I too (like other posts here) was not certain if the ventilated seats worked or not, I asked the dealer to check out, they said the door control modules were defective. Replaced the modules in each front door (they said to replace in pairs as there was an upgrade) and now they do work. The easiest way to tell if they work or not is to turn on the key (but don't start the car) turn off radio so it is quiet, then turn on the seat ventilator. You can hear it come on, it is quite obvious the fans are running when nothing else is on you can hear them plainly. Upgraded modules were part number 220-821-93-51-7C45 and 220-821-98-51-7C45. Even though I am now certain that they work, the cooling effect isn't real noticeable. The one time I noticed the cooling most was when using the "summer opening" feature that turns them on before getting into the car, that I seemed to notice, sitting down in a "pre-cooled" seat was noticeable. Hope this helps someone! This is my first post.