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Today I went up to my unfinished attic, which is totally sealed off from my home (and freezing!), and noticed that the valve must be open and because the vent is spitting/leaking it's hot. This will be an issue once we have some ice (melting the roof, etc) I assume, not to mention I don't want to be heating the attic!
I can replace the vent but curious if it's okay to just shut it on at the main valve. I have another radiator I've shut off at the valve, due to it being a kid playroom.
If I do shut it off, is there a good or bad time to do that? If I shut it off while the system is on, water will be stuck in the radiator after it condensates - is that a problem? If I shut the system off to shut it off, how long do I need to wait for it to cool. Same question goes for replacing the vent.