2021-2023 Audi e-tron Poor Cabin Heating Output TSB

Symptoms

The primary symptom addressed by Audi TSB 2073370/2 is "Poor, uneven or no cabin heating output". Owners may notice that "The heating output in the vehicle is insufficient, uneven or there is no heating output." This issue specifically affects the cabin's ability to warm up effectively, leading to discomfort.

Diagnosis / Trigger Conditions

Workshop findings indicate that the complaint can be reproduced by technicians. The underlying cause for the "Audi e-tron poor heating" condition is typically an obstructed or blocked coolant flow through the heat exchanger, identified by part number 4M0816413A. Deposits accumulating in the cooling system compromise the quality of cabin heating by restricting coolant circulation.

Important Warnings

When performing any service related to the heat exchanger, technicians are advised to "Please exercise care not to contaminate the refrigerant side of the heat exchanger with water, coolant, moisture, etc. Thoroughly seal off the refrigerant side of the heat exchanger to avoid any intrusion of moisture or contaminants during the cleaning procedure." This warning highlights the importance of preventing foreign substances from entering the refrigerant system, which could lead to further issues.

Repair Procedure Summary

Audi Technical Service Bulletin 2073370/2 outlines a two-step repair process for the "Audi e-tron poor heating" condition. Initially, technicians should attempt to flush the heat exchanger (4M0816413A) with water, ensuring the flushing occurs in the opposite direction of normal coolant flow. This aims to clear any accumulated deposits.

If this flushing procedure is unsuccessful and deposits remain, the heat exchanger must be replaced. For detailed cooling system flushing procedures, technicians are directed to ElsaPro or TSB 2062583, titled "80 The interior vehicle heating is insufficient, and the engine coolant is discolored."

Required Tools or Parts

The primary component involved in this repair is the heat exchanger, part number 4M0816413A. No special tools are explicitly listed in this TSB, but standard workshop tools for cooling system service and component replacement would be required.

Warranty Information

This service is covered under warranty for vehicles up to 48 months or 50,000 miles. For Audi Certified Pre-Owned (CPO) vehicles, coverage falls under G10, requiring owner verification. If the vehicle is outside of any applicable warranty, this Technical Service Bulletin is for informational purposes only, meaning the repair cost would be the owner's responsibility.

The service number for this bulletin is 8023, with a damage code of 0010. Labor operations include "Heat exchanger remove and reinstall" (code 9383 1950) and "Clean heat exchanger" (code 9383 2999). Diagnostic time is GFF 0150 0060, with a maximum of 100 Technical Units (TU).

Owner Action

If your 2021-2023 Audi e-tron exhibits "Poor, uneven or no cabin heating output," it is recommended to schedule an appointment with an authorized Audi service center. Inform them of the symptoms and mention Audi Technical Service Bulletin 2073370/2. The service center will diagnose the issue, which may involve flushing or replacing the heat exchanger. Be aware of your vehicle's warranty status, as coverage for this repair depends on it.

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Source: NHTSA ID: 10253266