Hi, I just bought a Cape Cod and the second floor is freezing at night.
It seems the radiators don't get as hot as they do downstairs. It's hot
water heat, could this be an issue of the radiators needing to be bled?
I can't figure out how to do it. I turned the knobs pictured below and
nothing happened. Do these type of radiators get bled from the
basement?


http://img85.imageshack.us/img85/9620/dscf0640fy6.jpg

http://img152.imageshack.us/img152/6781/dscf0641qk1.jpg