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I recently repaired a leak on a cast iron radiator. It was venting through the leak and was always the hottest one in the house. I have since replaced the air vent with a danfoss type air valve with an upright vent. I did the same thing in another room in which the radiator was also cranking heat, unregulated, and now both radiators are barely heating up. Air vents out (valves open) but then close while only heating maybe 1/4 of the radiators which then cool off quickly. So now the solution to my overheated rooms is working to the opposite extreme. Not enough air vents out to allow a middle ground of heating each room. both are on the second floor and are fed from the middle of the main from the basement. Also, one of these radiators vents very wet ( the only one in the house) with a very slight hammer and sounds as though there is water in it. Do I just replace the air valves with vents only? that seems the obvious choice but I was hoping to regulate the heat?