Genuine OEM Audi HVAC Heater Control Valve, part number 06E819809D. This valve is a key component of the heating, ventilation, and air conditioning (HVAC) system, responsible for regulating the flow of hot engine coolant to the heater core. By controlling this flow, it allows for precise adjustment of the cabin temperature, providing comfort to occupants. As a genuine OEM part, it ensures accurate calibration, durable construction to withstand coolant temperatures and pressures, and seamless integration with the vehicle's climate control system for reliable operation.