Audi A6 C8 A7 4K Air Con Non Return Valve 4M0816805B

The Audi A6 C8 A7 4K Air Conditioning Expansion Valve is an original component of the cabin cooling system, designed for precise control of refrigerant expansion in the air conditioning system. Thanks to its factory origin from the Audi group, it ensures proper fit to the system and stable operating parameters, which translates into thermal comfort inside the vehicle. A used component allows for an economical yet technically correct repair of the air conditioning system in modern Audi models.

Specifications and technical data

• SKU: 4M0816805B
• Mark: Audi
• Condition: Used
• OEM Part Number: 4M0816805B
• Substitutable numbers: 4M0816805B, 4M0 816 805 B
• Category: A/C Expansion Valves

Purpose and Function in the Air Conditioning System

The presented valve belongs to the group of Expansion Valves and is responsible for controlled reduction of refrigerant pressure before the evaporator. A correctly selected expansion valve stabilizes compressor operation, improves cooling efficiency, and reduces the risk of excessive load on other system components.

In Audi A6 C8 and A7 4K class vehicles, the correct valve characteristics are important for:

• maintaining uniform air temperature throughout the cabin,
• efficient defrosting of windows in variable weather conditions,
• maintaining correct air conditioning operating parameters under higher thermal loads.

Original Origin and Fit for Audi

The valve was designed as an air conditioning system component by the vehicle manufacturer, which means full compatibility with the factory installation in Audi models of this generation. Original manufacturing translates to:

• precise fit with hoses and the air conditioning block,
• maintaining factory refrigerant flow parameters,
• easier diagnostics and service based on manufacturer documentation.

Thanks to this, the installation of the Audi expansion valve does not require system modifications, and the system can operate under conditions close to factory settings after replacement.

Characteristics of a Used Component

The offered valve comes from disassembly and is classified as a used original part. These types of components are often chosen for air conditioning service in newer models when the priority is to maintain compliance with factory specifications at a reasonable repair cost. A used expansion valve allows for cost reduction while maintaining proper system operating parameters, provided that other air conditioning components are functional and correctly bled and filled.

Benefits of Using an Original Expansion Valve

Using an original valve in an Audi A6 C8 or A7 4K brings a number of practical benefits:

• maintaining the cabin cooling characteristics intended by the manufacturer,
• reducing the risk of incorrect system pressure and related failures,
• easier maintenance of connection tightness thanks to factory fitting dimensions,
• possibility of subsequent system diagnostics according to standard Audi service procedures.

For workshops and users, this means a more predictable repair outcome and greater certainty that the air conditioning system will operate according to the vehicle manufacturer's intentions.

Air Conditioning Service Expansion and Related Categories

If you are planning a comprehensive repair or upgrade of the air conditioning area in your Audi and need other components from the same group, such as additional valves, control elements, or accompanying components, check the available parts in the Audi Expansion Valves category.

Technical Knowledge and Selection of Used Parts

When working with systems controlling fluid flow in a car – such as valves in air conditioning or exhaust gas recirculation systems – it is crucial to understand their role in the entire system. In the context of selecting used components, it is worth familiarizing yourself with the operating principle of similar solutions, which is why an article describing the exhaust gas recirculation system and the benefits of using used components may be helpful, available here: EGR: What it is and why consider used EGR valves.

If you are interested in a broader approach to choosing original, used components for popular car models, you will find practical tips in the guide: Best Used Car Parts – A Guide to the Most Chosen Original Parts.