2021-2022 Audi e-tron Coolant Leak from Valve N632

Audi has released Technical Service Bulletin (TSB) 2067941/3 to address a potential coolant system leak from the coolant valve N632 in certain 2021-2022 Audi e-tron and e-tron Sportback models. This TSB, which supersedes an earlier bulletin (Group 19 number 24-50 dated February 14, 2024), provides updated warranty and service information for diagnosing and repairing this issue. Owners may notice an Audi e-tron coolant leak N632 through various symptoms.

Symptoms of a Coolant Leak

Owners of affected Audi e-tron vehicles might observe several indicators of a coolant leak:

• "Traces of coolant can be seen under the vehicle." This is often the most direct sign of a leak.
• "The coolant warning lamp appears in the instrument cluster." This light indicates a low coolant level or a system malfunction.
• A low coolant level in the coolant expansion tank, which is not due to normal consumption or other known leaks.
• The issue might also be identified by a workshop during routine service, even if the customer hasn't noticed explicit symptoms.

Technical Background

The root cause of this Audi e-tron coolant leak N632 is related to the elastomer material used in the coolant valve N632, specifically part number 4KE963375K. In rare cases, this elastomer can lead to minor leaks, particularly when the valve is switched in very cold conditions.

Diagnosis Procedure

To accurately diagnose the coolant leak and confirm if it originates from the coolant valve N632, technicians follow a specific procedure:

1. Check the installed part number: If a leak is suspected from the coolant valve N632, the first step is to verify the part number of the installed component. This is crucial because only specific versions of the valve are prone to this issue.
2. Use a scan tool: Technicians utilize the ODIS scan tool to read out which regulating valve is fitted. This involves navigating through Guided Functions:
   • `Guided Functions in ODIS >> Diagnostic address 00C5 >> Guided Function >>