I've got a problematic rad,there's a marked difference in temperature between the bottom and the top of the rad,the top being hotter.
I've had the rad off after isolating at the valves,and drained it down.
I then took it outside to flush it through as I thought there might be a load of black shite in the bottom,but that wasn't the case.
I've now turned all the other rads off in the vain hope that this measure might push through what could be an airlock?
That doesn't seemed to have worked either
Any other ideas/tips chaps ?