as per previous, bleed them but make sure that they are all balanced correctly. If unbalanced water will just take the path of least resisitance. There should be 2 different valves on them, one is open/close , the other does the balancing. Make sure all open/close are fully open and set all balancing to 50% open (by popping off head and counting number of turns from shut to open). Then turn upstairs and near boiler down so as to restrict flow. Keep balancing (or fiddling) until all radiators reach similar temps)
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