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Hey guys, I am new to the forum. I was at a job today and I've been there before. Its a 3 story house with a single zone hot water heating system for the whole house. The first and second floor gets plenty of heat, but the third floor does not. They have those copper convectors, one in each room. They recently renovated the house and the contractor had taken one of them out and capped the pipes. So I thought maybe that was causing a circulation issue and put in a new convector. It fixed the problem where one of the second floor rooms was not getting any heat. There is no purge station on this boiler, and it has those vents on top of the convectors. I did bleed all the air out of each convector and still no heat. Do you guys think that it could be those valves on the convector themselves or is there some other issue? I am thinking its air trapped somewhere, so I was thinking of putting in a purge station and giving the system a good purge, maybe there sludge or something in the system somewhere. Its a very old boiler. Any comments will be appreciated.