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Thanks namsag, I was taught to bleed with the heating on so the water pumps round, I have bled the rads and no overflow from the expansion tank. i have put the heating back on and waiting to see what happends. :roll: :roll: :) :) :)

Hi can any one shed light on my problem, I have replaced 8 of the 11 radiators in my victorian house ready for a new boiler next year (boiler working fine at the moment but old) I have bled the radiators and all was fine for couple of weeks the I noticed a some of the upstaires rads are cold...