I think it’s a small problem but I’ve never had it before. It’s an old radiator and the air valve won’t screw in at all. Nothing wrong with the valve. I’m assuming the thread is shot. What can be done ...

Marshall Cox didn’t set out to save the city millions of dollars in fuel costs—the inspiration for his radiator-modifying invention was much simpler than that. “I lived in a horribly overheated steam ...