If a radiator some distance from boiler, is getting hot, pump working, (otherwise how could hot water get to it) Where is the one that would not bleed fully situated? If higher up,( I do not know the system. If you have tank, check level). The only way one would not fill fully, (unless faulty closed valves, (sealed system, It would get water from both sides.)) is not enough water in the system, Goes for all systems. most not enough pressure, But if you have a header tank, check that, I have known them, to not fill, so your heating does not fill. ALL Depends on location of of bad one, as to problem.
SD
January 2012
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