Volkswagen LT 35 Coolant Expansion Tank Coolant Overflow Reservoir 2D0121403K

Visual condition of the part

The product shows signs of use visible in the photos.

Volkswagen LT 35 Coolant Expansion Tank Coolant Overflow Reservoir is an original cooling system component designed to maintain a stable fluid level and safe engine operating conditions. Thanks to the factory Volkswagen design, this reservoir ensures proper fluid volume compensation and efficient system venting. This used OEM component is a sensible choice for workshops and users looking for a proven service solution rather than replacements of unknown origin.

Specifications and technical data

• SKU: 2D0121403K
• Mark: Volkswagen
• Condition: Used
• OEM Part Number: 2D0121403K
• Substitutable numbers: 2D0121403K, 2D0 121 403 K
• Category: Expansion & Overflow Tanks

Function and role in the cooling system

The expansion tank in the Volkswagen LT 35 acts as a buffer element for the cooling system, allowing for fluid level monitoring and compensation for volume changes during engine heating and cooling. A properly selected reservoir:

• stabilizes pressure in the cooling system,
• facilitates venting and leak checks,
• ensures clear monitoring of the coolant level,
• reduces the risk of engine overheating.

Thanks to a design compliant with the vehicle manufacturer's requirements, the reservoir works with factory hoses, connectors, and mounts, which translates into seamless integration with the cooling system.

Original origin and fitment

As a Volkswagen brand component, the expansion tank was designed specifically for the engine bay geometry of the LT 35 model. This means:

• retention of the factory mounting position,
• compatibility with original brackets and supports,
• correct routing of coolant hoses,
• appropriate working capacity matched to the system's characteristics.

The original reservoir from this series also has assigned interchangeable numbers, which facilitates verification of compatibility with a specific vehicle configuration and part selection based on service documentation.

Used condition and service application

The presented expansion tank is offered in used condition, making it an attractive solution for intensively used vehicles, fleets, and workshops specializing in the service of Volkswagen commercial vehicles. A used OEM component allows you to:

• maintain the factory operating parameters of the cooling system,
• reduce repair costs compared to new parts,
• maintain the technical consistency of the vehicle with the original specification.

It is a practical choice when replacing a reservoir after mechanical damage, housing cracks, or leaks detected around the connectors.

Support in selection and safe online purchase

To minimize the risk of error when purchasing a used expansion tank, it is worth verifying the part's compatibility with the vehicle documentation and the numbers assigned by the manufacturer. For users who want to streamline the selection and purchasing process, a practical guide has been prepared – detailed tips can be found in the material Safe purchase of used car parts online – a step-by-step guide, which describes, among other things, strategies for selection by OEM numbers and good purchasing practices.

Complementary Volkswagen expansion tanks

If you are planning a comprehensive repair or upgrade of the cooling system area in your Volkswagen and need other elements from the same group, such as additional reservoirs, mounting elements, or compatible post-facelift variants, check the available parts in the Volkswagen expansion tanks category.