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I have a weak baseboard radiator that was untouched for years. It's the last one (I think) in the loop, and also the biggest one. I troubleshot the following:
1. Loose carpeting (hardwoods)
2. Closed air/vent cover (these radiators don't have closing vents)
3. Dirt between metal fins (clean)
4. Closed shut off valve (doesn't seem to have them, just air vents with a flat-head screw)
5. Air trapped in the system (this is probably the culprit - read below)
So i was trying to bleed the radiator in question. Turned thermostat on, verified that the system works, all other radiators are hot, the pump works, all good. Unscrewed the manual vent. Some water poured out, first with a pressure, shot up 6-7" (the hole is upward pointing), also made farting sounds - which I think is the air coming out. Then it slowed down to eventually no water coming out at all! As if the system is completely empty. I thought, ok, maybe give it some time to push the air along, so I closed the screw, came back in 15 minutes, repeated - same thing happened.
Am I doing it right? How can it run out of water when the system is on?