There are many well-intentioned articles on how to bleed your basic hot water radiator heating network.
Most recommend bleeding when system is *relatively* cool(is off or hasn't fired in a while).
Where they differ most is the starting point. Some suggest moving from radiators closest to boiler(1st floor) to the farthest(IE 2nd flr). This site -
Does it matter?
Also, I was told that after a good bleed job none of my radiators should ring like bells when knocked on with my fist. Some of mine do, even though they are evenly heated side-side and top-bottom. Does that indicate trapped air bubbles?
And how do I remedy those?