I have a 2016 Fiesta ST purchased in May, but built in Dec 2015. It has the same issue. Initially it didn't seem to be adjusting properly and would sometimes blow cold air when it shouldn't be. I took it to dealer for service and mentioned the SSM mentioned in this forum. They told me they performed a software update and resolved the issue. Now it does not come on at all unless it is on high or low. I took it back to another dealership. The first told me they were ordering a new hvsc control module. The next day they called back and said Ford cancelled the order. Ford does not yet have a fix, but is working on it. So, I have to go pick up my car without a fix, and no ETA on when the fix is coming. Very annoying, especially since according to this forum the issue has been going on for a year. On another note, when the hell is the Apple CarPlay upgrade coming?