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Where is it in the system? Beginning, end, above, below?
Might just be imbalanced as @stevo_com suggests. If the flow can't be de-restricted further, you can restrict other rads in the system to force a higher flow rate. There's guides on-line for how to balance.
Howard
NickCJ
Is a central heating Powerflush money well spent? We have one rad that was noticeably cold over winter (despite bleeding) - is it a better idea to get that individual rad cleaned out somehow?