200+ would put you in Western Australia, not WAshington. I'm stumped. Have you checked your water for carbon (head gasket)? Do you have a steel fan? A viscous drive one would be better, but with an electric fan too you should have no problems at all! You don't say what temp your thermo's spozed to open at, the lower probably better, but what happens w/o the thermo in? Use F. degrees not C. because in america we don't know how many C 180 F is. If there are carbon traces in your water you'ld overheat obviously you would have a gasket problem. Have you pressure tested the system? Any drips on the ground?. I'm sure you checked all that, but...
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