2021-2024 Audi e-tron Poor Heating Output TSB

Owners of certain 2021-2024 Audi e-tron models may experience a significant reduction in cabin heating performance, ranging from uneven warmth to a complete lack of heat. This common complaint, often described as "poor, uneven or no cabin heating output," is addressed by Audi Technical Service Bulletin (TSB) 80 24 14 2073370/1.

This TSB outlines the diagnostic and repair procedures for the Audi e-tron poor heating problem, which stems from an internal issue within the vehicle's cooling system.

Symptoms

Customers report that the heating output in their vehicle is either insufficient, uneven, or completely absent. This directly impacts passenger comfort, especially in colder climates. If you notice your Audi e-tron poor heating performance, it's important to have it inspected.

Technical Background

The root cause of the Audi e-tron poor heating is the accumulation of deposits within the cooling system. These deposits can build up in the heat exchanger, specifically part number 4M0816413A, leading to an obstruction of coolant flow. When coolant flow is restricted, the heat exchanger cannot effectively transfer heat to the cabin, resulting in compromised or absent heating.

Important Warnings

When addressing this issue, technicians must adhere to specific precautions to prevent further damage. Audi advises:

"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 critical need for careful handling to maintain the integrity of the refrigerant system during the repair process.

Repair Procedure Summary

To resolve the Audi e-tron poor heating condition, technicians will first attempt to flush the heat exchanger. This involves flushing the component with water in the opposite direction of normal flow to dislodge and clear any accumulated deposits. If this flushing procedure is unsuccessful and deposits remain, the heat exchanger must be replaced.

Detailed cooling system flushing procedures can be found in ElsaPro or by referencing TSB 2062583, titled "80 The interior vehicle heating is insufficient, and the engine coolant is discolored." This related bulletin provides additional guidance for technicians.

Warranty Information

This repair is covered under Audi's warranty for up to 48 months or 50,000 miles. For Audi Certified Pre-Owned (CPO) vehicles, the repair is covered under the G10 claim type, requiring owner verification. If your vehicle is outside of these warranty parameters, TSB 80 24 14 2073370/1 serves as informational guidance, and the repair costs may not be covered.

Labor operations associated with this TSB include:

• Heat exchanger remove and reinstall (9383 1950): Refer to the Service Repair Time (SRT) for associated operations.
• Clean heat exchanger (9383 2999): This operation allows for up to 50 Technical Units (TU) for the required time.
• Diagnostic Time (GFF 0150 0060): Time is stated on the diagnostic protocol.

Required Parts

The primary component involved in this repair is the heat exchanger, identified by part number 4M0816413A. Technicians will consult the latest parts bulletins and the Repair Manual for any additional fasteners, bolts, nuts, and screws that may require replacement during the repair.

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Source: NHTSA ID: 10251650