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JohnD, thank you. I do have a pump on the system, but it maybe faulty. I'll try your idea of blowing through with cold water.

Hello, I have a 28 year old IDEAL gravity-fed boiler system, which we just had serviced. However, I now have great downstairs heat through the rads but no rads at all working upstairs. I've checked header tank (full) and closed off all downstairs rads, but upstairs barely gets warm. With...