I have a 98 Z3 that my wife and I have been leaving here and there in storage between trips. Last time we used it the air conditioner button wouldn't engage except for when the ignition was on the motor was off. So long as we would pull over and turn off the car and try again it would work just fine, but if we turned it off while driving, we would have to repeate the stop and restart procedure if we wanted it on again. Prior to this last trip everything was fine. Any thoughts about what's going on? We won't have a chance to travel with it until October, but we have it in Florida and will need the air. Thanks for any help.