I live in an old building in NYC, and the heat is turned on all the way, making my apartment boiling hot. I've opened all the windows and it is still unbearable. I want to turn off or turn down my radiator, even though my landlord told me it is not possible. (He said no one in the building can, but I don't believe him.) The radiator is hissing all the time and I can hear it in the hallway before I even open the door to my apartment. Yet when I walk by other people's apartment, I don't hear anything. I figure they must've figured out how to turn it off??
This is what the bottom right of my radiator looks like. In the top of the photo, it shows a metal grate that blocks me from accessing the rest of the radiator. If I turn the valve that I've shined the light on, will it turn off my radiator? It is very old and rusted, and I've already tried to do it with a wrench but it is barely moving. However, I don't want to waste my time and energy if this won't do anything. Please help.
Also, if this is the valve I need to turn, is it safe to put WD40 on it to loosen it??
Any advice will be appreciated. Thank you!