From what I have read....If your fan is on the off position after you start your truck and when you depress the fan speed button and that turns on you AC automatically even though it does not display below the temp display. You must then hit the AC off button to shut it off. If you turn your truck off with the AC off displayed then it will start with the AC in the OFF displayed. Long story short...does that mean I have been driving with my AC pump running all this time ??? and MPG may have been compromised.