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I just moved to a new house and the CH system is a mess. Two of the radiators are not working, I have looked at the system pipework and the two radiators are connected via what it looks like a vent on the 22mm CH pipework, facing upwards. Can somebody tell me if the stated could be the reason...

I need to replace a radiator with a new one. I need to modiffy the pipework to fit the new rad. Can I do this by blocking the header tank outlet and return vent (siphon). Will this prevent the need to drain the system? I have an old system and takes ages to balance it if drained!