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And thank you Mogman!

I am going to run it gingerly this weekend. There's so much flow in the reservoir, I can't tell anymore. Like a squirting hose in there. That's new too. I've warmed it up and cooled it off a couple times and fluid level has gone down a little, just not back to normal. Seems like I have to...

I've pretty much gotten past the denial stage, wishing it might be some easy cheap fix and not a head gasket. There's just nothing else that would produce these symptoms that I know of. Now it's yarding out the mill and replacing. You (Mogman) referred to the GEP motor in post #13. This has...

Thank you Sigi for the info, that's a great idea.

That's good advice, thank you.

Thank you eaw46! I'll follow up today. Called quite a few Diesel shops and they don't want to work on the 6.2/6.5s any longer. They say quality parts are getting hard to come by and it makes it hard to back their warranty.

whole story: short trip, after which coolant reservoir is now showing completely full. I let it cool completely. opened reservoir and started motor, constant stream of bubbles in the coolant res. Capped res. and let heat up. Once hot, intermittently pushing out small amounts of coolant...

Thank you, Tobash. I did think about that also. I was hoping for a guy that was familiar with the HMMWV, but I guess there's nothing magical. I've been told that the motor/trans has to come out to do this right, is that your experience as well? I have a lot to learn.

Thank you, sir. I sure hope so.

Pretty sure I've got a blown head gasket in my 2008 M1123 6.5 NA. Not sure I want to tackle an engine teardown right now with the work schedule so hectic. Does anybody know a good HMMWV mechanic near Phoenix AZ? Any help would be greatly appreciated. My apologies if I posted in the wrong...