That helps thanks.
I've already been lookin at some of the bulitproofs videos.
In your opinion. If the head gaskets were leaking wouldn't you expect the coolant to keep dropping over time(Once mine puked out a few times its stayed at the same level for a while)? Also my cooling system stays pressurized while it sits for a reasonable time. Like its stayed pressurized for 24 hrs at time without being run. If the hg's were leaking it'd loose pressure into the motor which would leak out the ccv breather if I'm not mistaken???????
Your though process is well founded, and makes sense. Too bad these diesel engines are not that scientific. Staying pressurized for 24 hours would be due to a source other than heat. So if the EGR cooler is cooking that coolant, once the coolant cools off, the pressure should subside. If you're hold 14 psi for 24 hours, that would actually lead me to think more about the HG's, but even still, 14 psi is 14 psi, and whether it's heat of exhaust gas, once the cooling system cools, that heat pressure should go away. The coolant cap has already burped off any excess before you shut the truck off, and the remaining pressure should subside and the heat does.
Leaks in the system are small, and can seal themselves back up once metal cools off, and things start to contract again. The leak in my EGR cooler was only evident by moisture when I took it out. I could find no holes. So a hole that small cannot release enough coolant to relieve pressure to a 5 - 6 gallon cooling system. Additionally, if it was leaking into the cylinder overnight, you would have a hydro-locked engine that would not turn over, and if it did you would bend your valves or something else catastrophic.
My blocked oil cooler caused the EGR cooler to boil off coolant, and as long as there was coolant it would boil it off. It did not drop the system to a point and stop puking. Once the EGR cooler cracked it blew steam into the exhaust, and leaked into the up pipe at night, so I was always losing coolant and had to keep an eye out to not let it get too low. Once it leaked into the exhaust, in the mornings my exhaust was a total steam pipe.
I could see where a HG leak might push some out until it was low enough, and when the system burped off pressure, it was just gas. But this is no science on my part.
He may not be the powerstroke expert he claims to be, but the guy at POWERSTROKEHELP.COM
has a good testing kit and procedure to do the necessary test. He ships it anywhere you want, and has a video to show you how it works. I would check that out. (FYI I think his "Engine damage avoidance system" is flawed, I would not buy it.)
Bottom line, you have a blocked oil cooler. That's bad news for the truck. Get that MF'r out of there, the sooner the better...