Caused by Water, Cleaners and/or Soap Contaminants in Air Handling System. Caused by Water, Cleaners and/or Soap Contaminants in Air Handling System Products Affected All products equipped with EGR Cooling System, specifically seen on X12 and X15. Symptom Internal Coolant Loss that leads to EGR Cooler Failure Root Cause Water, cleaners, and/or soap are entering … Continue reading EGR Cooler Corrosion