My car over night started blowing warm or uncooled air on left two vents and cold air on right two vents on my 2010 Mazda3.
I always leave the AC on 24/7 when my car is running but for some reason last two days I decided to turn off the AC and forgot to turn it on so after a few days I turn it on and discover this. Maybe it is a coincidence or maybe related that is why I wanted to include it here.