Audi A4/S4, Volkswagen Passat Blower Motor 8D1820021

The OEM Blower Motor, part number 8D1820021, is a critical component located within the heating and air conditioning system of various Audi and Volkswagen models. Primarily found in the passenger compartment, it is responsible for circulating air through the HVAC system, ensuring cabin comfort by regulating temperature. This motor interfaces with the electronic AC control and may resolve issues such as insufficient airflow, unusual noises, or complete failure of the ventilation system. Compatible vehicles include the 1997-2005 Audi A4 and A4 Quattro, and 1998-2005 Volkswagen Passat, covering a range of engine types—1.8L L4, 2.8L V6, and 4.0L W8. Other related part numbers include 8D1820021B and 8D1820021C.