# How to Fix “PC fan randomly speeds up and slows down” issue **URL:** https://www.compsmag.com/blogs/fix-pc-fan-randomly-speeds-up-and-slows-down/ **Author:** Ayushi Chauhan **Published:** 2024-01-16 **Updated:** 2024-01-16 **Categories:** Blogs **Reading Time:** 6 min --- How to Fix "[PC](https://compsmag.com/best/desktop-computer/)fan randomly speeds up and slows down" issue: Do you hear unusual noises coming from your [computer](https://compsmag.com/best/computers/), the kind that sound like a rollercoaster of loud and soft sounds? The tech aficionado need not be concerned! We can work together to find a solution to this peculiar fan behaviour, which is a widespread problem. In this tutorial, we will investigate the reasons behind the erratic behavior of your computer's fans and offer straightforward methods to restore the tranquilly and quietness to your personal computer. Putting first things first, let's dispel a common misunderstanding: a slight fluctuation in the speed of the fan is quite normal. When you place a lot of strain on your computer, it will become hot, and the fans will speed up in order to cool it down. This is similar to how your body sweats when you are working out. On the other hand, if your followers are acting in a manner that is erratic, inconsistent, or simply irritating, there may be a more fundamental issue at hand. Take out your fictitious toolkit, and let's begin our investigation into the possible factors that are contributing to this fan frenzy. It's possible that the noise is caused by nothing more than a little dust, or it might be that a cable is causing your cooling system to malfunction. Through the process of recognising and resolving these difficulties, you will be able to make your computer as quiet and peaceful as a peaceful evening. Here are the simple ways how to Fix "PC fan randomly speeds up and slows down" issue. ## What is "PC fan randomly speeds up and slows down" issue There are a number of causes that can be responsible for the issue of the computer fan randomly speeding up and slowing down. These factors are not overly difficult to comprehend. Alterations in temperature, the accumulation of dust, and problems with the software on the computer are some examples of these symptoms. When the fan attempts to alter its speed based on how hot the central processing unit ([CPU](https://compsmag.com/best/cpus/)) or graphics processing unit (GPU) gets, this is a common cause of this problem. ![How to Fix "PC fan randomly speeds up and slows down" issue](https://compsmag.com/wp-content/uploads/2024/01/image-370.png) If there is a significant amount of dust on the fan blades or inside the computer case, it has the potential to disrupt the flow of air and cause the fan to behave in an unusual manner. Problems with the software on the computer, such as bugs or drivers that have become obsolete, might also cause the fan to operate in an unusual manner to take place. In order to resolve this issue, users can take a few straightforward actions. ## Causes for "PC fan randomly speeds up and slows down" issue 1. **The accumulation of dust:**an accumulation of dust on the fan blades or within the computer casing can cause airflow to be disrupted, which in turn can cause the fan speed to be erratic. 2. **Problems with the Hardware:**It is possible for the fan to behave in an unforeseen manner due to faulty components, such as a temperature sensor or power supply unit that is not functioning properly. 3. **Errors in Information Technology:**Sometimes, problems with the software or drivers of the system can interfere with the systems that control the fans, which can lead to fluctuations in the speeds of the fans. 4. **It's getting too hot:**If the components of the computer become very heated, the fan may speed up in order to better cool them down. An excessive amount of use, insufficient cooling, or a cooling system that is not functioning properly can all lead to overheating. 5. **Problems with the Power Supply:** Variations in the voltage of the power supply or problems with the power distribution system can have an effect on the performance of the fan. 6. **BIOS/UEFI Settings:**Unpredictable fan speeds may be caused by settings in the system's BIOS or UEFI firmware that are either incorrect or out of date. 7. **Age and Wear:** In the course of time, fans may become worn out or have mechanical problems, which might result in unpredictable operations. ## How to Fix "PC fan randomly speeds up and slows down" issue ### Check your BIOS fan settings ![How to Fix "PC fan randomly speeds up and slows down" issue](https://compsmag.com/wp-content/uploads/2024/01/image-368.png) 1. Adjust **fan speeds** in the **BIOS**on most **PCs.** 2. Look for **"Fan Control"** or **similar options.** 3. Try a **"Standard"** or **"Quiet"** fan curve. 4. Gradually **increase fan speed**with **temperature**. 5. Avoid **"Performance"** curves if your **PC**isn't **overheating**during **normal use.** ### Update your BIOS and drivers 1. Outdated **BIOS and drivers** may lead to **fan control issues**. 2. Visit your **motherboard manufacturer's website** to find **BIOS updates**. 3. Use your **operating system's update tool** to refresh your **chipset and graphics drivers**. ### Monitor your PC's temperature ![How to Fix "PC fan randomly speeds up and slows down" issue](https://compsmag.com/wp-content/uploads/2024/01/image-369.png) 1. **Use software** such as **HWMonitor [Official Website](https://www.cpuid.com/softwares/hwmonitor.html)**or **Core Temp [Official Website](https://www.alcpu.com/CoreTemp/)** to **monitor** your **CPU** and **GPU temperatures**. 2. If **temperatures**are **consistently high** (above **80°C for CPU** and **90°C for GPU**), you require **additional cooling**. ### Improve your airflow 1. **Open** your **PC case.** 2. **Clean**out **dust**with **compressed air**. 3. Make sure all case **fans** are **spinning** and **unobstructed**. 4. **Add** more **case fans**if **necessary**, especially for **hot components** like the **GPU.** ### Consider replacing the fan 1. **Check** your **fan**for **signs**of being old, worn, or **damaged.** 2. If **issues** are found, consider **replacement.** 3. Choose a **high-quality fan**that is **compatible** with your **PC.** 4. **Install** the new **fan**to **ensure proper functionality.** ## Conclusion It is necessary to adopt a methodical approach in order to identify and resolve probable issues in order to resolve the problem of your personal computer fan randomly speeding up and slowing down. You should begin by cleaning the interior of your computer, ensuring that there is adequate airflow, and checking for any significant accumulation of dust. If you follow these straightforward measures, you will be able to observe a more consistent and smooth performance from your personal computer. This will ensure that the fan operates appropriately and does not experience any sudden variations in speed. By implementing these changes, you will be able to improve the quality of your experience with your computer. ## Question and Answer --- *End of Article*