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

Symptoms of Poor Cabin Heating

Owners of 2021-2023 Audi e-tron, e-tron Sportback, Q8 e-tron, and SQ8 e-tron models may notice that the heating output in their vehicle's cabin is insufficient, uneven, or completely absent. This directly impacts passenger comfort, especially in colder climates.

Diagnosis and Technical Background

When technicians investigate reports of Audi e-tron poor cabin heating, they often find obstructed or blocked coolant flow through the vehicle's heat exchanger, specifically part number 4M0816413A. This obstruction is typically caused by deposits that accumulate within the cooling system. These deposits can compromise the quality of cabin heating by preventing proper heat transfer.

Important Warnings for Service

Audi emphasizes specific precautions for technicians performing this service. When working on the heat exchanger, it is crucial to avoid contaminating the refrigerant side with water, coolant, or moisture. Technicians must thoroughly seal off the refrigerant side of the heat exchanger to prevent any intrusion of moisture or contaminants during the cleaning procedure.

Furthermore, to support warranty claims and diagnosis, service centers are required to document the customer's concern with a video of the debris in the heat exchanger. Any photos submitted must include a date stamp, VIN reference, and be in focus with sufficient lighting.

Repair Procedure Summary

To address the Audi e-tron poor cabin heating issue, service technicians will first attempt to clear the deposits by flushing the heat exchanger with water. This flushing is performed in the opposite direction of normal coolant flow to dislodge any obstructions. If this flushing procedure is unsuccessful and deposits remain, the heat exchanger will need to be replaced.

For detailed cooling system flushing procedures, technicians are directed to refer to ElsaPro or Technical Service Bulletin (TSB) 2062583, titled "80 The interior vehicle heating is insufficient, and the engine coolant is discolored." This TSB provides additional guidance for handling discolored engine coolant, which can be a symptom of these internal deposits.

Required Parts

The primary component that may need attention or replacement is the heat exchanger, identified by part number 4M0816413A.

Owner Action

If you are experiencing poor, uneven, or no cabin heating in your 2021-2023 Audi e-tron, it is recommended to schedule an appointment with an authorized Audi service center. This issue is covered under Audi's New Vehicle Limited Warranty for up to 48 months or 50,000 miles, whichever comes first. For Audi Certified Pre-Owned (CPO) vehicles, coverage is provided under the G10 claim type. If your vehicle is outside of these warranty periods, this Technical Service Bulletin 2073370/3 serves as informational guidance for diagnosis and repair.

Source: NHTSA ID 11002145