Genuine OEM Audi Cabin Air Fan, part number 3QF819021B. This blower motor is a critical component of the vehicle's climate control system, responsible for circulating air through the heating, ventilation, and air conditioning (HVAC) ducts. It is typically located within the main HVAC unit behind the dashboard. Weighing 1.659 kg, this fan is engineered to precise factory specifications, ensuring quiet operation, optimal airflow, and reliable long-term performance, unlike aftermarket alternatives that may cause noise or reduced efficiency.