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Banging Steam Supply Pipe
I have a two pipe steam system and every radiator is working fine except the one in the upstairs guest room. It is the second shoot off the furnace. The supply pipe will bang in the floor right below where the pipe comes out of the floor to get to the radiator. The pipe will get warm/hot about 4 inches above the floorboards but steam won't enter the radiator. I took off the return coupler to try and bleed the air through the radiator but that did not work. I also checked the steam valve to make sure it was open and that was working fine too. Any suggestions on how I can get this radiator functioning? Thanks