Shut off el. and water to system and open the drain and let air into each radiator, you better have some experience boiler man come over the first time to do it and refill it.
thanks for the reply. Perhaps you’d have input on the rest of my bathroom plumbing.
Since most of the plumbing I’m sure is original…should I remove the floor to replace what’s underneath? I ask because it’s very difficult ot remove the tile/mud. I removed some near the wall because it was crumbling.