I moved into my home a few months ago and suspect it's been quite a while since anyone bled the radiators. I've been going around bleeding them for a few days and I'm still getting a lot of air out of some of them and I'm not getting water from any. I'm not even getting water out of the ones that are completely heating up. Should I keep the valve open until water comes out (even if the air has stopped?)
Should I just keep bleeding them until all radiators stop pushing air out? or is there potentially a bigger issue?