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If you want to drive with the top down and the a/c off, turn the a/c way down and then turn it off. See if that doesn't help. There is a C-best setting to turn that "feature" off but I don't know if that really helps. Other thing to try is to make sure that the a/c is on recirculate. (If it is already on recirculate, try switching it over to fresh air.)
Toyota and Lexus Join Mille Miglia For The First Time
Slideshow: A five-car lineup spanning more than five decades of Toyota performance and engineering will tackle one of Italy's most celebrated automotive routes.