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I thought the roblem with my radiator was rapped air, but after bleeding it I've foud it's still completely cold. However after some googling I'm now thinking it is the TRV perhaps? The image below is a bit blurry, but is tha little nob in the centre what's causing the problem? Has it got stuck...

Can anyone tell me, from looking at the attached pics - is my bleeding valve the thing at the top of my radiator (2nd pic) or the square shaped hole at the upper right hand side? (3rd pic)