I'd like to add an observation that I am having with my 2020 to this discussion and see if anyone else is experiencing this. I activated my ventilated seats while driving a couple months ago, and I heard audible fan whine, which I expected and believe to be normal. And, I felt some cooling on my back. But, the cooling effect was a little underwhelming. After about 15 minutes of driving, I noticed a distinctly electrical wind up noise repeating itself every 2-3 minutes or so. I thought it was my rear seat entertainment system making noises for a while, although, it did sound distinctly like an electric fan trying to start - I've heard similar noises from PC fans in computers I've built over the years. Anyway, it turned out to be coming from the ventilated seat module beneath my butt. It wasn't turning on, and it sounds exactly like the fans struggling to spin up. But, here's the rub. They always come on consistently when I am either not in the seat or when I shift my weight up from the seat some. When I am fully seated, the module seems to fail to spin up about 30% of the time or so, and it seems to me that the weight of my body is somehow creating too much resistance for the fans. One key take away here is that back of the seat always kicks on and provides some cooling. And, frankly, I would have never noticed the system wasn't working at full capacity if I hadn't heard that electrical whine. But, with the under seat module working, the cooling effect is much better.