I just finished doing an egr delete on my 2007. Took my truck out and had no problems with it. Then I head off to work and am pulling a trailer up some pretty steep grades and after a while I stop and have antifreeze under the hood that puked out of the resevoir. Any ideas what the problem would be? I really hope its not head gaskets? truck has never done this before. I filled it up with more cooant and drove another hour and it was good. any ideas?