PTC heater short circuited, overheated and scorched/melted itself as well as other plastic Hvac components and sent toxic fumes into the passenger compartment via the HVAC vents. This truck has been in 2 different Dodge dealer service departments multiple times for the same failures. After repairs were performed, the same failures occurred on the way home from the dealer. The PTC heater grid sits INSIDE of the HVAC airway. I am now experiencing multiple adverse medical symptoms from these exposures.