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

Audi has released Technical Service Bulletin (TSB) 2067941/2 to address a potential coolant system leak originating from the N632 coolant valve in certain e-tron models. This bulletin, dated February 14, 2024, supersedes previous TSB Group 19 number 22-31 from September 22, 2022, and provides updated diagnostic and repair information. Owners of affected vehicles experiencing an Audi e-tron coolant valve leak should be aware of the symptoms and the recommended repair procedure.

Symptoms of a Coolant Valve N632 Leak

Owners may notice several indicators of an Audi e-tron coolant valve leak. These include:

• "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 dashboard warning indicates a low coolant level or a system malfunction.
• A low coolant level in the coolant expansion tank, which is not attributed to coolant escaping into the electric motor's drip container or other known leaks.

Technical Background

The root cause of this coolant leak is related to the elastomer material used in the N632 coolant valve, specifically part number 4KE963375K. In rare instances, this elastomer can allow minor leaks to occur, particularly when the valve is switched in very cold conditions. Audi has implemented an improved coolant valve in production to prevent this issue in newer vehicles.

Diagnosis Procedure

If you suspect an Audi e-tron coolant valve leak, a technician will first confirm the leak is indeed coming from the N632 coolant valve. The next step involves checking the part number of the installed valve using a scan tool. The procedure is as follows:

1. Use a scan tool (such as ODIS) to read the identification of the regulating valve.
2. Navigate through Guided Functions in ODIS to Diagnostic address 00C5.
3. Select "Read identification" and then "Read additional identification data" to display identification data of sub-systems (slaves).
4. The scan tool will record the identification result in the diagnosis log.
5. The technician will then locate the N632 coolant valve's part numbers within the scan tool's output. This identification process helps determine if the vehicle has the specific valve prone to leaking.

Repair Procedure Summary

Once the N632 coolant valve is confirmed as the source of the leak and its part number is identified, the repair involves replacing the faulty valve. The specific part number index (K or Q) determines the exact service and damage codes used for warranty claims.

• If the installed coolant valve N632 has index “K” (part number 4KE963375K), it will be replaced if necessary. The Service Number for this repair is 1985, with Damage Code 0050.
• If the installed coolant valve N632 has index “Q” (part number 4KE963375Q), it will also be replaced if necessary. The Service Number for this repair is 9384, with Damage Code 0050.

The labor operations for this repair include checking the coolant valve (N632) (labor code 9384 0199, 10 Time Units), and removing and installing the coolant valve (N632) (labor code 9384 1950, 40 Time Units). Diagnostic time (GFF) is also allocated (0150 0000, max 40 Time Units).

Required Parts and Tools

For this repair, technicians will refer to ETKA (Electronic Parts Catalog) for the most current information on fasteners, bolts, nuts, and screws required per the repair manual. The primary parts involved are the coolant valves themselves:

• 4KE963375K (Valve Electric)
• 4KE963375Q (Valve Electric)

Warranty Information

This repair is covered under Audi's warranty for up to 48 months or 50,000 miles, whichever comes first. For Certified Pre-Owned (CPO) vehicles, the G10 claim type applies, requiring owner verification. If the vehicle is outside of warranty coverage, this Technical Service Bulletin serves as informational guidance only. All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual.

What Owners Should Do

If you own a 2021-2022 Audi e-tron, e-tron Sportback, or e-tron GT and notice any signs of a coolant leak, such as visible coolant under your vehicle or the illumination of the "coolant warning lamp," it is recommended to contact your authorized Audi dealership. They can perform the necessary diagnosis using TSB 2067941/2 to determine if your vehicle is affected by the N632 coolant valve issue and perform the appropriate repair.

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Source: NHTSA ID: 10250536