Vaico V10-0020 Engine Coolant Reservoir

Engine Coolant Reservoir for Audi A6 and S6

The VAICO V10-0020 engine coolant reservoir is an OE-style replacement for select Audi applications. Built to match the listed dimensions and fitment details, it is a direct option for restoring proper coolant expansion and level control on compatible Audi A6 Quattro, Audi A6, and Audi S6 models.

Key Features

• Engine coolant reservoir for the cooling system
• Measures 170 mm high, 220 mm long, and 215 mm wide
• Lightweight design at 0.698 kg
• Includes switch, as noted in fitment details
• VAICO part number V10-0020 for catalog and service reference
• Cross-reference: OE number 4A0 121 403

Product Details

VAICO VAICO focuses on replacement parts that follow OE-style specifications for European vehicles. This coolant reservoir is listed for 1995-1996 Audi A6, 1995-1997 Audi A6 Quattro, 1995-1997 Audi S6, and 1998 Audi A6 Quattro applications, with the 1998 Audi A6 Quattro note specifying fitment up to VIN 4A-W-005 000. The V10-0020 is sized to align with the original system layout and supports coolant expansion and level management in the engine bay.

For buyers searching for an Audi A6 coolant reservoir, Audi S6 expansion tank, or a replacement coolant reservoir for Audi A6 Quattro models, this part number provides a direct reference point for matching the correct cooling system component. The V10-0020 also cross-references OE number 4A0 121 403 for the same application.

Common Issues This Part Can Address

• Cracked or leaking coolant reservoir housing
• Faulty coolant level switch function
• Loss of coolant from the expansion tank area
• Incorrect reservoir fitment after prior replacement
• Cooling system service needs on aging Audi A6 and S6 vehicles

Installation Notes and Tips

Verify the OE number 4A0121403 and confirm the VIN note for 1998 Audi A6 Quattro before ordering. Compare the reservoir dimensions against the original unit to confirm fitment. Inspect hoses, caps, and level sensor connections during installation so the cooling system can be reassembled cleanly and checked for leaks after refill.

Quality Assurance

This VAICO coolant reservoir is cataloged as an aftermarket replacement for the listed Audi applications and is referenced to OE number 4A0 121 403. Fitment data is provided for 1995-1996 Audi A6, 1995-1997 Audi A6 Quattro, 1995-1997 Audi S6, and 1998 Audi A6 Quattro models.