Need a some advise on bleeding a radiator. In my flat I drained and removed a radiator to get it repainted. I've refitted it and can't get any air out of it. It's a combi boiler system feeding 6 radiators. After I reconnected the valves and opened them I could hear the water flowing for a few seconds then it stopped. I did this with the bleed nipple removed but no air came out. The boiler showed a drop in pressure so re charged that and tried running the system. Everything else heating up ok but still no air coming out. Is there a method of getting it bled or do I need assistance.
Alan
Alan