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Re: Heat Gauge
Yeah you got it right. Well if there is no boiling, which you would see very soon if it is to happen, it is no big deal running it like that for a while...lets say, until the problem you want to correct is cleared. Contrary to popular legend, pressure in the system has no effect on proper cooling and heat exchange. It just allows to run the engine warmer (which improves combustion qualities) without boiling.
I really think 3 or 4 cycles (warming and cooling cycles) should clear any trapped air. If gargles in the heating circuit (well I think you did not mention any of this..but trapped air or exhaust lend to this) or other symptoms persist, then I would investigate for blown head gasket....and this generally leads to true overheating as another cue.
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