Audi A8 D4 4H Rear Heater Housing Mount Carrier Matrix 3.0 Diesel 4H0820329D

Audi A8 D4 4H Rear Heater Housing Mount Carrier Matrix 3.0 Diesel is an original component from the Blower motors and wheels group, designed for the rear section of the heater system in Audi models with a diesel engine. The mount ensures stable attachment of the heater housing, which translates into reliable operation of the heating and ventilation system and reduces unwanted vibrations. This solution is dedicated to users who expect factory-fit and predictable installation in their Audi.

Specifications and technical data

• SKU: 4H0820329D
• Mark: Audi
• Condition: Used
• OEM Part Number: 4H0820329D
• Substitutable numbers: 4H0820329D, 4H0 820 329 D, 4H0819351C, 4H0 819 351 C
• Location on the vehicle: Rear
• Fuel type: Diesel
• Category: HVAC Blower Motor & Wheel

Purpose and function in the heater system

The rear heater housing mount is responsible for the mechanical support and guidance of the housing in the rear part of the vehicle, in the area where the heating system for rear-seat passengers operates. In vehicles with a diesel engine, the stability of components related to the flow of air and heating medium is particularly important; therefore, the use of a dedicated mount allows for maintaining the correct position of the heater housing relative to the air ducts and control elements. This solution is designed for the specific body of the Audi A8 D4, which minimizes the risk of installation stress, leaks, and unwanted operating noises from the ventilation system. As a result, the heating system maintains predictable airflow parameters, and the blower operation remains consistent.

Compatibility with the 3.0 Diesel unit

The presented mount is intended for configurations with the 3.0 diesel engine, which means it is matched to the specific routing of lines, ducts, and accessories characteristic of this unit. In practice, this facilitates installation in the engine bay and rear space, where the heating and air conditioning system components for the Diesel version are routed. Such structural matching reduces the need for modifications or adjustments of components during replacement, which is particularly important when servicing high-end vehicles where installation repeatability and maintaining the factory geometry of the system are essential.

Installation and performance characteristics

The rear heater housing mount is a structural component that works with the heater housing and adjacent ventilation system parts. Its task is to:

• maintain the heater housing in a stable position relative to the body,
• reduce vibrations transmitted from the blower and engine operation,
• ensure proper guidance of the housing relative to the air ducts,
• facilitate disassembly and reassembly during service work. Thanks to its factory origin, the mount works with original mounting points, which promotes plug-in installation without the need for additional adapters. This solution is particularly beneficial for workshops specializing in the Audi brand, where the repeatability of service procedures is highly valued.

Condition of the component and benefits of choosing a used part

The offered mount comes from the secondary market, which allows combining a favorable purchase cost with the preservation of factory geometry and fit to the Audi body. Parts of this type, as structural elements without moving sub-assemblies, perform well in used condition, provided their integrity and correct geometry are maintained. For users considering broader modernization or repair of the drivetrain and accessories, the knowledge of selecting components from the secondary market can be an added value. Detailed discussion of identification procedures using OEM numbers and practical examples of purchase cost-effectiveness can be found in the article Why it is worth buying used gearboxes and engines – facts instead of myths, which organizes the most important issues related to used parts.

Expanding the ventilation system service in Audi

During work on the heating and ventilation system in an Audi A8 D4, it is worth considering a comprehensive approach to elements responsible for airflow, including components from the Blower motors and wheels group. If you are planning a comprehensive repair or modernization of the area related to ventilation and heating in your Audi and need other elements from the same group, such as blower motors, blower wheels, or additional mounting elements, check the available parts in the category Audi Blower motors and wheels.

Summary of application in the Audi A8 D4

Audi A8 D4 4H Rear Heater Housing Mount Carrier Matrix 3.0 Diesel is a dedicated structural element of the rear heater system, designed for stable mounting and proper cooperation with the ventilation system in versions with a diesel engine. Choosing an original mount allows for maintaining the factory routing of the heater housing, reducing vibrations, and simplifying service procedures, which is important for both individual users and professional workshops servicing the Audi brand.