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Thanks again.

Thanks again. I will try shutting off the other radiators and see if the blockage can be forced out. I was confused earlier, saw a few post which ask to turn off system. That was probably due to bleeding the complete system.

Follow Up. should the boiler be off when I shut down the other rads?

I have hot water heat; 9 radiators in a one story house. The house is 70 years plus, we've lived there for 26. 8 radiators are working fine, very hot. 1 is cold. It doesn't have a TRV, just a normal valve. There wasn't any air trapped, you get a steady stream of water when I bled it. There...