How to clean a laptop fan (with or without opening it)

Step by step: how to clean a laptop fan

Safety first. Shut the laptop down fully and unplug the charger before you start. If you open the case, disconnect the battery as your manual shows and ground yourself, because static can damage the components. Keep the compressed air can upright so it does not spray liquid propellant.

1. 1

   Shut down and unplug the laptop

   Save your work, shut the laptop down completely (not sleep) and unplug the charger and any accessories. Let it cool for 10 minutes if it was running hot. Remove the battery if it is the removable kind.

2. 2

   Find the intake and exhaust vents

   Look for slots on the bottom and the sides or back. The exhaust is where warm air blows out when the laptop runs; the intake is usually a grille on the bottom. Shine a flashlight in: gray fuzz on the fins behind the exhaust is the dust you are after.

3. 3

   Hold the fan still if you can see it

   If the fan blades are visible through a bottom grille, rest a plastic toothpick gently against one blade through the slots. This stops the air from spinning the fan far faster than it is built to turn.

4. 4

   Blow short bursts through the vents

   Fit the straw and hold the can upright. Spray two or three short bursts into the intake vent, then into the exhaust, from a few inches away. Work so dust blows out of the laptop, not deeper in; you should see a puff come out of the other vent.

5. 5

   Brush the grilles

   Sweep the outside of each vent with a soft, dry brush to lift the dust the air pushed to the surface. Wipe the area around the vents with a dry cloth.

6. 6

   Open the bottom panel only if needed and allowed

   If the fan stays loud and the vents still look clogged, check your manual for a bottom panel removal guide. If it allows it, remove the screws, disconnect the battery, wear an anti-static strap, hold the fan still and blow the dust off the fan blades and the copper fins.

7. 7

   Reassemble, power on and listen

   Close the panel and replace every screw. Start the laptop and run something demanding. A clean fan should spin up less often and the exhaust air should feel stronger.

How do you know your laptop fan needs cleaning?

A fan that runs loud or at full speed during light work, a hot underside, and a laptop that slows down under load are the usual signs. Dell explains that lint and dust on the cooling fins stop air flowing and make the fan work harder, and that blocked vents can overheat the processor, memory and other parts.

• The fan roars while you only browse or type.
• The exhaust air feels weak even though the fan is loud.
• The laptop shuts down or slows sharply when it gets hot.
• A grinding or rattling noise, which usually means a failing fan rather than dust. Lenovo says a grinding noise often indicates a failing or faulty fan that should be replaced promptly.

Placement matters too. Dell notes that a laptop on a bed or other soft surface can have its vents blocked by the fabric, which overheats it quickly, and Lenovo likewise recommends a flat, hard surface over beds or couches. Use it on a desk, a tray or a stand.

Compressed air, vacuum or opening it up: which method?

Compressed air through the vents is the right first step for almost everyone; opening the laptop is the second; a vacuum is not on the list. Here is how they compare.

Dell’s maintenance guide also says to turn off and unplug the computer, remove removable batteries, and never spray liquid into it. Compressed air is the only thing that should go through the vents.

When to take it to a repair shop instead

Stop and get it serviced if the laptop is sealed, the fan grinds, or it still overheats after a good cleaning. Those point to a worn fan or dried thermal paste, which cleaning will not fix.

• Many thin laptops, including MacBooks, are not designed for owners to open. Use the maker’s service or an authorized repair shop.
• If the laptop is under warranty, check the terms before you remove any screws.
• A fan that clicks, grinds or stops is a replacement part, not a cleaning job.

While the laptop is off, it is a good time to clean the keys and screen too; see how to clean a keyboard.

Mistakes to avoid

• Cleaning the vents while the laptop is asleep or plugged in.
• Letting compressed air spin the fan freely at high speed.
• Using a vacuum on the vents, which Dell says can create damaging static.
• Tipping the air can sideways or upside down so it sprays cold liquid.
• Opening a sealed laptop and voiding the warranty to fix what vent cleaning could handle.
• Using the laptop on a bed or couch, which blocks the intake and undoes the cleaning.