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How to Fix a CPU Cooler Making a Buzzing Noise

Hearing weird noises coming from your PC, especially your CPU cooler is never a good sign. It almost always signals an issue, and the seriousness depends on your luck.

Today, we’re diving into the different causes behind your CPU cooler’s buzzing sounds.

Whether it’s a minor hiccup or a sign of something bigger, we’ve got you covered with clear explanations and easy solutions. Let’s start troubleshooting your CPU cooler together!

Key Takeaways

  1. A buzzing CPU cooler often indicates fan issues, such as damaged blades or worn bearings, and replacing the fan is usually the best solution.
  2. High CPU temperatures can cause the cooler to work harder and buzz, often due to dust buildup, overclocking, or old thermal paste, and addressing these issues can reduce noise.
  3. For AIO coolers, buzzing sounds can be caused by air bubbles in the liquid or a worn-out plastic disk pad on the pump, requiring simple tilting or professional repair.

Faulty or Worn Out Fan

A buzzing noise from a CPU cooler often points to a problem with the fan. The fan blades can become damaged or unbalanced, causing them to spin unevenly and create noise.

Additionally, the fan’s bearings, which help it rotate smoothly, can wear out over time. This wear and tear leads to a rough rotation and results in a buzzing sound.

The most effective solution to stop this noise is to replace the fan.

High CPU Temperature

Moving to our next point, high CPU temperature can also cause your cooler to buzz. When your CPU gets too hot, the cooler works harder to cool it down, often running at maximum speed.

Not all coolers can stay quiet at these high speeds, leading to a buzzing sound. This overheating can be due to various reasons.

For instance, dust buildup can insulate heat, making it harder for the cooler to do its job.

Overclocking, where the CPU is pushed beyond its standard limits, generates additional heat. Another common issue is old or improperly applied thermal paste. This paste helps transfer heat from the CPU to the cooler, and if it’s not working well, the CPU gets hotter.

To tackle the buzzing, investigate these potential causes and address them – clean the dust, reconsider overclocking limits, or reapply thermal paste.

Loose Wire Interference

Loose Wire interfering with the cpu cooler

Another culprit behind buzzing noises is loose wire interference. In computer builds where cable management isn’t optimal, wires can stray into the path of the fan blades. When this happens, the fan can hit these wires as it spins, creating a buzzing or rattling sound.

The solution is straightforward – inspect the inside of your computer case and ensure that all wires are neatly tucked away and secured.

Air Bubbles in AIO Coolers

For owners of All-In-One (AIO) coolers, a common noise issue is caused by air bubbles trapped in the cooling liquid.

These coolers use a liquid to transfer heat, but sometimes, air bubbles get trapped in this liquid. When these bubbles move through the cooler’s pump, they can cause a buzzing or gurgling sound.

The solution can be as simple as gently tilting the PC. This movement helps move the bubbles through the system and out of the pump area, reducing or eliminating the noise. It’s a quick and easy fix that can be done without needing to open up the computer or replace any parts.

Worn Out Plastic Disk Pad on the Pump

CPU cooler's pump

Another issue specific to AIO coolers is the deterioration of the plastic disk pad on the pump.

Over time, this pad can wear out, leading to a noticeable noise when the PC starts. This sound is a sign that the pad, which helps in the smooth operation of the pump, is no longer functioning effectively.

The only way to fix this problem is to replace the worn-out pad. However, this involves disassembling the AIO cooler, a task that can be quite complex and is not recommended for beginners.

For those who are not experienced in handling computer hardware, the safer options are to either take the cooler to a professional for repair or consider replacing the entire cooler.


I hope this article helped you pinpoint and fix the buzzing noise from your CPU cooler. Did you find the right solution? Share your experience in the comments! Let us know what the issue was and how you solved it.

If you have any questions or need more advice, don’t hesitate to ask. Your questions are important and can help others too.

And, if you’re thinking about getting a new cooler, be sure to check out our guide on choosing the right CPU cooler for your needs.

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Hi, I’m Abdelkader, a gamer and the founder of Gamer Around. I’ve been into gaming for the past 20 years and I love to share my passion and experience with you. Throughout these years, I managed to build a decent amount of knowledge and experience in PC hardware, but I’m always learning and improving.

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