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Found the "T", did this, problem sorted. It was indeed due to a lack of pressure in the system. I've now managed to successfully bleed the radiator. Many thanks to all who replied, this has saved me a massive amount of time, hassle and (potentially) money, and I've learned a couple of things...

I wondered about this - it was one reason why I posted here, as I didn't see it mentioned in any of the guides to bleeding that I found. The pressure guage is really low, close to zero. I haven't been topping up the system because I'm not sure how.

Sorry - that post appeared whilst I was replying to another one, so I only just saw it a minute ago. There is a safety pipe, yes.

We don't have a loft, so no feed tank. I can actually see where the pipe runs across from one of the two second-floor radiators to the other, and there doesn't seem to be anything else connected. There is a pipe that goes down out of the boiler and out through the exterior wall.

No, there's only one other radiator on the second floor and we don't have a key for it (we have about four different types of radiator here and didn't get given keys for any of them when we moved in). The other second-floor radiator generally seems okay though - maybe not quite as hot as the...

Thanks - I've tried that, still no water. I've tried bleeding a couple of other radiators, no problems there, so the fault definitely seems to be in this one. I should also note that the problem seems quite extreme - the entire top half of the radiator is cold, it's only the bottom that heats...

Hi, We've finally got around to bleeding a radiator which has been cold at the top and warm at the bottom since we moved into our house 18 months ago... previous owner didn't leave any keys and we've only just got hold of one. When I bled it I got the expected hissing sound for about 10-15...