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Heat stops in basement supply line
New to this forum, I have hot water heat, in an old 1890s house. In the basement, one of the supply lines for the radiators is ice cold. You can actually put your hand on the pipe and feel where it goes from hot to ice cold within about a foot. Does this mean there’s some kind of blockage in the pipe? I’ve also heard it could be air trapped in the system? There are no air relief valves on any of the supply lines in the basement. I’ve also bled all of the radiators, and haven’t found any air in the radiators .. thanks