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how to fix an air lock in a heating system??

i took off two radiators in my house and had to drain out the system.when i connected them up again and turned the supply on again the radiators were not filling up.i tried to bleed the top of the radiators but no joy.but the radiator nearest the boiler got hot only at the bottom but no water came out the top.i think it is an air lock but any suggestions would be very grateful?
Francisco Po, March 2009