What Is An EGR Cooler?

Charlotte Miller

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What Is An EGR Cooler

Are you curious to know what is an EGR cooler? You have come to the right place as I am going to tell you everything about an EGR cooler in a very simple explanation. Without further discussion let’s begin to know what is an EGR cooler?

An EGR cooler, also known as an exhaust gas recirculation cooler, is an essential component in modern diesel engines. In this blog, we will explore what an EGR cooler is, how it works, and why it is important for diesel engine performance.

What Is An EGR Cooler?

An EGR cooler is a device that is designed to cool the exhaust gases that are recirculated back into the engine through the EGR system. This is important because high temperatures can cause the recirculated exhaust gases to expand, which can lead to engine knocking and other problems.

The EGR cooler is typically located near the engine block and is connected to the EGR valve, which controls the flow of exhaust gases into the engine.

How Does An EGR Cooler Work?

When the engine is running, a portion of the exhaust gases is redirected through the EGR valve and into the EGR cooler. The EGR cooler is designed to pass the exhaust gases through a series of small tubes that are surrounded by coolant. The coolant absorbs the heat from the exhaust gases, which cools them down before they are recirculated back into the engine.

The cooled exhaust gases are less likely to cause engine knock or other problems, which can improve overall engine performance.

Why Is An EGR Cooler Important?

An EGR cooler is important because it helps to reduce emissions and improve fuel efficiency in diesel engines. By recirculating exhaust gases back into the engine, the engine is able to burn fuel more efficiently, which reduces the number of emissions that are released into the environment.

Additionally, an EGR cooler can help to extend the life of the engine by reducing the amount of stress and strain that is placed on the engine components. This can help to prevent engine damage and costly repairs down the line.


In conclusion, an EGR cooler is an important component in modern diesel engines that helps to reduce emissions, improve fuel efficiency, and extend the life of the engine. By cooling the exhaust gases before they are recirculated back into the engine, the EGR cooler helps to improve engine performance and prevent engine knock and other problems. If you own a diesel engine, it is important to make sure that your EGR cooler is functioning properly and is well-maintained to ensure optimal engine performance and longevity.

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What Is The Purpose Of An EGR Cooler?

The cooler is a vital part of the EGR: it dilutes the air-fuel mixture in the cylinder with cooled exhaust gas, lowering the combustion temperature. This stops the engine from overheating and the lower temperatures improve the performance of hot components like the cylinder head.

How Much Does It Cost To Replace An EGR Cooler?

For a replacement EGR cooler, you could be looking at between $270 and $3700, which will vary from case to case. The higher-end pricing usually applies to modified or high-performance engines, so for a passenger car you are likely looking at the lower end of the spectrum.

Can You Drive With A Bad EGR Cooler?

Can I drive with a bad EGR valve? Technically, you can drive your vehicle with a bad EGR valve, but your vehicle will run rough, shake at idle, and a check engine light will be illuminated. You might also hear popping sounds while driving down the road.

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How Do You Know If Your EGR Cooler Is Bad?

There are three (3) major symptoms of a leaking EGR cooler:

  1. White smoke. When the EGR cooler starts to fail, it will drain a lot of coolant out of the EGR cooler into your exhaust system. 
  2. Missing coolant from your D gas/overflow bottle. 
  3. Gooey EGR valve.


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