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Hi, my son's radiator seems to be only partially full of water and therefore doesn't heat up properly. I have used a radiator key to air the radiator and although some air comes out, the water never comes out when all of the air is released. Also, the radiator makes a lot of clunking noises...

Hi The radiator in my son's bedroom starts making loud knocking noises approx. 1 hour after the central heating has been turned on. We have to turn the upstairs thermostat down to cut off the supply for it to stop. The radiator sounds as though it is only partially full of water as you...