With winter on it's way , it might be a good time to start getting an emergency kit ready for your car . Here is what I use for an emergency heater . Take a large metal coffee can and peel the paper off , use a roll of toilet paper as a wick [ remove inner core ] , soak with rubbing alcohol and light . This will heat an average size car for quite some time . If I am not mistaken ther is no carbon monoxide fumes but I would still crack a window .