Genuine OEM Volkswagen Heater Core, part number 2E0819017D. This vital component is responsible for transferring heat from the engine's coolant to the cabin air, providing warmth for the vehicle's interior. It is positioned within the HVAC housing, typically behind the dashboard. This rectangular, finned heat exchanger weighs 0.524 kg and is constructed from durable metals like aluminum or copper. Using a genuine OEM heater core ensures precise dimensions for proper fitment, optimal heat transfer efficiency, and leak-free operation, critical for maintaining comfortable cabin temperatures and preventing coolant loss.