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Only one home radiator is getting hot but no water or air when bleeding?
I hope I can get some advise on how to proceed. I have a natural gas boiler/furnace with radiation heat and up until 3 days ago when the arctic below zero air moved in the system was keeping my home up to temp but has since been dropping and not maintaining temp in my home, I normally keep my thermostat at 65 but temp has dropped to 53 in the last 4 days or so. Here are the symptoms.
1. The heater cycles off and on without being able to maintain thermostat temp.
2. Only one of my radiators is getting hot and its the one closest to the boiler/furnace.
3. When I went to bleed the radiators I'm not getting any water or air coming out of any of them, even on the radiator that is getting hot (top and bottom of radiator is getting hot).
Is there a process of elimination to determine what may be the cause of the constant cycling and no air or water from bleeding the radiators? Suggestions?