It may be related to the cabin overheat protection (COP) and moisture build up. I've been told this issue doesn't happen when you use COP without the A/C. Circulating cool air through the vents all throughout the day, day after day, adds condensation in the ducting. Cool moist area over time can lead to mold or weird smells. That's why I just have them spray whatever they do in the ducts and change the filter every 6 months. Seems to be a non-issue by doing this.So what is the actual design flaw in this system that requires the A/C to have so much attention?
This is not a new problem why is it that it still has not been corrected?