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I’m looking for information of how to get a rusted bleed valve to turn on my cast ray radiator. The radiator only gets hot on the left side so I googled and the story I saw the most was to bleed the radiator. However as you can see I can’t turn the screw with the flathead screwdriver. I even tried heating up the screw with and torch, wd40 and vice grips. I can’t find a lot of material on these type of radiators. Maybe someone here can help.