I've been having a faint gasoline smell when I first turn my ac or heater on when I first start my 2006 Hyundai Accent. Then earlier today I noticed a faint burning rubber smell from the heater and the minute I turned it off, I didn't smell It anymore. Once I turned my car off and got out, I smelt the faint burning rubber smell again coming from the hood. I'm scared to drive my car, what could it be ?