I feel that it is heat related because I detected the smell for the first time today. Here in Las Vegas right now the temperature is 107 F. We leave our car in the garage most of the time but today we were out and about and parked the car in the direct sun for a while. Of course it got much hotter than usual in the car and, upon reentering the car, we both noticed what smelled like someone's breath after eating garlic when we didn't have any ourselves. Everybody knows that smell. I have no idea how to solve this.