I had this feature on my old 2007 Audi A6, which replaced the moon roof with a solar sun roof, which powered a fresh air fan when parked in the sun. I purchased

I had this feature on my old 2007 Audi A6, which replaced the moon roof with a solar sun roof, which powered a fresh air fan when parked in the sun. I purchased it off-lease, and it was pretty much maxed out on features. I never saw another A6 with the solar option - I think it had to be special ordered from the factory. A shame, it was really handy in the Texas heat. Now I have a tesla which can just run the AC at will, which is even better :)