2017-2026 Audi Models AC Cooling Insufficient TSB

Audi has issued Technical Service Bulletin (TSB) 2064077/5, which supersedes TSB Group 87 number 24-70 dated March 29, 2024, to address concerns regarding insufficient air conditioning cooling output in various 2017-2026 Audi models. Owners may notice that the air conditioning does not cool the interior effectively, or that the overall cooling output of the air conditioning system is insufficient.

Symptoms

Owners of affected Audi models may experience the following symptoms related to their air conditioning system:

• "The air conditioning does not cool the interior."
• "The cooling output of the air conditioning system is insufficient."

These issues are typically traced back to an insufficient amount of refrigerant within the system, often due to a leak.

Diagnosis and Trigger Conditions

When a customer reports an issue with the air conditioning, technicians will first confirm the customer's statement. Workshop findings often indicate that the refrigerant circuit is not filled with the required amount of refrigerant, pointing to a leak.

An insufficient amount of refrigerant is usually caused by leaks in the refrigerant circuit. For the vehicles covered by this TSB, the evaporator of the air conditioning system is a potential source of a leak. This component is fitted within the air conditioning unit and is not easily accessible from outside.

To detect leaks, technicians may use several methods:

• Electronic leak detector: This device is used to check for refrigerant leaks around the center vents. The air conditioner blower is set to its lowest level, and air distribution is directed to the dash panel vents.
• Leak detection additive: If a leak detection additive is introduced into the refrigerant circuit, deposits of the additive may become visible on the condensation drain or under the vehicle's underbody after the air conditioner has operated at high load for a sufficient period.
• Leak test with forming gas (calibration gas): This method is used for refrigerant circuits that use R134a, R1234yf, and R744 refrigerants.

Important Warnings

Audi has issued specific warnings for technicians and owners related to this issue:

• R744 Refrigerant Systems: For vehicles equipped with R744 refrigerant, only the "Leak test with forming gas" method is permitted for leak detection.
• Relay and Fuse Carrier 3 -SR3- Reinstallation: If an evaporator leak is confirmed for the Audi Q5 and the evaporator is replaced, it is critically important to correctly loosen and refasten the Relay and Fuse Carrier 3 -SR3-. Failure to reinstall this component precisely in its original position can lead to water intrusion and subsequent component damage.

Repair Procedure Summary

If diagnostic procedures confirm a leak in the evaporator, the repair involves replacing the evaporator. After the replacement, the refrigerant circuit must be thoroughly checked for any further leaks. Any additional leaks found must be addressed according to the instructions provided in the Workshop Manual. Technicians must pay close attention to the correct reinstallation of the Relay and Fuse Carrier 3 -SR3- to prevent future issues.

Warranty Information

This repair, outlined in TSB 2064077/5, is covered under specific warranty conditions:

• Claim Type: 110 (up to 48 months/50,000 miles) or G10 for Audi Certified Pre-Owned (CPO) vehicles, requiring owner verification.
• If the vehicle is outside of any applicable warranty, this Technical Service Bulletin serves as informational guidance only.
• Service Number: 8760.
• Damage Code: 0050.
• Labor Operations:
  • Checking the evaporator: Labor operation 8760 0199.
  • Removing and installing the evaporator: Labor operation 8760 19xx.
• Diagnostic Time: No allowance (0 TU) is provided for GFF diagnostic time or road tests before and after the service procedure.
• Claim Comment: All claims must include the comment "As per TSB 2064077/5."

All warranty claims must comply with the Audi Warranty Policies and Procedures Manual and are subject to review or audit by Audi Warranty.

Source: NHTSA ID 11005916