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Message: [QUOTE="rcdan0108, post: 1562700, member: 37363"] I know there are tons of old threads on this and the common answer is straight to heads for puking degas bottle. Been a heavy equipment for 20 years and this has me stumped. I think it is heads so lets get that out of the way. However, im 2nd guessing myself so im looking for someone with specific knowledge to the engines not just screaming heads heads heads. Not trying to be a dick about it either just asking for outside the box thinking. With that being said I will explain. 08 6.4, 180k h&s, egr/dpf deleted, mild tune. Doesn't run hot, truck runs really strong, no coolant consumption, eot/ect within 2 degrees of each other. Only symptom, pukes from degas at 25-40psi boost. Sooo after 5 caps I pressure tested degas, 22 psi. Ok so swallow my pride and lets make a parts list but wait there's more. Here's what is really confusing, I've now performed probably about 10 combustion gas leak test with 2 different kits and chemicals, all passed?! Even after several of those doing WOT runs over and over. 1 more stumper that I know can cause higher coolant pressure but you usually get overheat with it. Upper rad infrared temp 170 ish lower 70 degrees after an 86 mile drive with 65 degree ambient Temps. Again im not saying it's not HG's I'm trying to make sure I'm not about to dump 5k and a couple days of work into this and it be something as dumb as clogged rad or tstats. Side note I just discovered low temp on lower hose tonight and no I havent dumped coolant yet. Rad is only 2 years old. Tstats are easy just figured I would see overheat with one of those 2 being an issue. Any thoughts would be greatly appreciated. [/QUOTE]

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