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should have scooper valves on the highest point of the runs at the furnace. You can manually open the bicycle valves and see if air or water comes out. If you hear something that's air in the lines. Oil guys charge $$$$$$$$ to bleed these and I have found that you can do them easily yourself with the valves if needed. Should be no air in the system unless the scoops are bad or you've done work on the system and not bled it.
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