My radiator won't turn on.
There are two essentially identical radiators in my apartment. One is working fine. The other won't turn on. The control for the radiator is a simple knob with 6 settings: off and 1-5. Regardless of the setting the radiator stays stone cold and there is no sound of steam. Apart from the control I have access to exactly one thing in the radiator, which you can see in this gallery
I can turn the blue plastic tube, albeit with some difficulty. I have not tried more than a half turn or so in either direction. The white end piece, which connects by a bare metal wire to the control, is removable, as seen in the second picture. So, that's what I've got. How can I make this puppy go?
(Since this is an apartment I have no control over the boiler, but since my other radiator works I don't think the problem is with the boiler anyway.
I put in a maintenance request earlier today, but they never responded, and it's starting to get very cold in here (~60 degrees) even with the other radiator going full tilt, so I'd very much like to get this one going.)