6.7L Diesel
WARNING: This page is about a different car, the 2014 RAM 3500 HD and 2014 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The Exhaust Gas Recirculation cooler is located above the exhaust manifold on the right side of the engine. Using engine coolant, the EGR cooler reduces the temperature of the exhaust gas that is recirculated to the air intake which in turn helps reduce NOx emissions.