hi, i have a problem with the cold water flow from the storage tank as its virtually non existant, the problem arose after i drained the system to do some work and when i refilled the system i had air locks in the hot water but the cold was working well with loads of flow so then i removed the air lock from the hot water side by swapping the washing machine connectors over using the mains cold pressue to blow it out, then once everything had settled i opened the cold tap upstairs and there was hardly any flow..!!! please help any ideas welcome