"My fan sounds like a plane taking off" is one of the most common things we hear from customers bringing laptops in for a check-up. The good news: it's almost always fixable, and most causes are things you can prevent yourself once you know what to look for. Here's what's actually going on inside the laptop, and what to do about it.
Why laptops overheat in the first place
A laptop's processor generates heat the moment it's doing any real work, and it relies on a small fan pulling air across a heatsink to carry that heat away. When that airflow gets blocked or reduced, the processor gets hotter, the fan spins faster to compensate — which is where the loud noise comes from — and eventually the laptop slows itself down on purpose (this is called thermal throttling) to avoid damage. In Kenya specifically, dust and warm ambient temperatures make this happen faster than it would in a cooler, less dusty climate.
The usual suspects
1. Dust in the vents and fan
This is the single most common cause we see. Dust builds up on the heatsink fins and fan blades over months of normal use, acting like a blanket over the parts that are supposed to release heat. It's also the easiest one to prevent — and to fix.
2. Blocked vents from soft surfaces
Using a laptop directly on a bed, sofa, or your lap blocks the intake and exhaust vents underneath it, which starves the fan of airflow no matter how clean it is inside. This is a very fixable habit, not a hardware problem.
3. Too many demanding programs running at once
Dozens of open browser tabs, background apps, and auto-starting programs all quietly use CPU in the background, which keeps the processor — and therefore the fan — working harder than it needs to for what you're actually doing right now.
4. Old or dried-out thermal paste
Thermal paste is the material between the processor and the heatsink that helps heat transfer efficiently. On laptops several years old — including some Ex-UK units, which is exactly why we test and grade for this — that paste can dry out over time and stop doing its job well, causing higher running temperatures even with clean vents.
5. A worn-out fan
If the sound isn't just "loud" but grinding, rattling, or clicking, that's usually a mechanical issue with the fan bearing itself rather than dust or software — this one needs a physical fix, not a software fix.
What you can do yourself
- Use it on a hard, flat surface. A desk, table, or a laptop stand keeps the underside vents clear.
- Clean the external vents regularly. A can of compressed air blown gently into the vents (with the laptop off) clears surface dust — do this every couple of months if you're in a dusty environment.
- Close what you're not using. Unused browser tabs and background apps add up — check your Task Manager (Windows) or Activity Monitor (Mac) if the fan runs high even when you're doing something light.
- Keep it out of direct sun and hot cars. Ambient heat gives the fan less room to work with before things get too hot.
- Keep your operating system and drivers updated. Manufacturers occasionally release updates that improve how the fan curve responds to load.
- Consider a cooling pad if you regularly run demanding software (video editing, CAD, gaming) for long stretches.
When it's time for a professional check-up, not a DIY fix
A few signs mean it's worth having someone open the laptop properly rather than continuing to clean the outside vents:
- Grinding, rattling, or clicking noise from the fan, rather than just "loud".
- The laptop shuts down unexpectedly under load (a safety cutoff triggered by overheating).
- It's still running hot and loud immediately after a clean, external dust removal.
- Any burning smell — stop using it and get it checked immediately.
We'd genuinely discourage opening the chassis yourself unless you've done it before — it's easy to damage a ribbon cable or void a warranty doing something that a proper internal clean and, if needed, a thermal paste replacement would have solved safely.
Fan sounding rough, or laptop running hotter than it used to?
Message us a quick description of what you're hearing or noticing — we can usually tell you over WhatsApp whether it sounds like a simple clean or something that needs a closer look.