I went to bleed a radiator today and although a little bit of air came out, it stopped and no water came out even though the heat is on.
I went to the boiler and the pressure was only 8 PSI.
There is a valve near the expansion tank that seems to be where cold water can enter the system. I tried opening this valve and the pressure slowly rose to about 12 PSI. (feel like I am operating a submarine here) Should I continue and let more air into the system until it is a higher pressure?
Shouldn't the system automatically be drawing in water if it needs it?