RAD HOT AT TOP, BOTTOM ITS NOT

[khushdy]

All

I have a couple of radiators that are fairly hot at the top but are warm/cold in the middle and bottom. Please could someone advise on what the problem could be and how it can be resolved.

I have tried shutting off the rad , bleeding it and then opening it but water comes out and does not seem to make much of a difference unless i have to do it a few times i dont know. There is no air trapped in the rad as water comes out everytime i bleed them.
Any suggestions??

 

[chrishutt]

Is the return pipe hot? If so the problem will be sludge blocking bottom channel of rad. If not, it's just poor circulation which can have various causes (do a search). Check circulation by turning off other rads that are working - this should improve flow through rads in question.

 

[ivor7]

if rads are hot at top but cold at bottom turn locksheild valves completely off and turn back on half a turn turn. what is happening is water is going in and straight out again without heating all rad up so closing return down restricts it going out and balances rad