2021-2023 Audi e-tron / e-tron Sportback Poor Cabin Heating TSB

Symptoms of Poor Cabin Heating

Owners of 2021-2023 Audi e-tron and e-tron Sportback vehicles may notice that the cabin heating output is insufficient, uneven, or completely absent. This can significantly impact comfort, especially in colder climates. When technicians investigate, they often find obstructed or blocked coolant flow through the heat exchanger, specifically part number 4M0816413A.

Technical Background

The root cause of the Audi e-tron poor cabin heating problem is the accumulation of deposits within the cooling system. These deposits can build up in the heat exchanger, impeding the proper flow of coolant. When coolant flow is obstructed, the system cannot effectively transfer heat to the cabin, leading to compromised heating performance.

Important Warning

WARNING
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.

Repair Procedure Summary

Technical Service Bulletin (TSB) 2073370/4, which supersedes TSB Group 80 number 24-16 dated May 30, 2024, outlines the steps for addressing the poor cabin heating issue. The primary approach involves attempting to flush the heat exchanger with water, directing the flow in the opposite direction to dislodge deposits. If this flushing procedure is unsuccessful and deposits remain, the heat exchanger must be replaced.

For additional guidance on cooling system flushing procedures, technicians are directed to ElsaPro or TSB 2062583, titled "The interior vehicle heating is insufficient, and the engine coolant is discolored." This ensures a comprehensive approach to resolving the obstruction and restoring proper heating function.

Warranty Information

Audi provides specific warranty coverage for this repair under TSB 2073370/4. For new vehicles, the repair is covered under Claim Type 110, applicable up to 48 months or 50,000 miles. For Audi Certified Pre-Owned (CPO) vehicles, coverage falls under Claim Type G10, though owner verification is required. If the vehicle is outside of any applicable warranty, this Technical Service Bulletin serves as informational guidance only, meaning the repair costs would be the owner's responsibility.

The service number for this bulletin is 8023, with a damage code of 0010. Labor operations include removing and reinstalling the heat exchanger (9383 1950), cleaning the heat exchanger (9383 2999), diagnostic time (0150 0060), and charging the battery (2706 8950). Road tests before and after the service procedure are listed with no allowance (0 TU).

Owner Action

If you own a 2021-2023 Audi e-tron or e-tron Sportback and are experiencing poor, uneven, or no cabin heating, it is recommended to contact your authorized Audi dealership. Inform them of the symptoms and mention Technical Service Bulletin 2073370/4. The dealership's service department can diagnose the issue and perform the necessary repairs, which may include flushing or replacing the heat exchanger. Be prepared to provide your vehicle's details to determine warranty eligibility.

Source: NHTSA ID: 11002973