Audi A4 B8 A5 8T Footwell Vent Air Duct Ducting Channel Rear Left N/S 8K0819503

Audi A4 B8 A5 8T Footwell Vent Air Duct Ducting Channel Rear Left N/S is an original ventilation system component designed for the rear cabin area, on the left side. It is responsible for precisely directing the airflow into the rear passenger footwell area, which improves thermal comfort and the stability of the entire ventilation system. Thanks to its factory geometry and fitment to the center tunnel structure, it ensures proper air circulation without the need for any modifications.

Specifications and technical data

• SKU: 8K0819503
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0819503
• Substitutable numbers: 8K0819503, 8K0 819 503, 8K0 819 503 A, 8K0819503A
• Location on the vehicle: Rear, Left
• Category: Other Air Conditioning & Heating

Purpose and vehicle placement

The presented air duct is designed for installation in the rear part of the cabin, on the left side, in the Audi A4 B8 generation model. The component operates within the ventilation and air conditioning system, directing air from the main duct to the passenger footwell area, which allows for more even temperature distribution throughout the interior. The placement on the vehicle, defined as rear – left side, facilitates clear identification of the part during selection and installation, and minimizes the risk of confusion when replacing it with other air ducts in the vehicle.

Construction and function of the air duct

The design of the duct has been developed for optimal airflow in the limited space of the floor and center tunnel. A properly shaped internal cross-section reduces pressure drops and flow noise, which translates into stable operation of the ventilation system at various fan speeds. The component works with other HVAC system ducts, creating a sealed flow path from the blower unit to the outlets in the rear of the cabin. A correctly installed duct helps maintain the proper operating conditions of the heater core and evaporator, and supports even heating and cooling of the space for rear passengers.

Benefits of using an original Audi duct

Using an original air duct in an Audi A4 B8 ensures:

• factory fitment to the floor mounts and geometry,
• proper guidance of the airflow to the rear left footwell area,
• reduction of unwanted noise and leaks in the ventilation system,
• consistency with other ventilation and air conditioning system components. Thanks to this, the duct is hassle-free to install for an experienced mechanic or a service center specializing in the Audi brand and allows for restoring the original performance parameters of the ventilation system after damage or missing components in the center tunnel.

Condition and service application

The part comes from the secondary market and is intended primarily for service applications – replacing a damaged, cracked, or missing duct in an Audi A4 B8. Proper selection of the component according to the manufacturer's markings and vehicle placement allows for maintaining compliance with factory service documentation and repair procedures. Before installation, a standard visual inspection and verification of tightness after assembling the system are recommended to ensure full functionality of the ventilation in the rear cabin area.

Related components and further reading

If you are planning a comprehensive repair or upgrade of the rear cabin area in your Audi and need other elements from the same group, such as additional air ducts, outlet grilles, or center tunnel covers, check the available parts in the Other Audi category. For a better understanding of the structural differences between individual model lines of the manufacturer, including solutions used in cooling systems and brakes, it is worth reading the article Audi RS vs other models – what is hidden under the hood and chassis?, which discusses key technical differences in the Audi range. If you are considering a wider interior upgrade using secondary market components, the guide how to transform your car interior with used steering wheels and other cabin elements, which describes the selection of parts and the principles of safe installation of original components, may also be helpful.