Maintaining an EGR cooler is not a hard task if you know when it needs your attention. There are certain symptoms that can be observed which will help you repair the EGR cooler or get it replaced. Let us now have a look at the symptoms that might suggest that it is a bad EGR cooler and that it might need a replacement. One can choose EGR coolers from Navistar or Cummins like Navistar maxxforce 9 EGR cooler as they are affordable and of the best quality. The Symptom 1: There can be a loss of coolant from the degas bottle or from the cooling system. The reason for the same can be unexplained and this can only occur when you have a faulty EGR cooler. Experts always suggest users go with reputed ones like Cummins ISX EGR cooler . When there is a leakage in the EGR cooler, the coolant can get leaked into the exhaust system but does not come outside of the engine. A number of people often ignore this kind of a warning sign and this can turn out to be quite expensive...