–90°C
Above 95°C → too hot, fan will scream
Warning: If your laptop shuts down suddenly under load, it's hitting thermal shutdown (usually 100–105°C). This damages components over time.
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