Greetings. I have a single line steam system and all is good, but one radiator in the bathroom isn't heating up. The intake valve seems to get warm, but no part of the radiator itself heats up. In addition, I hear that loud knocking sound from this radiator when the boiler fires up, which tells me some steam is entering and hitting water, based on what I've read. The valve is in the full open position. I have tried a new vent, and even no vent, just incase air was not escaping. I have added a couple of shims to make sure that the radiator maintains a slight leann and checked with a level. Now, I'm not sure what to do? What's the next step? Thanks!
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