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Originally Posted by jpilk99
Thanks Oldskewel. I guess my big question, about the "geyser" of coolant coming up/out of the bleed screw: IF I had a warped head or headgasket issue, HOW would that come into effect with the engine not running? There would be no combustion going on?
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Yes. The geyser is just due to not having the bleed screw in. Unrelated to any combustion gases. You need to loosen the bleed screw enough that the o-ring is loose - that will allow gas + a little liquid to come out, letting you know when it is time to tighten it.
The thing related to combustion gases is when I think you mentioned that after the bleed screw is tight, expansion tank cap is on, and you get back from a drive, you notice leaking at the expansion tank cap.
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...but when I opened the hood, I could see a minor leak from what looked like the cap. And I could hear the slight hiss of air escaping ...
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That's what I had - after replacing the radiator + upper/lower radiator hoses, thinking I was in the final bleeding/tuning phase ... and found out I was just getting started.