On a trip, i was driving on a cold, rainy night and the windows began to fog up so i turned on the heat/defroster which caused all the windows to quickly and totally fog over. the right side was spitting water on to the windshield this was so bad that i had to pull over to the side of the road. it took over five minutes for the windows to clear even after i turned on the a/c and was wiping them with a towel. i did a test the next morning when it was not raining but cold and damp. i started the car and turned on the heat/defroster. all the windows and even my glasses fogged over. it was over ten minutes before the windows cleared even with the a/c on and using a towel. i checked on line and found multiple examples of similar situations over several years. e.g. this video shows exactly what happened: https://www.youtube.com/watch?v=sbojehjmcyi&sns=emisl here are other examples: https://www.carcomplaints.com/kia/soul/2015/ac_heater/extreme_humidity_on_windows.shtml https://www.kiasoulforums.com/2-soul-general-discussion-gen-1/73641-inside-windows-fog-up-real-bad.html i live in the desert so rarely run into these conditions but that doesn't lessen the danger. kia dealers seem to avoid saying it is a problem with the car's design but it seems most likely caused by poor drainage and/or poorly designed air flow.