I suppose that's possible but I still feel like it's coolant related. Other then that this machine is awesome. I'm thinking also maybe the intake hat that sits on top might be breathing in all this hot air contributing to the over heating. I was thinking about plumbing the intake to some fresh air and seeing what that does. Probably do that tomorrow.Oops. Not sure that diesel suffer from vapor lock like my gas engine Genesis 5.9. Nevermind.