my rads are hot at top and cold at bottom how can i fix them ?

my rads off Halstead Ace High boiler are hot at top and cold at bottom how can I fix them ?
PETE, January 2013


done
The rads will have a build up of sludge in the bottom of them. You can isolate the offending ones remove and flush through outside with a hose. When re-filling the system use a protector to help stop it re-occurring.

Paul, January 2013
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