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Message: <blockquote data-quote="MalcolmV8" data-source="post: 134023" data-attributes="member: 24693">As far as I can tell that nipple sealed good.  There's no signs of leakage or mess around it and I lightly pressurized it with my mouth and hose prior to putting into service and it seemed fine.  One day I'll tear out the radiator and get it welded properly.  I was about too till I realized it looked like a heck of a job trying to figure out how to get it out and went this route to see if I could get things running.You are right though if that nipple was leaking it would not suck fluid back when it cooled.  When it got hot though it would push fluid out and make a mess.  I get nothing.  No fluid anywhere in that area.Exhaust is clean, no smells and no traces of white / coolant in pipe either.I sure hope head is good, it was sold to me as a good running unit but first usage had the temp gauge way over towards hot after about 30 minutes.  I shut it off and could hear the coolant boiling in the pipes.  It sounded like a kettle boiling.  I let it sit a couple hours and cool all the way down and opened up the radiator and it was empty.  Filled with water and fired up and and confirmed everything still worked and it was holding temp.  Just not always holding fluid. I imagine this has been an on going issue which is probably why it eventually runs so low it over heats.I agree, pressure test and see if that reveals anything.</blockquote>