Sorry I can explain, the truck started getting diesel mixed with the coolant. I researched on here for awhile and asked a few people questions. Got a TON of help. It was suggested that it could be a crack in one or more injector cups, or one or both cracked heads. I unfortunately do not have a great deal of experience with diesels and I don't have a way to pressurize the system. I took it to Ford, talked with the tech for a while and basically he said the same thing, so did engineering. The truck runs great, so he thought it was pretty unlikely it was the injector cups since he though there would be a miss or something. He leaned toward a cracked head, but was gonna be $1000, cause he wanted to cab-off the truck, then put soappy water in the injector cups, drain the coolant, pressurize the system and look for bubbles. If it was injector cups then that was a 1.50/cup, if not it's a head or two and I'm at $1000 and a broken truck, or $4000+ to fix it. So I took my truck, paid for the time and now I'm assuming the worst and tryign to save or sell