ya replaced radiator 6mo ago.
im 95% sure its not flowing, the lower hose is cold, so its getting hotting and not getting past the thermo. but lie u said could be something else before thermo
the air bubble would have to be bigger than my fist to keep the coolant from heating it up the thermo. and really the air would get pushed thru the little relief hole
when I remove lower hose, small amount of coolant is making it thru the relief hole. just not fully opening.
even when well above 170
some1 said just remove the thermostat, or drill the relief hole way bigger