How to Check if a Laptop Fan is Working: A Complete Guide

Has the laptop started to heat up more than usual, and the noise from the cooling system has almost disappeared? The problem may be a non-working fan. Cooler check is the first step to diagnosing overheating, but it needs to be done correctly so as not to worsen the situation. In this article we will analyze all the available methods: from simple visual inspections to the use of specialized utilities.

A faulty fan is one of the most common causes throttling (automatic performance degradation) and sudden laptop shutdowns. However, silence does not always mean breakdown: modern models (for example, MacBook Air M1/M2 or Dell XPS 13) may not turn on the cooler at all at low loads. How to distinguish the norm from the problem? Read on.

1. Visual inspection: when you can do without disassembly

The easiest way is to listen to your laptop. In normal mode the fan should turn on periodically (especially when running resource-intensive tasks) and make uniform noise. If you don't hear anything even under high load, this is an alarming signal. But before you panic, check:

• 🔊 Noise level in a quiet room. Sometimes the cooler works, but is almost silent (typical for models with passive cooling or liquid metal thermal paste).
• 💨 Air outlet from ventilation grilles. Place your hand near the side holes - if there is no flow, the problem is obvious.
• 🕳️ Dust clogged. Shine a flashlight on the grilles; dust accumulation may block the blades.

On some laptops (eg Lenovo ThinkPad or HP EliteBook) ventilation holes are located at the bottom. In this case, place the device on a flat surface and tilt it slightly - sometimes this is enough to hear the cooler working.

⚠️ Attention: Don't confuse fan noise with coil-squeal (high-frequency squeak of coils). The latter often occurs under high loads on the GPU and is not related to the cooling system.

2. Check via BIOS/UEFI: quick test without OS

If the laptop turns on but the operating system does not boot (or you suspect that Windows is blocking the cooler control), check the fan using BIOS. This method works on 90% of devices, including ASUS ROG, Acer Predator And MSI:

1. Turn off your laptop.
2. Turn it on and immediately press the key to enter the BIOS (usually F2, Del, Esc or F12 - depends on the model).
3. Find a section Hardware Monitor, PC Health or Fan Control (name varies).
4. Look at the value Fan Speed (rpm). If it is equal 0 RPM or N/A — the cooler does not rotate.

In some BIOS (for example, on Gigabyte or MSI) there is an option Fan Test — it forcibly starts the fan at maximum speed. If the noise does not appear after activation, the problem is hardware.

Manufacturer	BIOS entry key	Fan data section
Lenovo	F2 or Fn+F2	System Information → Fan
HP	Esc → F10	System Diagnostics → Fan Test
Dell	F12 (Boot Menu) → BIOS Setup	Thermal Management
ASUS	Del or F2	Monitor → Fan Speed

⚠️ Attention: On laptops with dual BIOS (for example, some models MSI) incorrect settings may result in a reset. Do not change parameters unless you are sure of their purpose.

3. Software diagnostics: utilities for Windows and macOS

Specialized software allows you not only to check the operation of the fan, but also to control its speed in real time. Here are the top utilities for different platforms:

• 🖥️ Windows:
  • HWMonitor (shows Fan Speed for all coolers).
  • SpeedFan (knows how to control speed, but requires caution).
  • Open Hardware Monitor (open analogue of HWMonitor).
• 🍎 macOS:
  • Macs Fan Control (for MacBook Pro/Air with Intel chips).
  • iStat Menus (temperature and speed monitoring).
• 🐧 Linux:
  • sensors (utility from the package lm-sensors).
  • Psensor (graphical interface).

Usage example HWMonitor:

1. Download the program from the official website (avoid repacks!).
2. Run as administrator.
3. Find a section Fans — all detected fans with current speeds will be displayed there (RPM).
4. Run a stress test (eg Prime95 or FurMark) and follow the changes.

If the program shows the speed, but you do not hear the noise, the laptop may have a liquid bearing fan (for example, ASUS Zephyrus G14), which operates almost silently.

4. Stress test: how to force the fan to turn on

Sometimes the cooler does not start due to low load. To check its functionality, you need artificially increase the temperature processor or video card. To do this use:

• 🔥 CPU: Prime95, LinX, AIDA64 Stress Test.
• 🎮 GPU: FurMark, 3DMark, Unigine Heaven.
• 💻 Universal: OCCT, BurnInTest.

Instructions for Prime95:

1. Download the program from the website mersenne.org.
2. Select Just Stress Testing → Blend (loads both CPU and RAM).
3. Click Start and watch the noise/rev. HWMonitor.
4. After 5-10 minutes, stop the test. If the fan does not turn on, the problem is confirmed.

⚠️ Attention: Do not run a stress test on a laptop that is already overheated battery (temperature higher 80°C). This can lead to swelling.

5. Disassembling the laptop: direct access to the fan

If software methods do not produce results, you will have to disassemble laptop. This is an extreme measure, but it allows you to accurately diagnose the problem. You will need:

• ⚒️ A set of screwdrivers (usually Phillips #00 And T5).
• 🧲 Anti-static wrist strap (or ground yourself by touching the metal PC case).
• 📸 Camera (to record the location of the screws).

Step by step instructions:

1. Turn off the laptop, remove the battery (if it is removable).
2. Unscrew the screws on the bottom cover (their locations can be found in repair manual for your model, for example on iFixit.com).
3. Carefully remove the cover, starting from the corner (it is often held on by latches).
4. Locate the fan (usually near the radiator). Check:
• 🌀 Do the blades rotate with a light blow.
• 🧹 Are there any accumulations of dust or hairs blocking rotation.
• 🔌 Is the cooler's power connector connected to the motherboard?

If the fan rotates freely, but does not start when you turn on the laptop, the problem is control chip or nutrition.

On some models (for example, MacBook Pro 2018+) the fan is soldered to the radiator. In this case, diagnostics will require complete disassembly with disconnecting the cooling system.

What to do if the screws won't come off?

If the screw is “licked” or does not budge, use a rubber band: place it on the head of the screw and press firmly with a screwdriver. An alternative is a special screw extractor.

6. Checking the connection and power supply of the fan

If the fan does not rotate even after cleaning, the problem may lie in electrical circuit. Here's what to check:

• 🔌 Power connector: Disconnect and reconnect the cooler plug to the motherboard. Sometimes contact is broken due to oxidation.
• 🔋 Voltage: Using a multimeter, check the voltage at the connector pins (usually 5V or 12V). Be careful - using a multimeter requires experience!
• 🛠️ Fan replacement: If you have a spare cooler, connect it instead of the old one. If the new one works, the problem is in the fan itself.

On laptops with dual fans (For example, MSI GS66 Stealth or Alienware m15) check both coolers - sometimes only one fails.

Symptom	Probable Cause	Solution
The fan does not rotate, but there is voltage	Cooler motor malfunction	Fan replacement
The fan jerks but does not start	Bearings clogged or blades blocked	Cleaning or Lubrication
The fan works, but the speed is not adjustable	Problem with control chip (EC/BIOS)	BIOS update or board repair

7. Alternative reasons for “silence”: when the fan is working properly

The absence of noise does not always mean a breakdown. Here are cases when the fan may not turn on, but this ok:

• 🌡️ Low temperature: Modern processors (eg. Apple M1/M2 or Intel 12th generation) hardly get warm in simple tasks.
• 🤖 Aggressive Power Management: The mode can be activated in the BIOS Silent Mode or Battery Saver, limiting speed.
• 🔄 Passive cooling: Some ultrabooks (eg. Dell XPS 13 9310) use only radiators without fans.
• 🔋 Battery operation: Many laptops reduce cooler speed when disconnected from the network.

To rule out these factors:

1. Connect your laptop to the network.
2. Run a resource-intensive task (for example, video rendering).
3. Check your Windows power settings (Control Panel → Power Options).

If after these steps the fan still does not turn on, proceed to the diagnostics described above.

Frequently asked questions (FAQ)

My laptop ASUS TUF suddenly became quieter, but gets hotter. What's the matter?

Most likely, the cooling system is clogged or the thermal paste has dried out. Try cleaning the fan from dust with compressed air. If this does not help, the thermal paste needs to be replaced.

B HWMonitor shows 0 RPM, but the laptop does not heat up. Is this normal?

Yes, if you have a passively cooled model (for example, MacBook Air M1) or a hybrid system (the fan only turns on at high loads). Check your device specifications.

Is it possible to lubricate a laptop fan without disassembling it?

No. To lubricate, you need to get to the bearing, which requires complete disassembly. Use only special fan lubricants (for example, Arctic MX-2).

After updating the BIOS the fan stopped working. What to do?

Return the previous BIOS version (if you have a backup) or reset the settings to factory settings (Load Default Settings in BIOS). If this does not help, the problem is in the firmware, contact service.

How much does it cost to replace a fan at a service center?

The cost depends on the model: from 1 500 ₽ for budget laptops up to 5 000 ₽ for gaming or MacBook. The price includes labor and spare parts.