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Hi Thank you all for helping Is it better for me to remove the radiator as John suggested, or to add sludge remover to the header tank?? If i do will the loosened sludge damage the pump and 3 port valve? I have never done this before, but am confident of doing it, just need to be...

have tried with lockshield and trv fully open and still the same

1 of my upstairs radiators isn't heating up very well. I believe it has sludge in it as the bottom 1/3 is colder. I have looked in ym header tank in the attic and it looks dirtyish. Do i need to remove this radiator to flush it out or should i clean the whole system out?? I have heard...