Yesterday had heater on full short two mile drive and got a very strong smell of popcorn? Tonight after 20 mile trip car had hot smell but could not find anything over heated? What should I be looking for?
Oil leak possibly. Even a minor leak will seap onto the header, and emit an odor. Its not serious, but when you turn the heat on, it will draw that scent directly into the cabin.
Usually caused by old front seals or valve cover gaskets.