Yet another, cm2350 overheating

[Vengeance]

Well I promised I would give an update when I finally figured out the problem. In the end it was the radiator that was causing the engine to overheat. Several months before I had been to a gypsum/concrete plant on an extremely dry and windy day and that stuff was blowing everywhere. Just as I was leaving it started to rain, and the dust that had built up in the radiator got wet and solidified in the radiator fins. I couldn't see it until I got right down to the radiator. It was like, well, cement, couldn't even really scrape it out wet or dry, without using too much force and doing more damage than good. Which explains why pressure washing from the back of the radiator did no good when I tried. Even so, when removing the radiator the small plastic tube to the coolant reservoir broke, so $500 for a new radiator from Amazon and problem solved. With a few more experiences since then I have learned the most obvious cause to a problem is usually the solution, save the cummins troubleshooting guides for when the obvious proves not to be the problem.

Thanks Rawze and others for your guidance, sometimes it's nice to just have another brain to pick when something isn't clicking.