I want to change a radiator that is working poorly and has rust. It's not
The radiator is downstairs and I am at odds how to drain the system before
removing the radiator.
I located the warm in and cold out lines and switched them off. I opened and air
valve of another radiator and let it run dry. The amount of water that came out
is in my opinion only what the opened radiator have. Pressure in the whole house
radiator system system went to zero in a minute or so. Shouldn't more water come
out? Why isn't water upstairs radiators gushing down from the opened valve