My GS450h behaves differently from any Lexus I have owned or driven. When I set the A/C system to the "Auto" setting (for recirc/fresh air), the setting will not hold when I turn off the car. Instead, it starts in either fresh or recirc mode, depending on what was actually engaged at the time the car was turned off. If I turn off the A/C system with the motor running, the Auto setting will hold when I turn the A/C back on. I have been unable to duplicate this problem in any other Lexus, but I have not tried it on any other GS model. I have been told that this is typical of GS with navigation, but frankly, I don't buy it. Has anyone else experienced this problem? If you have a GS with nav, would you please see if your vehicle behaves this way? I think Lexus owes me a new control unit, but I need evidence! Thanks.