2024-2026 Audi A/C Cooling Output Insufficient TSB 2064077/7

Owners of certain 2024-2026 Audi vehicles may experience their air conditioning system not cooling the interior effectively. This issue, described in Audi Technical Service Bulletin (TSB) 2064077/7, points to a common problem: an insufficient amount of refrigerant in the system, often caused by leaks in the air conditioning system evaporator.

Symptoms

Customers typically report that the air conditioning does not cool the interior of the vehicle. The primary symptom is insufficient cooling output from the air conditioning system. Workshop findings confirm that the customer's complaint can be reproduced and that the refrigerant circuit is not filled with the required amount of refrigerant.

Diagnosis

The evaporator, a key component of the air conditioning system, is identified as a potential source of leaks. Since it's not easily accessible, technicians use specific methods to detect leaks without direct access. These methods include:

• Electronic Leak Detector: Technicians check for refrigerant at the center vents by setting the blower to the lowest level and air distribution to the dash panel vents. This method helps identify refrigerant presence in the cabin (Figure 2 in the TSB illustrates this).
• Leak Detection Additive: If a leak detection additive is introduced into the refrigerant circuit, deposits of the additive may become visible at the condensation drain after the A/C system has operated under high load for a sufficient period (Figure 3 in the TSB shows this). The additive can also be checked on the vehicle underbody (Figure 4).
• Leak Test with Forming Gas: This method is applicable for refrigerant circuits using R134a, R1234yf, and R744. Detailed procedures and required tools for this test are outlined in the training module "ATP 611 05_2022: SoST - Leak test on the refrigerant circuit R134a, R1234yf and R744," which is referenced in the attachments of TSB 2064077/7.

Important Warnings

Owners and technicians should be aware of critical instructions related to the diagnosis and repair:

• WARNING: "For vehicles with refrigerant R744 only the 'Leak test with forming gas' method is allowed."
• NOTICE: "Should the evaporator for the Q5 be confirmed leaking by way of this diagnostic procedure and replacement of the evaporator is performed it is necessary to loosen and refasten the Relay and Fuse Carrier 3 -SR3- (shown in figure 5, position 1) in the course of the repair. During reassembly of the vehicle, it is critically important that this relay and fuse carrier is reinstalled in its correct original position. Failure to reinstall the Relay and Fuse Carrier 3 precisely will result in water intrusion and subsequent component damage."

Repair Procedure Summary

If a leak is confirmed in the evaporator, the primary repair involves replacing the evaporator unit. After the replacement, it is crucial to re-check the entire refrigerant circuit for any additional leaks. Any further leaks must be addressed according to the instructions provided in the Workshop Manual.

For warranty claims, photo or video documentation is required. This documentation must clearly show the complaint, include the vehicle's VIN and date, be unedited, in focus, well-lit, and mark the problem's location. It must not show any persons, faces, or license plates.

Warranty Information

Warranty claims for this repair, identified by Service Number 8760 and Damage Code 0050, must adhere to the Audi Warranty Policies and Procedures Manual. If the vehicle is outside of its warranty period, this Technical Service Bulletin (TSB 2064077/7) serves as informational guidance only.

Labor Operations

Technicians will use the following labor operations for this service:

• Check evaporator: 8760 0199
• Remove and install evaporator: 8760 19xx
• GFF / Guided Functions: 0150 0060

Owner Action

If you are experiencing an Audi A/C cooling insufficient condition, it is recommended to schedule an appointment with an authorized Audi service center. Inform them of the symptoms and mention TSB 2064077/7. The technicians will perform the necessary diagnostic steps to confirm an evaporator leak and carry out the appropriate repair.

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Source: NHTSA ID: 11021444