We have a radiator in the bathroom that has an integral towel rail. It is getting hot at the bottom, but is cold at the top. It obviously needs bleeding. There is not a valve at the top that you can open with a key to let the air out. How else are you supposed to get the air out or sort the system out so that the radiator gets hot?
ive never came across a radiator that hasn't got a bleed valve so have another look, they're often hidden at the back of the radiator.
saying that a lot of the modern radiators come with a bleed valve that the installer has to screw in and i guess it is possible (but unlikely) that he used a blank plug rather than the bleed valve one.
Doh! It was there all the time. It's very small and wasn't obvious against the chrome, in dim light etc. Radiator is now getting bleeding hot! Thanks for your help guys.