Whenever the a/c is running the defrosters stay open and badly fog the windshield on the inside...gm is aware and has fixes that do not work. i have attempted to have the dealer and gm correct it (it appears to be extremely widespread as a problem)...gm responded that the car functions as it was designed. i find it dangerous.
When using the windshield defroster, instead of clearing the condensation, it creates a very thick area of condensation on the inside of the windshield, regardless of temperature setting or fan speed. i have to carry a micro fiber cloth to clear this condensation repeatedly, even while driving.