How to bleed air from baseboard water heaters

Check the end elbows of your baseboard radiator. Not all will have bleed nipples. If you have bleed nipples you will see a brass fitting looking a bit like a bolt with a screw in the head. There should also be a small hole visible. Use a screw driver that fit the screw size so you won't round off the slot. Open the screw enough to allow air or water to squirt out. Start nearest the boiler and work your way outward.