Heater Air Duct / Cockpit Ventilation Duct (Left Side) – 4K1819725

Original heater and air conditioning air distribution duct (ventilation duct delivering the air stream from the central HVAC module to the left dashboard zone / to the driver's side vent), designed for Audi A7 Sportback, S7 and RS7 (4K / 4K8 generation) and Audi A6 C8 (type 4K2 / 4K5 / 4KA) models produced from 2018 to 2026, including versions with 3.0 V6 TFSI (55 TFSI), 2.0 TFSI (40/45 TFSI), TDI diesel engines and S and RS variants, based on the modular longitudinal MLBevo platform.

Original VAG heating and ventilation system component. Made of durable technical plastic with high thermal resistance, resistant to deformation and cracking caused by temperature changes. Mounted under the dashboard on the crossmember reinforcement. It is responsible for the direct, tight, and silent delivery of the hot or cooled air stream to the left air outlet, eliminating pressure losses and air whistling inside the cockpit.

Technical specifications:

• Catalog part number (OE): 4K1819725 / 4K1 819 725 (interchangeable with revisions from the 4K1819725A and 4K1819725B series); the symmetrical right-side element is available under number 4K1819726

• System / Category: Heating, ventilation and air conditioning (HVAC) / Air ducts, ventilation tunnels and distributor ducts (Air Duct / Ventilation Air Channel Dashboard Left)

• Function: Dashboard air vent duct / duct – left side (driver)

• Material: VAG OEM polymer resistant to high temperatures

• Mounting location: Vehicle interior – under the dashboard on the left side (connection between the heater and the driver's vent)

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

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

• Mounting: Push-fit into factory socket connections / mounting clips

• Condition: Original used part (100% functional – no cracks, no damage to mounting flanges and clips, no thermal deformation)

• Manufacturer: Audi AG / VAG (Original OEM)

Main application:

• Audi:

  • A7 Sportback (type 4K8) – model years from 2018 to 2026 (all TFSI, TDI engine versions, MHEV systems)

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

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

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

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

Fitment guarantee and VIN verification

Each air vent component undergoes an inspection of the socket connection edges and a check for mechanical damage before shipping.

Fitment / mounting tip: The initial designation 4K1 (ventilation group 819) with the odd ending 725 uniquely defines the left side for left-hand drive vehicles (LHD – European version). The duct forms a set with the right side (4K1819726). Replacement is necessary in the event of cracked plastic or broken flanges when removing the dashboard after a collision. The original OEM component ensures a perfect fit to the heater housing and side grille without gaps and unwanted noises during blower operation. Before purchase, we recommend comparing the OE number on the part body or verifying it using the vehicle's VIN.