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I have to do this to mine every year. forced hot water with baseboards and big ole' radiators
there's a pyramid shaped valve thats lets in more water. pump it up to about 15 pounds on the gauge. then run around and bleed all the air out from each baseboard heater. starting with the one closest to the boiler, ending on the top floor farthest from the boiler. then keep adding more water thru the pyramid valve thingy till the system stays at 15 pounds and it's all out of air.
Same thing happens to me the top floor doesn't get heat. usually when I hear the pipes creaking I know it's time to bleed the system again.
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