Egr cooler leaking externally?

[Nilao]

Yes sir. Had I not pressurized the system with the egr cooler off I would still be chasing my tail. I would never believe that the casting itself had a hole in it. That thing is a quarter of an inch thick in most areas and about an eighth in others. With the egr cooler on I could not see the joint at the top of the plate so assumed it was the gasket leaking. I got out my dremel out with a fine point bit and ground all the corrosion out and found it to be all the way though and once I wire wheeled the area I found an inch long crack in the casting as well in the same spot. That was the deciding factor to order a replacement. I had to settle for used as there are none to be had new.