Cringe I haven’t bled the lines in my base board heat for years because for one I didn’t know I had to and second I can’t tell where. Is there an on line manual or diagram I can reference? I checked the heaters in each room. I can only find the pipes coming in and out, nothing that I could push to bleed them. The pipes, from what I can tell just go back the unit. Where on earth do I bleed these lines from????? To make matters worse I cannot find a plumber or heating tech in my area that will service my heat. I’ve called almost everyone in the phone book.