I have bled all the rads ,but I'm left with two that won't heat up.Both have thermostats .I suspect the valve under the thermostat isn't operating properly ?.I can unscrew the thermostat open or closed and no sign of water,albeit it is flowing through the bleed .Any ideas please?

Dave Thomas, October 2008

thanks very much .It worked!

dave, November 2008

The pins will be stuck on the valves.With a pair of pliers you will have to pull gently on the pin under the valves.That is the problem with t/static valves.

Tony S, October 2008