Vaico V10-4401 Engine Coolant Reservoir

Engine Coolant Reservoir for Audi Applications

The VAICO V10-4401 engine coolant reservoir is an OE-style replacement tank for select Audi cooling systems. Built to match the listed dimensions and application requirements, it supports proper coolant expansion and recovery in vehicles such as the Audi Q5, S4, S5, and SQ5.

VAICO’s VAICO product line focuses on replacement components engineered for European vehicle service needs, with fitment and form factor aligned to the original application.

Key Features

• Engine coolant reservoir for radiator and cooling system service
• Dimensions: 145 mm height, 305 mm length, 290 mm width
• Lightweight construction at 0.645 kg
• OE-reference fitment for applications using OE No. 8K0121405N
• Part number V10-4401 for ordering and catalog lookup
• Compatible with select Audi Q5, S4, S5, and SQ5 models

Detailed Description

This coolant expansion tank is intended for vehicles that require the OE-style reservoir referenced by part number V10-4401. It cross-references OE-style numbers including 8K0 121 146 and 8K0 121 405 A, and it is listed for 2009-2017 Audi Q5, 2012-2017 Audi S5, 2014-2017 Audi SQ5, and 2013-2015 Audi S4 applications. The reservoir dimensions help confirm fitment during replacement work, especially when matching the original tank shape and mounting layout.

Use this part when replacing a cracked, leaking, or discolored coolant reservoir on an Audi cooling system. The VAICO V10-4401 is a direct-fit style replacement for the specified OE application and is cataloged for the listed Audi models with OE No. 8K0121405N.

What It Helps Fix

• Coolant loss from a cracked or split reservoir
• Overflow or expansion tank leakage
• Low coolant level warnings caused by reservoir failure
• Visible coolant staining around the tank body or seams
• Cooling system service needs on Audi Q5, S4, S5, and SQ5 models

Installation Notes and Tips

Verify the OE number and reservoir dimensions before installation to confirm application match. Inspect the cap, hoses, and surrounding cooling system components for wear or contamination during replacement. After installation, refill the cooling system with the correct coolant specification and bleed air from the system according to the vehicle service procedure.

Quality Assurance

VAICO parts are cataloged for European vehicle service applications and are referenced here by OE-style fitment data. This part cross-references OE numbers 8K0 121 405 N and 8K0 121 405 H for the same application.