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Radiators are cold at the top?

two radiators are cold at the top part upstairs. I have tried bleeding them but no air is coming out. The breather tank has foam coming out of the central heating overflow pipe. What is going on and how do i fix the problem???
Colin Brettell, November 2009
The cold water feed from the expansion tank may be bloked.

Peter, November 2009
is there any water in the header tank , may be that you ball valve as stuck

Brucey, November 2009