Genuine OEM Audi HVAC Blower Motor Control Module, part number 4E0820521C. This module precisely regulates the speed and operation of the vehicle's heating and air conditioning blower motor, ensuring optimal cabin climate control. It is an electronic component, typically featuring a robust metal heatsink for thermal management. Weighing approximately 0.312 kg, this module measures 0.155m in length. Choosing a genuine OEM module ensures correct electrical signals and reliable performance for the HVAC system.