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One radiator is not getting hot
One of the radiators in my house is not getting hot.
-- I have a single pipe steam radiator system
-- I recently replaced the steam vent and the valve on the radiator that isn't working
-- The radiator that isn't working is on the first floor, and is the farthest away from the boiler
-- The pipe to the radiator isn't warming up. Could there be a blockage? I tried following the pipes backwards from the radiator to see where they stop heating up. One of the inlet pipes is very hot. It then connects with another inlet pipe at an elbow. This pipe does not get hot. There are two long pipes ahead of this (also connected at elbows), which also don't get hot (as you would expect..). Then finally, there is an elbow and a small pipe that goes up the floor to the radiator
-- The radiator worked ~1 year ago then we had to get the long inlet pipe closest to the radiator fixed because it was had a leak at one of the elbows. It stopped working shortly after that
Any ideas on how I can fix it?