We moved to Minnesota from Texas this last year and never really had an issue with the window fogging before. But once the winter came, we noticed it right away on a road trip to Wisconsin. Check the boards here to troubleshoot the issue and discovered it was a broken HVAC recirculate door. problem is, I have no idea when it happened. Dealer here says their system doesn't tie into the service history of the Texas dealerships and even if it did, the car is out of warranty. How much does it cost to fix this? Is there a DIY fix?