Just successfully drained a radiator to fiz a leaky bleed valve...so far so good on the leak front...but I've just fired the heating back up and the radiator is hot at the top, and cold at the bottom.
How can that be? I've opened the bleed valve and there is water coming out so the rad has water in it to the top...why no heat at the bottom then?
Any ideas?
Sludge in the bottom???
yeah, had a curry last night so that's working it's way out...but what about the rad? 
probably a good guess...was a bit of black with the water at the top...guess I'll have to buy some of that stuff what cleans it!
I wouldn't necessarily worry about it
It's very slowly warmed up now, so I think the sludge is probably the problem...
Thanks for your answers folks.
Have you got thermostatic valves? The rad might have shut off before it had time to fill with hot water if the room isn't too cold.
Or the rads as a system are not balanced quite right so your half warm rad isn't getting its fair share of water and therefore takes longer to heat. Do a little Google on lockshield valves, basically they restrict the water flow through the rads closest to the boiler so there is still enough circulation at the rads at the far end. Don't fiddle with them randomly unless you understand what you've read and think its the problem as you could fubar the whole lot otherwise 
Turn of the rad valves, drain the radiator, remove the radiator, flush out the radiator with a hose pipe in one end occasionally giving the raditor a shake with some water in it, do this until the water is clear then refit.
If you can be bothered to, drain the system and do to all radiators then fill it up and flush out a couple of times and then put some sentinel x100 inhibitor in it.
Time consuming but you should be able to do this easily in a day
Saves costs of a plumber doing it
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