Vaico V10-4399 Engine Coolant Reservoir

Engine Coolant Reservoir Overview

The VAICO engine coolant reservoir, part number V10-4399, is a direct-fit replacement for select Audi and Volkswagen applications. It is built to match OE reference numbers used on these vehicles, making it a practical choice when replacing a cracked or leaking expansion tank.

Key Features

• Direct-fit coolant reservoir for select European vehicles
• Matches OE reference 5Q0121407G on multiple applications
• Compact tank dimensions: 185 mm long, 180 mm wide, 135 mm high
• Lightweight plastic reservoir design for cooling system service
• VAICO replacement part number V10-4399

Detailed Description

V10-4399 is an engine coolant reservoir designed for fitment on 2015-2017 Volkswagen e-Golf, 2015-2017 Volkswagen Golf R, 2015-2017 Volkswagen Golf SportWagen, 2017 Volkswagen Golf Alltrack, 2016-2017 Audi TT Quattro, 2017 Audi A3, 2017 Audi A3 Quattro, and 2017 Audi S3. This part cross-references Monroe Shocks & Struts (e.g., 5Q0 121 407 D, 5Q0 121 407 F) for the same application.

As part of VAICO’s cooling-system product line, this reservoir follows OE-style replacement requirements for vehicles that use the listed factory reference numbers. The reservoir dimensions and low weight support a straightforward service replacement when the original tank shows signs of age, damage, or coolant loss. V10-4399 is a fitment-specific cooling component for Audi A3 and Volkswagen Golf-family platforms.

What It Is Used For

• Replacing a coolant reservoir with cracks or physical damage
• Restoring coolant storage capacity in the cooling system
• Addressing coolant loss from a leaking expansion tank
• Servicing vehicles that require OE reference 5Q0121407G or 5Q0121407F

Installation Notes and Tips

Verify the OE number on the original reservoir before ordering. Confirm the vehicle’s model year and application details against the fitment list, especially on Audi A3, Audi S3, and Volkswagen Golf-platform vehicles. Inspect hoses, caps, and surrounding cooling-system components during replacement to avoid repeat leaks.

Quality Assurance

VAICO supplies OE-style replacement parts for European vehicle cooling systems. This part is identified by part number V10-4399 and is listed with factory reference-based fitment for the specified Audi and Volkswagen applications.