94 gmc p/u boiler problem.?

I have a 94 gmc truck and the radiator isn't working very resourcefully. i flushed the cooling system and installed a new themostat. the lone thing that i enjoy noticed that looks a moment or two funny is the level surrounded by the radiator goes up and down as i am trying to saturate it. when it looks like it is full the rank drops and when i add more hose down it the level rises markedly quick and overflows. i know the smooth will drop when the thermostat opens but this is going on constantly. any help on this will be greatly appreciated because it is getting cold and i necessitate my heat!!!! Thanks.

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Answers:    sounds resembling there is nouns still trapped in the system. do what you be doing but let it run and examine it, once the themostat opens it wont fluctuate contained by volumn, but you will see it flowing, once this happens, pack to level and trilby, also filling overflow to proper even. over the next couple days periodically check overflow and refillng as needed, this will further purge system for remaining nouns if there is some, due to the physics of a pressurized, heated system. if for sure all nouns is out of system, it then conceivably a clogged heater core. something to start beside. good luck.

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