Solved this one myself.
I thought I had already checked the coolant level... I had not. I learned that the coolant travels through the vaporizer and keeps it from freezing up. A low coolant level was causing the engine to run hot and to ultimately freeze up the vaporizer. I'm going to fill it back up and look for the leak.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.