I've owned a 2012 Volt for a few years, and it's starting to get up there in milage (purchased it with only 13,000 miles on it). I noticed today that in the comfort mode for AC, the selected temperature wasn't there, but it just showed LOW. I have no idea what that means, and can't find anything about it in the manual. It's making me wonder if there's something wrong with the climate control coolant system or if the freon needs to be recharged or something. Anyone else come across this? What does it mean? Do I need to get a repair scheduled?