Genuine OEM Audi Air Conditioning Expansion Valve, part number 8T0816679. This component is integral to the vehicle's air conditioning system, precisely regulating the flow of refrigerant from the high-pressure liquid line to the evaporator. It is typically located within the HVAC housing, near the evaporator core. Constructed from durable materials, this valve measures approximately 0.085m in length and weighs 0.17 kg. Using a genuine OEM expansion valve ensures accurate refrigerant metering and optimal system pressure, which is crucial for the longevity and efficiency of the entire AC system.