A laptop fan that’s failing, clogged with dust, or stuck at low speed lets your CPU overheat, which leads to slowdowns, loud whirring, random shutdowns, and a shorter laptop life. Windows 10 doesn’t show fan speed anywhere in Settings or Task Manager, but you can still check whether your fan is working properly. This guide covers quick physical checks, free tools that read fan RPM and temperatures, your manufacturer’s built-in fan test, and what to do if the fan isn’t keeping up.
Quick Answer
Install a free hardware monitor such as HWiNFO or HWMonitor, open its sensor view, and watch fan speed (RPM) and CPU temperature while the laptop is idle and then under load. A healthy fan speeds up as temperature rises and keeps the CPU below about 90°C under heavy load. For a definitive answer, run your laptop maker’s built-in hardware diagnostics fan test.
Step 1: Quick Physical Checks
- Listen: Run something demanding (a game, a video export, or many browser tabs). You should hear the fan get louder. Grinding, clicking, or rattling suggests a failing bearing or debris.
- Feel the exhaust: Warm air should come from the vent (usually on the side or back) when the laptop is busy. Weak or no airflow with a hot laptop points to a blocked vent or dead fan.
- Look: Shine a flashlight into the vents. Visible dust or lint means cleaning is overdue.
Some laptops stop the fan completely when idle (0 RPM). That’s normal if it starts spinning under load.
Step 2: Read Fan Speed and Temperatures With Free Software
Windows 10 can’t report fan RPM on its own, so use a monitoring tool:
- HWiNFO (hwinfo.com): Choose Sensors-only at startup. Look for fan readings (often under the embedded controller or motherboard section) and CPU Package temperature. It resets min/max values with the clock icon.
- HWMonitor (cpuid.com): Simple list of temperatures, voltages, and fan speeds with min and max.
Not every laptop exposes fan RPM to Windows; some only report temperatures. If you see no fan entries, use temperature behavior (next step) or your manufacturer’s tools. Task Manager can show GPU temperature for dedicated graphics on the Performance tab, but not CPU temperature or fan speed.
Step 3: Test the Fan Under Load
- With the monitoring tool open, let the laptop idle for 5 minutes, plugged in. Note CPU temperature and fan RPM.
- Create a load: run a CPU benchmark such as Cinebench, or a demanding game, for 10 minutes.
- Watch the readings. The fan RPM should rise within a minute or two, and temperatures should level off rather than climb continuously.
- Stop the load and check that temperatures drop within a few minutes and the fan slows down.
What healthy numbers look like
| Reading | Typical healthy range | Warning sign |
|---|---|---|
| CPU at idle | 35–55°C | Above 65°C while doing nothing |
| CPU under heavy load | 70–90°C | Constantly hitting 95–100°C, or performance dropping (thermal throttling) |
| Fan speed under load | Rises noticeably (often 3,000–5,000+ RPM) | Stays at 0 or very low RPM while hot |
Exact limits vary by processor and laptop model. Thin gaming laptops often run hotter by design. Check your CPU’s maximum temperature on the chipmaker’s site if unsure.
Step 4: Run the Manufacturer’s Fan Test
Most laptop makers include hardware diagnostics that test the fan directly, outside Windows:
- HP: Turn on the laptop and press Esc repeatedly, then F2 for HP PC Hardware Diagnostics (UEFI). Choose Component Tests > Cooling (or System Fan).
- Dell: Press F12 at startup and choose Diagnostics (ePSA/SupportAssist pre-boot), which includes a fan test.
- Lenovo: Use Lenovo Diagnostics or Lenovo Vantage for hardware scans.
- Others: Check your model’s support page; keys and tool names vary. Some BIOS/UEFI setup screens also show fan speed under a hardware monitor page.
A failed fan test usually comes with an error code you can give to support for a warranty repair.
Step 5: Check Windows Cooling Settings
- Open Control Panel > Hardware and Sound > Power Options.
- Click Change plan settings > Change advanced power settings.
- Expand Processor power management > System cooling policy and set it to Active (fan speeds up before slowing the CPU). Not all laptops show this option.
Many laptops also have fan or thermal modes (Quiet, Balanced, Performance) in the maker’s app, such as MyASUS, Armoury Crate, Lenovo Vantage, or HP Command Center. A Quiet mode can make the fan seem weak. See our guide to turning on a laptop fan in Windows 10 for more control options.
If the Fan Isn’t Performing Well
- Clean the vents: Shut down and unplug the laptop. Blow short bursts of compressed air into the intake and exhaust vents, holding the fan still with a toothpick if you can reach it, so it doesn’t over-spin.
- Improve airflow: Use the laptop on a hard, flat surface, not a bed or lap. A cooling pad can help.
- Update BIOS and drivers: Fan curves are controlled by firmware; updates sometimes fix fan behavior.
- Check for runaway processes: Open Task Manager and sort by CPU. A background app at high CPU keeps the fan spinning.
- Replace the fan: Noisy, grinding, or dead fans need replacement. It’s a common, inexpensive repair; use the manufacturer or a repair shop if you’re not comfortable opening the laptop, and check warranty first.
Frequently Asked Questions
Can I control fan speed in Windows 10?
Windows has no fan speed slider. Use your manufacturer’s app or BIOS options. Third-party fan control tools only work on some laptops because many lock fan control in firmware.
Is a loud fan a bad sign?
Loud under heavy load is normal. Loud while idle, or with grinding noises, suggests dust, a background process, or a failing fan.
Summary
- Listen and feel for airflow under load.
- Use HWiNFO or HWMonitor to watch fan RPM and CPU temperature.
- Run a load test and confirm the fan ramps up and temperatures level off.
- Run the manufacturer’s fan diagnostic for a definitive result.
- Clean the vents, adjust cooling modes, or replace the fan if needed.
Kermit Matthews runs Live2Tech from just outside Philadelphia. He is an IT specialist with over 20 years of experience, from a university help desk to small-business IT, IT management and his own consulting practice, and has written tech guides full time since 2020. Steps are checked against the current software on a real device or the maker’s official documentation. More about Kermit.