I have noticed this as well. 90 degrees outside and the display says that it’s 72 and the auto climate control won’t give me cold air. Then out of nowhere the outside temp jumps up and the climate control works fine. The issue is clearly software relatedI have noticed lack of AC when the ext temperature reading is incorrect. One time it was extremely hot outside but the ext temp indicated 66 degrees. I had the hvac on auto and even on the coolest setting, there would not be cold air. Air was always warm.
Once the infotainment showed the actual ext temp, the ac kicked on