Jeepsinker
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Yes it sounds like a cracked head, but it may surprise you. Coolant loss can be a real booger to diagnose properly.
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I would definitely pull them both instead of just one. All the work is getting to that point.A cracked head sounds easy to me at this point. I hope I can identify that without actually pulling them. I doubt that will be the case though. But I cant pull the heads until March, as I need to use the truck regularly still.
Bet you have a cracked water jacket, mine did the same thing.Looks like I am going to be looking for a motor. Pressurizing the coolant with 10lbs overnight yielded no coolant in the combustion chambers. What I did observe, was that it only loses pressure when the engine is hot. Once it cooled off, it stabalized at 5 lbs overnight.
In the morning, I cracked the drain plug and another couple cups of antifreeze came out of my fresh oil change.
I will probably not do anything until spring, and ill drive it in the meantime as is locally. It has to be a cracked block, that is my best guess after running these tests and looking it over.