Genuine OEM Volkswagen Interior Heater Core, part number 8D1819030B. This component is crucial for the vehicle's heating system, transferring heat from the engine coolant to the cabin air to provide warmth. It is located within the HVAC assembly behind the dashboard. Weighing 1.458 kg and measuring 0.31m in length, this core is built to factory specifications. Choosing a genuine OEM heater core ensures correct dimensions, proper heat exchange efficiency, and leak-free operation, preventing costly coolant leaks and maintaining cabin comfort.