Laptop Overheating? Causes, Safe Fixes and When to Get It Repaired

A laptop that runs hot, roars its fan constantly or shuts down without warning is usually telling you its cooling system can’t keep up. Laptops pack powerful components into tight spaces, so even a little dust or a soft surface blocking the vents can tip the balance. Here’s how to find the cause and fix it safely.

Signs your laptop is overheating

• The fan runs loudly even during light tasks such as browsing.
• The keyboard, underside or area above the keyboard is uncomfortably hot.
• Performance drops sharply after a few minutes of use (thermal throttling).
• The laptop shuts down or restarts suddenly, especially under load.
• The battery drains faster than usual or charging slows down.

Stop using the laptop immediately and unplug it if you notice a swollen battery (the case bulging, the touchpad lifting or the keyboard deforming), a burning or chemical smell, or smoke. A damaged lithium-ion battery is a fire risk and must be handled by a professional.

Step 1: Check the surface and airflow

Most laptops draw cool air in through vents on the bottom or sides and exhaust it at the back or side. Beds, sofas, cushions and your lap block those vents.

• Use the laptop on a hard, flat surface such as a desk or table.
• Leave a few centimetres of space around the exhaust vents.
• Avoid direct sunlight and hot rooms where possible.

This simple change fixes a surprising number of cases.

Step 2: Find out what’s making it work hard

Heat follows workload. Open Task Manager (Ctrl+Shift+Esc), select Processes and click the CPU column to sort. Look for anything using a lot of processor time while you’re not actively doing anything demanding.

Common causes:

• a web browser with many tabs, especially video or heavy web apps;
• background updates, cloud sync or antivirus scans (usually temporary);
• a stuck process using 100% of one core – ending it often brings temperatures straight down;
• malware such as cryptocurrency miners – run a full scan with Windows Security.

If the laptop is also slow to start, our guide to speeding up Windows 11 startup covers trimming startup apps, which also reduces background heat.

To see temperatures, Task Manager’s Performance › GPU page shows GPU temperature on many systems. Your laptop manufacturer’s utility (often pre-installed) may show CPU temperature and fan speed. Several free third-party monitoring tools also exist – download them only from the developer’s official website.

Step 3: Adjust power settings

Windows 11’s power mode controls how hard the processor pushes. Open Settings › System › Power & battery and set Power mode to Balanced or Best power efficiency rather than Best performance. Many manufacturers also provide their own thermal or “quiet” modes in their control apps; a quieter mode trades some speed for lower temperatures.

Step 4: Update BIOS, drivers and the manufacturer’s utility

Laptop makers regularly release firmware and driver updates that improve fan control and power management. Check your manufacturer’s support site (search for your exact model number, usually printed on a sticker underneath) or use their update app.

Step 5: Clean the vents

Dust and pet hair build up on the fan and the fine metal fins of the heatsink over time, choking airflow. Cleaning the outside of the vents is safe for anyone:

1. Shut the laptop down completely and unplug it.
2. Use a can of compressed air (or an electric air duster) in short bursts at the vents.
3. Hold the fan still through the vent with a cotton bud or toothpick if you can reach it – letting a fan spin too fast from compressed air can damage it.
4. Blow from the exhaust side as well as the intake side.

Avoid vacuum cleaners directly on electronics, as they can create static.

Step 6: Internal cleaning and thermal paste (advanced)

If temperatures stay high, the fan and heatsink may need cleaning from the inside, and the thermal paste between the processor and heatsink may have dried out after several years. This involves removing the bottom panel and sometimes the cooling assembly.

• Check your warranty first – opening some laptops can affect it.
• Look for the manufacturer’s service manual for your model, which shows the safe procedure.
• Disconnect the battery inside before working on internal components, and use an anti-static strap or touch a grounded metal object first.

If you’re not comfortable with this, a repair shop can clean the cooling system and replace thermal paste relatively cheaply.

Step 7: Consider a cooling pad

A cooling pad with fans can help laptops that pull air in from underneath, and simply raising the back of the laptop improves airflow. These are aids rather than fixes – they won’t overcome a blocked or failing fan.

When to get professional help

• The fan makes grinding, clicking or rattling noises, or doesn’t spin at all.
• The laptop shuts down within minutes even after cleaning.
• You see any sign of battery swelling.
• The laptop has been dropped or exposed to liquid.
• The laptop won't power on at all – see our diagnosis checklist for a computer that won't turn on.

A failing fan is a common, replaceable part on most laptops.

Conclusion

Most overheating comes down to blocked airflow, dust or an unusually heavy workload. Use a hard surface, check Task Manager for runaway processes, choose a balanced power mode and clean the vents. If the problem persists, an internal clean or fan replacement usually restores normal temperatures – and any battery swelling needs professional attention straight away.