Audi A/C Receiver Drier - Genuine Audi 4F0820191B

Product Information

The A/C receiver drier is essentially a filter for your vehicle's air conditioning, specifically in systems that use a thermal expansion valve. Its primary function is to remove moisture and filter debris from the refrigerant, ensuring the system operates efficiently and without damage. The receiver drier is located on the high-pressure side of the A/C system, between the condenser and the expansion valve. Usually, it is mounted onto the condenser itself. Inside the drier, there’s a filter and desiccant material that absorbs moisture from the refrigerant. Moisture in the A/C system can cause significant issues, such as corrosion, ice formation, or damage to components like the compressor, as it can mix with the refrigerant to form acids.

The receiver drier must be replaced whenever the A/C system is opened, such as during repairs or when components like the compressor or condenser are replaced. This is because the desiccant inside the drier has a limited capacity to absorb moisture, and once the system is exposed to the atmosphere, it can quickly become saturated. A saturated drier cannot effectively remove moisture, leading to potential damage and decreased system efficiency. Additionally, debris that has been filtered out of the refrigerant can accumulate over time, reducing the system's performance.

Regular replacement of the receiver drier during major A/C repairs or maintenance ensures the system remains clean, dry, and functioning optimally.

• Saturation: When the desiccant inside the receiver drier reaches saturation, it allows water to circulate in the refrigerant. Water in the cooling system can cause ice clogs, and even form a type of corrosive acid which eats away the various other components of the AC system
• Debris clogging: If for whatever reason debris such as flecks of coating, dust, or shop grit gets into the AC system the A/C receiver drier should filter it out. If there is a lot of it, it could cause a clog which effectively shuts down the air conditioning.
• Leaks: The receiver drier does contain a pressurized liquid refrigerant which must be sealed when installed. New seals should always be included with the A/C receiver drier, never install one without fresh seals or you may encounter leaks that will result in A/C failure.

About Genuine Audi

The original parts used by Audi to build your car are available as replacement parts under the “Genuine Audi” brand. Manufactured under the direction of Audi, expect excellent quality and a premium price since these parts are available exclusively through the Audi Dealership network.

You may not realize this, but the parts that make up your Audi are not necessarily manufactured by Audi. No cause for concern, as Audi designs the part, hires a manufacturer, and ensures its quality to you. In fact, many of these manufacturers have been making parts for Audi for decades. In our industry these manufacturers are called OEM (Original Equipment Manufacturers), and these are often brands you recognize, including Lemforder, ZF, Sachs, Bosch, Valeo, Zimmermann, Siemens VDO, Corteco, and more. Don’t be surprised to open that Genuine Audi parts box and find an OEM branded part inside, simply with the addition of an Audi logo.

Be sure to keep an eye out for OE tags on our product pages to quickly identify parts coming direct from OE manufacturers. That extra bit of insight could save you some serious money while shopping! Refer to our OE Academy for further information regarding the OE/OEM tags throughout the site.