Heater Air Duct / Cabin Air Supply Duct – 4K0819805

Original air supply duct / heater housing manifold duct (HVAC ventilation tunnel section delivering the air stream to the console area, windshield, or cabin vents), designed for Audi A7 Sportback, S7 and RS7 (4K / 4K8 generation) and Audi A6 C8 (type 4K2 / 4K5 / 4KA) produced from model year 2018 to 2026, including versions with 3.0 V6 TFSI (55 TFSI), 2.0 TFSI (40/45 TFSI), TDI diesel engines, and top-tier S and RS models based on the modular longitudinal MLBevo platform.

Original VAG group heating, ventilation, and air conditioning (HVAC) system component. Made of durable engineering plastic resistant to cyclic temperature fluctuations, high heat, and cockpit vibrations. Mounted under the dashboard in the immediate vicinity of the central heater unit. It is responsible for precisely, directionally, and completely sealing the air stream to the outlet vents without air pressure loss, preventing heat or cooled air from escaping under the dashboard and eliminating unwanted whistling and airflow noise.

Technical specifications:

• Catalog part number (OE): 4K0819805 / 4K0 819 805 (interchangeable with revisions from the 4K0819805A, 4K0819805B series)

• System / Category: Heating and air conditioning system / Air ducts, heaters and vents (Heater Air Duct / Climate Control Air Guide Channel)

• Function: Duct carrying air from the heater to the cabin vents

• Material / Color: Black (VAG OEM engineering plastic)

• Mounting location: Vehicle interior – cockpit / windshield area (under the dashboard, near the heater unit)

• Dedicated model: Audi A7 Sportback / S7 / RS7 (type 4K8) and Audi A6 / Avant / Allroad (type 4K / C8)

• Steering wheel side: Left (LHD – European version)

• Construction: Precisely profiled duct with factory snap-fit flanges at the connections and mounting points for mounting clips

• Condition: Original used part (100% functional – no cracks, no broken tabs on the connecting edges, sealing flanges fully intact, profile undamaged)

• Manufacturer: Audi AG / VAG (Original OEM)

Main application:

• Audi:

  • A7 Sportback (type 4K8) – model years 2018 to 2026 (all engine versions and 2- and 4-zone climate control configurations)

  • S7 Sportback (type 4K8) – model years 2019 to 2026

  • RS7 Sportback (type 4K8) – model years 2019 to 2026

  • A6 / A6 Avant / Allroad (type 4K2 / 4K5 / 4KA - C8) – model years 2018 to 2026

  • S6 / RS6 Avant (type 4K - C8) – model years 2019 to 2026

Fitment guarantee and VIN verification

Each duct undergoes a detailed inspection of the mounting flanges for cracks and is thoroughly cleaned before shipping.

Fitment / installation tip: The initial designation 4K0 (ventilation system group 819) confirms the geometry adapted to the modular MLBevo platform in the left-hand drive (LHD) version. The component can be damaged during dashboard removal, heater unit replacement, or repairs after passenger airbag deployment. A cracked or leaking duct results in reduced airflow through the air vents and an annoying whistling sound of pressurized air under the cockpit. The original OEM part ensures factory fitment with snap-fits without the need for modifications. Before purchase, we recommend comparing the OE number stamped on the part body or verifying it using the vehicle's VIN.