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I dont think its a blockage. If its an airlock how do I get rid of it? There is very little air coming out of the blead valves on the radiators.

Hi all I 've had to replace a radiator down stairs, this meant draining the system. When i tried to refill the header tank filled up but the water goes nowhere. The system is a traditional back boiler with header tank, pump (in the airing cupboard) and hot water tank. Any help would be...