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What Causes Computer To Overheat? Fix Overheating Computers

Overheating is very frustrating because it slows down your PC. So, do you want to know what causes computers to overheat?

A computer’s operation is dependent on several important components. Unfortunately, the majority of them produce heat. To determine why computers overheat, we will investigate each component and explain why and how to repair it.

A computer overheats due to insufficient internal ventilation, excessive external temperature, one or more components not being efficiently cooled, or certain parts overworking. Inadequate cooling, general failure, or ageing can all be blamed for faulty components that generate excessive heat.

What causes computers to overheat?

First, we’ll look at why desktop computers overheat. Then, after going over all of the causes and solutions, we’ll go into why computers overheat.

Internal airflow is inadequate

The following are the most common causes of a lack of ventilation within a computer case.


Dust is frequently to blame for a computer with poor ventilation. This is a simple and apparent remedy.

Use pressurised air from a can or a full-sized air compressor to clean the interior and exterior of the computer.

Use a tiny brush to assist with cleaning if necessary.

Ensure that all components, not only the fans and intake vents or filters, are dust-free.

Before beginning the cleaning procedure, ensure the computer is unplugged and carried outside. Wear a dust mask as well so you don’t breathe in the dust. Eye protection is also essential.

Faulty fans can cause overheating of PCs.

Fans tend to spin slowly or perhaps cease spinning entirely as time passes and dust deposits accumulate. This is especially true if they aren’t kept up with.

Fans with sleeves are the most prone to wear and damage. Fans can seize in varying degrees of severity.

Watch how a fan revolves and comes to a stop if you spin it with your finger (first unplug it). If it abruptly stops, it indicates that it is not spinning as freely as it should and should be replaced.

Some people choose to disassemble the fan and service it, however I would advise against it. Replacing the fan is a relatively inexpensive and guaranteed solution to the problem.

A more complete test necessitates the use of a software tool or BIOS to set the fan to 100% to confirm that it spins up sufficiently to provide proper cooling.

It should achieve RPMs similar to those indicated on the product page of the individual fan model on the manufacturer’s website.

There aren’t enough fans.

A minimum of three fans should be included in most computers with a mid-tower or larger casing.

A minimum of five fans is suggested.

Be cautious in tiny form factor scenarios. Some have inadequate designs that do not allow for a single large enough fan to provide adequate cooling.

In this scenario, I urge that the case be replaced with something better.

To achieve optimum airflow in a tiny form factor computer case, you need at least one decent 80mm fan.

Fans are not properly setup.

As you’re probably aware, fans only blow air in one direction.

Air will grow stale and parts will overheat if your fans work against each other and do not push air through your case.

Make sure you have adequate fans strategically placed to pull in and move out enough air.

Small arrows represent the rotation of the blades and the direction of the airflow in fans.

If you want to learn more about how to achieve this, please read our in-depth post on PC airflow settings.

Additionally, ensure that the CPU fan or fans are blowing air through the CPU cooler in the same direction as the airflow within the case.

You don’t want the air from the CPU cooler to flow against the movement of the air within the computer case, resulting in interrupted airflow.

When the temperature rises, fans do not spin quickly enough.

This is a major issue that might be difficult to detect. You believe your PC is adequately cooled, but it isn’t.

You should hear fans speed up when you play a game or put your computer through its paces.

Case fans, CPU fans, and graphics card fans are all examples of this.

This is known as a fan speed temperature curve. As the temperature rises, so do your fans, requiring more air to cool your computer.

Your BIOS or software often regulates fans.

When employing fan controllers to power your fans, software is typically employed.

The room is too hot (Open some windows)

The external ambient temperature significantly impacts how hot your computer becomes.

Where I reside, for example, it becomes exceedingly humid and hot, making cooling difficult.

In this case, ensure sure the room has sufficiently cooled down before utilizing your computer.

The apparent first step is to open all windows and doors. After that, experiment with cooling fans, a bigger computer case, and an air conditioner.

Invest in a larger computer case

Sometimes, even after trying everything, you can’t seem to get your room temperature down low enough, or you’ve maxed out your case fans, but your computer still overheats.

I’ve been there before. In this case, I would recommend a larger computer case.

Having larger spaces around the components inside your computer is extremely beneficial.

Not only that, but you now have more room to install additional cooling fans.

I conducted my own tests and discovered that a larger case significantly helps keep your computer cooler.

One simple test to see if a larger case will solve your problem is to remove the case lid and turn on your computer.

Use it to compare the temperatures of the different components. If you get a positive result, a larger case will most likely help.