Genuine OEM Volkswagen HVAC Heater Core, part number 5C0819031. This core heats the air for the vehicle's climate control system, providing warmth to the cabin. It is a key component within the heating and air conditioning assembly. Constructed from durable metals with numerous fins for efficient heat transfer, this core weighs approximately 1.481 kg. Opting for a genuine OEM heater core ensures precise dimensions for proper fitment, optimal heat exchange efficiency, and resistance to corrosion and pressure, preventing leaks and maintaining consistent cabin temperature.