2021-2023 Audi e-tron AC Noise from Compressor TSB

Symptoms

Owners of affected Audi e-tron vehicles may notice a distinct noise inside the cabin when the air conditioning system is active. This Audi e-tron AC noise is particularly noticeable when the AC compressor is running and typically disappears when the air conditioning system is turned off. Workshop findings confirm that this symptom is easily reproducible and the noise does not originate from inside the cabin itself.

Diagnosis / Trigger Conditions

The source of the Audi e-tron AC noise has been traced to several potential contact points that cause vibrations to transfer into the cabin. These include:

• Refrigerant Line Contact: Direct contact between adjacent refrigerant lines in the front motor compartment.
• Bowden Cable Clip Interference: Contact between a refrigerant line and the Bowden cable clip for the front hood release.
• Compressor Isolator Spring Misalignment: In some cases, the compressor isolator spring may not be correctly indexed in its rubber mounting, leading to an incorrectly seated compressor isolator assembly. This can create a gap between the rubber isolator and the mounting bracket.
• Service Port Mounting Interference: Contact between the service port mounting block and an adjacent line.

These contact points allow vibrations from the air conditioning compressor to resonate, causing the audible noise inside the vehicle.

Repair Procedure Summary

Technical Service Bulletin 2063467/1 outlines the steps for technicians to resolve the Audi e-tron AC noise issue. The repair focuses on identifying and eliminating the contact points causing the vibration:

1. Separate Refrigerant Lines: Technicians will inspect the refrigerant lines for any points of contact. If contact is found, the lines must be separated and secured in a separated position using a hose holder, clip, or tie-wrap.
2. Address Bowden Cable Clip Contact: If a refrigerant line is found to be contacting the Bowden cable clip, it must be separated and secured away from the clip. The retaining clip for the refrigerant line allows it to slide, which should be considered when securing the line.
3. Adjust Compressor Isolator Spring: The compressor isolator spring assembly will be inspected for proper fit. If poorly seated, the spring and/or rubber mount may need to be twisted to correctly index the spring to the rubber mount, ensuring the isolator assembly lies flat against the bracket.
4. Adjust Service Port Mounting: Any interference between the service port mounting block and adjacent lines will be corrected by pushing the service port to create a permanent clearance.
5. Documentation: Technicians are required to take photos of the customer's concern and upload them to DOC-IT with the repair order. These photos must include a date stamp, VIN reference, be in focus, and have sufficient light.

Warranty Information

This repair is covered under Audi's warranty program. The claim type is 110, applicable for up to 48 months or 50,000 miles. For Audi Certified Pre-Owned (CPO) vehicles, claim type G10 applies, requiring owner verification. If the vehicle is outside of any warranty, this Technical Service Bulletin is for informational purposes only.

The Service Number for this bulletin is 8744, and the Damage Code is 0020. Labor operations include removing and reinstalling the front storage compartment (7007 1900), separating and securing refrigerant and coolant lines (8744 1399, 70 TU), and correcting the position of compressor isolator assemblies. Diagnostic time (GFF) and road tests before and after the service are listed as having no allowance (0 TU). All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual.

Important Warnings

Owners should be aware that if their vehicle is outside of the specified warranty period, this Technical Service Bulletin serves as informational guidance only, meaning the repair may not be covered free of charge by Audi.

Additional Information

All parts and service references in TSB 2063467/1 are subject to change. Technicians are advised to consult the latest information from the Parts Department, ETKA, and the Repair Manual for current details on fasteners, bolts, nuts, and screws that may require replacement during the repair.

Source: NHTSA ID: 11002246