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I have an 04 Ford F-250 6.0 and I just had the motor redone from a blown head gasket got fire ringed heads new headgaskets arp headstuds and egr delete and I’m still leaking some antifreeze out of my degas bottle need help only have the truck back for two months (also have a sct tuner with innovative diesel tunes)
Plumb in a pressure gauge and see if it's building pressure. This test is well documented here and youtube. The reservoir should be in the lower half.
After the engine is warmed up, open the cap and vent any pressure then tighten the cap again. Go for a drive at WOT and see if the gauge spikes up to 15 or so. If it is rapidly then you have a combustion leak into the coolant system. If you're EGR cooler deleted then I'd suspect head gaskets as long as the coolant isn't contaminated with fuel or oil.