2025 Audi Q5 / SQ5 AC No Cooling TSB 2080332/1

Audi has issued Technical Service Bulletin (TSB) 2080332/1 to address specific issues affecting the air conditioning system and coolant temperature warnings in certain 2025 Audi Q5 and SQ5 models. This bulletin provides guidance for diagnosing and repairing vehicles that exhibit a lack of air conditioner cooling and an illuminated coolant temperature warning lamp.

The core of the problem, as identified by Audi, relates to the routing of a critical wiring loom during vehicle assembly. This can lead to communication issues and improper thermal management, directly impacting the vehicle's comfort and operational stability. Owners experiencing an Audi Q5 air conditioner no cooling issue should be aware of this bulletin.

Symptoms

Owners of affected 2025 Audi Q5 and SQ5 vehicles may notice one or both of the following conditions:

• The coolant temperature warning lamp lights up on the instrument cluster.
• The air conditioner does not cool the interior effectively, or at all.

These symptoms indicate a potential problem with the vehicle's cooling and thermal management systems, which can be critical for engine health and passenger comfort.

Fault Codes / DTCs

When diagnosing the Audi Q5 air conditioner no cooling problem, technicians may find specific diagnostic trouble codes (DTCs) stored in the vehicle's control units. These codes help pinpoint the nature of the electrical or communication fault:

• In the engine electronics control unit (diagnostic address 0001):
  • P021700: "Engine Coolant Over Temperature Condition"
  • U05AC00: "Invalid Data Received From Coolant Temperature Control Module"
• In the thermal management control unit (diagnostic address 00C5):
  • U063200: "Lost Communication With Fan 1"

These DTCs collectively indicate a problem with the vehicle's ability to monitor and control engine temperature, as well as a potential failure in the radiator fan's operation or communication.

Technical Background

Audi has determined that the underlying cause for these symptoms and DTCs is an incorrectly routed wiring loom. During the manufacturing process, the wiring loom was not routed according to the specified instructions on vehicles produced within a particular period. This improper routing can lead to damage or interference with the wiring, affecting critical components like the radiator fan and its communication with control modules.

Diagnosis

To diagnose the issue, a technician will first confirm the customer's complaint and verify the presence of the listed event memory entries (DTCs). The next step involves a visual inspection of the wiring loom 8MA971284. This specific loom is located between the bottom right coupling point on the engine (TMUR) and the radiator fan -V7-. It can be found on the right longitudinal member of the vehicle (when viewed in the direction of travel). Technicians will refer to diagrams such as Figure 1 in the TSB to accurately locate the wiring loom.

Figure 2 in the TSB illustrates what a damaged wiring loom looks like, guiding the technician in identifying any chafing, cuts, or other forms of damage that could disrupt electrical signals or cause a short circuit. Proper inspection is crucial to confirm that the wiring loom is indeed the source of the Audi Q5 air conditioner no cooling problem.

Repair Procedure Summary

If the wiring loom is found to be damaged during the inspection, the repair involves replacing the affected adapter harness. The specific part number for this adapter harness is 8MA971284. The repair process typically includes:

1. Inspection: Carefully checking the routing and condition of wiring loom 8MA971284.
2. Replacement: If damage is confirmed, replacing the adapter harness 8MA971284.
3. Documentation: For warranty claims, technicians are required to attach clear photos of the complaint to DOC-IT. These photos must include the vehicle's VIN and date, be in focus, and accurately show the location of the problem without any personal data (e.g., faces, license plates).

Required Parts

For this repair, the following part is required:

• Part Number: 8MA971284
• Part Description: Adapter harness
• Quantity: 1

Always consult with your Audi Parts Department and refer to ETKA for the most current information and part bulletins to ensure the correct part is ordered.

Warranty Information

This Technical Service Bulletin outlines specific claim types and labor operations for addressing the issue. If the vehicle is outside of its warranty period, this TSB serves as informational guidance only, meaning the repair may not be covered by Audi.

Claim Type: Informational only if the vehicle is outside of any warranty.

Service Number: 9713

Damage Code: 0024

Labor Operations and Codes:

• Remove and install front bumper cover: 6329 19xx
• Replace wiring harness in engine compartment: 9713 0199, 9713 5599
• GFF / Guided Functions: 0150 0060

Warranty claims must adhere to the Audi Warranty Policies and Procedures Manual and are subject to review by Audi Warranty. The claim comment should reference TSB 2080332/1.

What Owners Should Know

If your 2025 Audi Q5 or SQ5 is experiencing an Audi Q5 air conditioner no cooling condition or the coolant temperature warning lamp is illuminated, it is advisable to have your vehicle inspected by an authorized Audi service center. They can perform the necessary diagnostics to confirm if this TSB applies to your vehicle and carry out the repair using the specified procedures and parts. This ensures the issue is resolved correctly and prevents potential long-term problems related to engine cooling and climate control.

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Source: NHTSA ID: 11027383