I have a 2010 Nissan Altima. For the past few months, my defrost has been randomly turning on. This morning when I was driving, I noticed condensation on the passenger side of the windshield and the defrost was on but the defrost button wasn't even lit showing it was on. Also, the last time I drove the car, I had the vent setting on face but when I turned the car on this morning, it was on feet. I have also noticed that as I adjust the temperature in the car, the vent setting adjust based on the temperature. This has never happened before.