I am having random heat issues 2010 avenger .. No problems with rad fluid cycle to the main parts . Heater works after I've pushed the car over 3000 rpms . Than I get a wiring almost like a plastic burning smell. Today it happened to be very strong smelling " As the heater finally started to heat the cabin" Keep in mind it was -25C with the windchill being -35C < this problem is more common when it's colder