If the lower half of the radiator is hot but the top is cool then you would be write in thinking theirs a problem.When this situation occurs it normal means that theirs air trapped in the system.you can use a radiator key to release the trapped air but only start this job if the radiator is cool and the heating is off,you only need to open one end at the top of the radiator and have a rag or dirty cloth to hand as some water may come through the bleed valve.Normally you only need to open the bleed valve one turn to realese the air but youll no when its open enogh as youll be able to hear the air hissing as it escapes.once you start to see some water coming threw the bleed valve you can be sure that all the air has leaked out and you can now close it up,but be carefull not to close it to tightly as you may need to re-bleed it at a later date.
You should go back to the perticular radiator that had the problem arfter a week or so to check if the radiator is displaying any of the same problems it was before.If it is displaying the same problems then its likely that air is entering the system from somewhere.This will not be an easy fix and will most likely require a specialist come access the problem,but before you do rush out and call in some one i suggest trying a sludge removal chemiical as sludge build upo can display the similar symptoms
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