Radiator is cold at the botton Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[I know nothing]

One of the upstairs radiators is cold at the bottom. I have bled the radiator and both in and out pipes are hot... help please!

[plumbbob]

By your description, the radiator is full of sludge which is preventing the hot water from circulating properly. It needs removing and flushing thoroughly with a hosepipe.

[Steve the gas]

Hi,

Cold at bottom indicates a sludged up system. Do you have any chemical in it?
If not, bearing in mind your forum name, I suggest you call a good RGI.
May need a flush out or two + chemical - inhibitor.

Hth