The EGR cooler keeps the temperature of the exhaust gases under control before they reach the EGR. The exhaust gases are then recirculated back into the engine to reduce the temperature of the cylinders. Exhaust gases can reach extremely high temperatures, which gives the EGR cooler great importance.
But how do we know when the EGR cooler needs to be replaced? In this article, we will provide you with some indications:
Engine overheating: The first symptom you will notice when the EGR cooler no longer functions is excessive engine heating. Any blockage of airflow reaching the cooler can overheat the EGR and, consequently, the engine. For example, carbon deposits can accumulate inside the cooler over time, limiting the airflow and preventing the gases from flowing freely. If the gases do not pass through the cooler, they will not cool down, and the engine will begin to overheat significantly.
Exhaust gas leaks: These are a fairly common cause when it comes to affecting the EGR gasket and the cooler. If your car starts to hiss, whistle, or make noises from under the hood, you have exhaust gas leaks. Such leaks will reduce the efficiency of the EGR and may affect the engine’s performance.
Increased carbon emissions: EGR problems lead to increased emissions. Be careful not to take your car for an emissions test when you suspect EGR issues, or you may need to make another trip after repairing the car.
Check Engine light comes on: When you have EGR problems, be aware that the Check Engine light on the dashboard will surely illuminate. If the car’s computer detects a lower flow of gases passing through the EGR or an overall higher temperature, it will illuminate the warning light to alert you to the problem. We assume you already know that any engine problem triggers the Check Engine light, so when it lights up, connect a diagnostic tool and make sure the EGR is the cause of the problem.
Not all cars come with an EGR cooler, but those that come equipped with one from the factory should know that they require special attention.
So, if you have reason to believe that the EGR cooler has problems, you have three options: dismantle and clean the cooler and EGR at home, replace it entirely, or take it to a mechanic to diagnose and resolve the issue.
