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I have a double radiator in our conservatory, where the top on one side gets hot, but not at the bottom. The other side doesn't get hot at all. The 'in' pipe is very hot, but the 'out' pipe is cold. I have tried bleeding it and it appears to be full of water. Does anyone have any idea what is...

If it is sludge, would you suggest a 'sludge removal liquid'. What are the pro's and cons of using this?

Thanks for your reply. I've had a look at the little tank, and it is full, but the water looks very stagnent. Any help/ideas, plus how to fix the problem would be most appreciated.

no, but I left them for 2 hours without the stopper in. It hissed for the first 5 seconds, then nothing - the hot water did not seem to be rising inside. Any ideas? Cheers Chard

I have 2 radiators in the upstairs bathrooms of my house which run in conjunction with the hot water, but not the central heating. Both of them now only get warm at the bottom couple of inches. I have tried bleeding them, but nothing has changed. In addition I have the same problem with one...