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Radiator Rattling Sound

Hi all,

I live in an apartment building in NYC (I'd have to guess it's from roughly 1910-20) with steam radiator heating throughout. One of my radiators has developed a strange noise, though, and my landlords don't seem to understand the issue. It's not your typical clanging, but is more of a metallic rattling. I can't tell if it's originating from the radiator, the pipe, or the connection between the two. To provide as much info as possible, I should add that I keep this radiator FULLY closed and have not opened it at all this heating season. And yes, it's pitched properly. I'd appreciate any help or insight into what might be causing this, because the maintenance guys just bleed the radiators and replace the air valves if they get called in and I'm not sure that's the issue here.

I've included a link short audio recording below. Thank you!