2021 Audi e-tron AC Noise from Refrigerant Lines

Owners of 2021 Audi e-tron vehicles may notice an unusual noise in the cabin when the air conditioning system is running. This specific Audi e-tron AC noise is often described as being present only when the AC compressor is active and disappears when the AC is turned off. Audi has released Technical Service Bulletin (TSB) 87 21 14 2063467/1 to address this concern.

Symptoms

If you own a 2021 Audi e-tron, you might experience the following:

• A distinct noise heard inside the cabin when the air conditioning system is turned on.
• The noise is particularly noticeable when the AC compressor is actively running.
• The Audi e-tron AC noise immediately stops or is eliminated when the air conditioning system is switched off.

Workshop technicians have confirmed that this symptom is easily reproducible and that the source of the noise does not originate from within the cabin itself.

Technical Background and Diagnosis

The root cause of this Audi e-tron AC noise has been identified as direct contact between two refrigerant lines within the vehicle's air conditioning system. When the AC compressor operates, it causes vibrations in these lines. If they are in contact, these vibrations can transfer and create an audible noise that resonates into the passenger cabin.

Visual inspection, as detailed in the TSB, shows that the refrigerant lines can be positioned close enough to each other to make contact. This contact point is the source of the unwanted noise.

Repair Procedure Summary

The repair involves separating the contacting refrigerant lines to eliminate the source of the vibration and noise. Technicians will perform the following general steps:

1. Access the Area: The front storage compartment will need to be removed to gain access to the refrigerant lines in the motor bay.
2. Identify Contact Points: Technicians will visually inspect the refrigerant lines to identify where they are making contact.
3. Separate Lines: The contacting refrigerant lines must be carefully separated from each other.
4. Secure Lines: To prevent future contact, the separated lines will be secured using a hose holder, clip, or tie-wrap. This ensures they remain apart even during vehicle operation and AC compressor activity.
5. Reassembly: The front storage compartment will be reinstalled.
6. Verification: A road test will be performed after the service procedure to confirm that the Audi e-tron AC noise has been eliminated.

Warranty Information

This repair is covered under Audi's warranty program, provided the vehicle meets the following criteria:

• Standard Warranty: Up to 48 months or 50,000 miles, whichever comes first.
• CPO Vehicles: For Certified Pre-Owned (CPO) vehicles, the G10 claim type applies, and ownership must be verified.
• Out of Warranty: If your vehicle is outside of the applicable warranty period, this Technical Service Bulletin serves as informational guidance only, and repair costs may apply.

When claiming this repair, dealers should use Service Number 8744 and Damage Code 0020. The labor operations include 7007 1900 for removing and reinstalling the front storage compartment, and 8744 9999 for separating and securing the refrigerant lines, which is allocated 20 Labor Time Units (TU).

Important Considerations

All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual and are subject to review or audit by Audi Warranty. Always consult with your authorized Audi dealer for the most accurate and up-to-date information regarding parts, service, and warranty coverage.

Source: NHTSA ID: 10194630