I'm used to a very noticeable change in air flow sound when hitting the recirc button on any car (especially with the fan turned all the way up). With the Roadster, I hear no change, and the behavior of the heat doesn't seem to change. And given that it resets to off when I stop/start the car, I'm wondering how it's engineered or if I perhaps have a problem that I should have looked at while my car's in NY next week. Can other owners comment on the behavior of their recirc button (changes in sound, resetting after turning the car off)? Thanks!