heat comes into my radiator but very slowly, the other radiators get hot in the house before this one does, i took the value off to purge it, i don’t even get any cold air or pressure streaming out. any suggestions
The air leaving would move so slowly that you would not notice it and it would not be cold air but room temperature or higher air. You might need a new or larger main vent downstairs on the main pipe leading to your radiator.