2021-2024 Audi V6 TFSI Coolant Loss from Coolant Pump TSB

Audi has released Technical Service Bulletin (TSB) 2070349/1 to provide guidance on diagnosing and addressing customer complaints related to Audi V6 TFSI coolant loss and associated warning lights. This bulletin applies to various 2021-2024 Audi models equipped with the V6 TFSI engine, including the A6, A7, A8, Q7, Q8, S4, S5, S6, S7, RS 5, and SQ5.

The TSB aims to help technicians accurately identify the source of coolant issues, distinguishing between normal operational characteristics and actual component failures. It provides a clear procedure for inspecting the cooling system, particularly focusing on the coolant pump.

Symptoms of Coolant Loss

Owners of affected Audi V6 TFSI vehicles may notice the following conditions:

• Coolant loss/leak: Visible traces of coolant under the vehicle or a noticeable drop in the coolant reservoir level.
• Coolant warning lamp: Illumination of the coolant warning light on the instrument cluster.

Workshop findings often indicate that the coolant pump is the suspected source of the leak when these symptoms are reported.

Important Note on Normal Coolant Seepage

Audi TSB 2070349/1 highlights a crucial detail regarding the coolant pump. A small quantity of coolant, specifically up to 3 ml over 100 hours of operation, may escape onto the drip cup. This is considered normal and occurs due to the lubrication and cooling of the coolant pump's seal.

This normal seepage does not constitute a reason for a complaint or a repair. Technicians are advised to differentiate this from an actual leak requiring intervention. Therefore, if you observe minor traces of coolant, it might be within normal operating parameters for your Audi V6 TFSI coolant loss.

Diagnosing the Coolant Leak

To accurately diagnose a coolant leak, technicians are instructed to follow a precise procedure:

1. Clean and Dry: Thoroughly clean and dry the area around any suspected leak, as well as any traces of coolant.
2. Refill System: Fill the cooling system to its maximum level.
3. Visual Inspection: Perform a visual check while the engine is idling and at higher engine speeds, up to approximately 2500 rpm, to assess for any active leaks.
4. System Leak Check: Conduct a comprehensive check of the cooling system for leaks, following the guidelines in the Workshop Manual.
5. Reassessment: Reassess the suspected leak area after these checks.

If no further coolant leak is detected after these steps, the vehicle should be observed without replacing any parts. However, if a coolant leak is detected again, the component causing the leak must be replaced.

Repair Procedure Summary

If an actual leak is confirmed, the repair involves replacing the faulty component, typically the coolant pump. The general steps for addressing the issue, as outlined in TSB 2070349/1, include:

• Removing and installing noise insulation to access the coolant pump area.
• Checking and topping up the coolant, cleaning the area, and performing a visual check.
• Conducting a thorough check of the cooling system for leaks.
• If determined to be faulty, removing and installing a new coolant pump.

Specific labor operations associated with this TSB include Service Number 1950 and Damage Code 0050. Labor Operation codes such as 1082 19XX (remove/install noise insulation), 1938 3599 (check/top up coolant, clean, visual check), 1901 0150 (check cooling system for leaks), and 1950 19XX (remove/install coolant pump if faulty) are provided for warranty claims.

Warranty Coverage

This Technical Service Bulletin is applicable for warranty claims under Claim Type 110, covering vehicles up to 48 months or 50,000 miles. For Certified Pre-Owned (CPO) vehicles, Claim Type G10 applies, requiring owner verification. If the vehicle falls outside of these warranty parameters, this TSB serves as informational guidance only, and any repairs would typically be at the owner's expense. All warranty claims must adhere to Audi Warranty policies and procedures.

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Source: NHTSA ID: 10236572