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Why EGR Coolant Leak and How to Fix That?

1.What is EGR cooler and how a bad EGR cooler can impact your car ?

EGR (Exhaust Gas Recirculation) systems are designed to recirculate a portion of the exhaust gases back through the engine primarily to reduce NOx (Nitrogen Oxides which are bad for the environment). The EGR cooler is the portion of this system used to reduce the temperature of the exhaust gas before being recirculated into the engine intake air.

The results of this failure can damage a number of different EGR system components, including the VGT turbo. Most failures happen inside the EGR cooler, so it's easy to miss until symptoms start to show up elsewhere.

 2.Why EGR cooler failed?

An EGR cooler primarily fails by cracking internally. There are no moving parts in an EGR Cooler. An EGR cooler is simply a heat exchanger which exchanges heat from the exhaust air to the engine coolant. One portion of the EGR cooler has exhaust gases flowing through it (latest designs use tubes) while the other portion of the EGR cooler is flooded with engine coolant. After many cycles of heating up and cooling down, the thermal expansion/contraction causes the materials inside the EGR cooler to fatigue and fracture. When this happens, engine coolant mixes with the exhaust stream.


3.How to fix an EGR cooler leak?

  • Install a new clamp and lock it to tight at the leaking part. Choose the same size of butt joint band clamps as diameter of pipe.

  • Fix the leak with an EGR coolant repair kit, it only takes a few hours to finish the job and you could find installation video on Youtube.

  • Remove the EGR system. It can completely solve the problem of EGR leakage and optimize the horsepower of the car. You could purchase the suitable kit according to your car model. An EGR delete removes the possibility of such damage, thereby saving your money in the same time.


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