The front interior windshield fogs in the summer, fall, winter, and spring. The only thing one can do is to turn on the air conditioning. In the winter this solution causes the passenger cabin to become really really cold. In Spring and Fall, the air condition solution doesn't work well either. I'm not sure how the system even worked in the winter as you have to keep the heat on to keep the ice off the external windshield. Not an effective solution. I have had to spend lots of money with interior defogger and deicer every winter. This has been an ongoing issue since I have owned the vehicle. And with the lights, the two main complaints.