Audi A6 Quattro A/C Receiver Drier Replacement Guide (2017-2024)
Learn why this small part is critical for your Audi's A/C system and when you must replace it.
- For 2017-2018 (C7) models, the drier is a replaceable cartridge; for 2019-2024 (C8) models, it's part of the condenser.
- The receiver drier MUST be replaced by a professional any time the A/C system is opened for service.
- This is not a DIY job as it requires specialized refrigerant handling equipment and knowledge.
- On 2017-2018 models, have a technician rule out a faulty A/C pressure sensor before performing major repairs.
Critical Generation Difference: C7 vs. C8 Models
The 2017-2024 year range for the Audi A6 Quattro covers two different vehicle platforms, the C7 and C8. How the A/C receiver drier is serviced is completely different between them.
- 2017-2018 Audi A6 (C7 Platform): On these models, the receiver drier is a separate desiccant cartridge that can be purchased and replaced on its own. It fits into a special housing on the side of the A/C condenser. This makes it a serviceable aftermarket part.
- 2019-2024 Audi A6 (C8 Platform): For these newer models, Audi integrated the receiver drier into the A/C condenser assembly. It is not sold as a separate, standalone part. If the drier fails on a C8 model, you must replace the entire A/C condenser.
Symptoms of a Failing A/C Receiver Drier
A saturated or failing receiver drier can cause several issues. Since its failure can lead to catastrophic damage if the desiccant bag ruptures, it's important to recognize the signs.
- Poor or No Cooling: This is the most common symptom. A clogged drier restricts refrigerant flow, preventing the A/C from blowing cold air.
- Musty Smell: When the desiccant can no longer absorb moisture, mold can grow inside the A/C system, causing an unpleasant odor from the vents.
- Rattling Noises: A rattling sound from the engine bay with the A/C on could mean the desiccant bag has broken. This is a serious issue, as loose desiccant can circulate and destroy the compressor and other components.
- Frost on A/C Lines: A severe clog in the drier can cause a rapid temperature drop across the component, leading to visible frost or ice on A/C lines or the condenser.
Pro Tip for C7 (2017-2018) Owners
Before condemning your receiver drier, be aware that a faulty A/C pressure sensor is a very common problem on C7 platform Audis. This sensor can fail and incorrectly tell the system to shut down the compressor, resulting in warm air. This is often a simpler and less expensive fix, so proper diagnosis is essential.
Choosing the Right Aftermarket Part (2017-2018 Models)
For C7 models, you can buy an aftermarket desiccant cartridge. The original Audi part is made by a high-quality supplier like Mahle or Behr. Aftermarket brands like Nissens offer a more budget-friendly alternative.
Nissens is a known manufacturer of A/C components. For a simple service part like a desiccant bag, a quality aftermarket brand is often a perfectly acceptable choice, especially since the majority of the replacement cost is labor. Some mechanics have noted occasional fitment issues with aftermarket A/C parts, but many use them regularly without problems. The most important factor is that the part is new and installed correctly into a clean, properly serviced A/C system.
Replacement Cost
Replacing the receiver drier is a labor-intensive job because the A/C system must be professionally evacuated and recharged. The labor cost is the most significant part of the expense.
| Part | Estimated Cost |
|---|---|
| New Aftermarket Drier (Nissens) | $56.63 |
| New OEM Drier Cartridge | $70 - $120 |
| Shop Labor | $450 - $650 |
| Total Estimated Cost | $500 - $770 |
Cost estimates are approximate and can vary based on your location and the specific repair shop. Labor often includes a full A/C system service.
Frequently Asked Questions (FAQ)
When must I replace the receiver drier?
The receiver drier must be replaced every time the A/C system is opened for repairs. This includes replacing the compressor, condenser, evaporator, or any A/C hose. Failure to do so will introduce moisture into the system, likely void the warranty on your new parts, and lead to premature failure.
Can I replace the A/C receiver drier myself?
No, this is not a DIY job for a home mechanic. Federal regulations and safety require the use of special equipment to recover the old refrigerant. The system must then have a deep vacuum pulled on it to remove all air and moisture before being recharged with the precise amount of refrigerant and oil. This work must be done by a certified A/C technician.
What happens if I don't replace a saturated drier?
If you don't replace a saturated drier when servicing the system, moisture will remain. This moisture mixes with refrigerant to form corrosive acids that eat away at metal components from the inside out, leading to leaks and the failure of expensive parts like the A/C compressor. If the drier desiccant bag ruptures, it will send debris throughout the system, causing a catastrophic failure that requires replacing almost every major A/C component.
Why can't I buy just the drier for my 2020 A6?
For the C8 platform (2019-2024), Audi redesigned the condenser to have the drier permanently integrated. It is not designed to be serviced separately. If the drier has failed or the system has been opened, the entire condenser assembly must be replaced to ensure the system has a fresh desiccant charge.
Technical Specifications
OEM Part Numbers: 4H0820191A 8K0898191
Serviceable desiccant cartridge for C7 models (2017-2018). Integrated into condenser on C8 models (2019-2024).
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Audi A6 Quattro: