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In short I have what appears to be an old 2 pipe steam system that was converted to hot water using the original radiators from when the home was constructed in 1925. My issue is that while generally the system works very well, the back bedroom radiator never seemed to work, I recently had to move a radiator in another room so I later took the time to bleed the entire system, including the cold back bedroom unit, but still no heat.
The unit did fill with water and I've checked a few times that there is no air in the system but it always stays cold. Could there be some kind of loop where hot water isn't circulating to it, but it is still filling with water? What should I be looking for in order to identify and correct the issue?
Thanks in advance.