Cold radiator

[baumatic]

I have 2 radiators, one in the en-suite shower room and one in the bedroom. The en-suite shower room rad is warm and heating up ok. But the one in the bedroom is cold. When the central heating kick in it warms up then gets cold. Have bleed the rad in the bedroom, still no joy (Also trying to bleed the problem rad in the bedroom I have worn away the bleeder tap, can this be replace or do I need a new rad?)noticed that the inlet pipe is hot but the outlet pipe is cold. Any ideas? Many Thanks

 

[kevplumb]

thermostatic valves ?

 

[baumatic]

Thanks for that, will try (Does it make a differance that I have got the cheap manual ones on all rads ( only setting are 0 through to 5)