2021-2023 Audi HVAC Blower Adjustment Issue TSB

Audi has issued Technical Service Bulletin (TSB) 2071139/3 to address an intermittent issue affecting the HVAC system in various 2021-2023 Audi models, including the popular Audi e-tron. This bulletin, dated April 5, 2024, supersedes a previous bulletin, Group 87 number 23-54, from August 25, 2023, reflecting updated information and model year coverage.

The TSB specifically details a condition where the fan control strip on the lower HVAC screen may occasionally disappear, preventing owners from adjusting the fan speed. This can be a frustrating experience, as the HVAC blower setting adjustment not possible situation directly impacts cabin comfort.

Symptoms

Owners of affected Audi vehicles may observe that the fan control strip in the lower HVAC screen, typically used for increasing or decreasing the fan speed, does not appear. When this symptom occurs, the center strip for the fan control is blank, making it impossible to change the fan speed. This means the fan speed cannot be controlled through the infotainment system.

This issue is described as intermittent and can be difficult to reproduce consistently. Despite its sporadic nature, it directly impacts the functionality of the vehicle's climate control system.

Important Warnings

Audi explicitly advises against replacing any parts to resolve this specific symptom. The manufacturer states that parts replacement will not resolve this issue, and any components replaced for this condition under warranty will be debited. This warning is crucial for owners to avoid unnecessary repairs and costs.

Furthermore, this TSB is purely informational and does not fall under any Audi Warranty coverage. Owners should be aware that any actions taken based on this bulletin are not covered by standard warranty provisions.

Diagnosis / Trigger Conditions

The primary diagnostic condition for this issue is the observation that the fan control strip in the lower HVAC screen is blank, and the fan speed cannot be adjusted. Audi notes that this symptom is difficult to reproduce consistently, indicating its intermittent nature. The technical background suggests that the intermittent symptom is related to the infotainment system and is currently under analysis, with a service solution still in discussion.

Repair Procedure Summary

The recommended solution for the 'HVAC blower setting adjustment not possible' problem is to restart the MMI (Multi Media Interface) system. This simple procedure will typically restore the fan control to the screen, allowing normal operation of the HVAC blower settings. The restart process is quick, usually taking less than a minute.

To perform an MMI restart, owners should press and hold the On/Off button for at least 10 seconds. This action initiates the system reboot. The procedure is also detailed in the vehicle's owner's manual under the section