Smart C450 Radiator Expansion Overflow Reservoir Tank Bottle 000 5768 V009

Smart C450 Radiator Expansion Overflow Reservoir Tank Bottle is an original cooling system component from the Expansion tanks group, designed for stable engine operation under demanding conditions. This used, factory-original component ensures proper coolant volume compensation, which translates into safe engine operating temperatures and predictable behavior of the entire system.

Specifications and technical data

• SKU: A0005768V009
• Mark: Smart
• Condition: Used
• OEM Part Number: A0005768V009
• Substitutable numbers: A0005768V009, 0005768V009, 000 5768 V009, A4505010003, A 450 501 00 03
• Part type: Coolant Expansion Tank
• Category: Expansion & Overflow Tanks

Purpose and function in the cooling system

The presented expansion tank has been designed specifically for Smart C450 series models as a cooling system component responsible for monitoring coolant pressure and levels. Its task is to take in excess fluid during temperature increases and allow it to return to the circuit after cooling, which reduces the risk of engine overheating and leaks in the hoses. Thanks to a design compliant with the manufacturer's standards, the tank works with factory hoses, connectors, and mounts, facilitating installation without the need for modifications. This is a particularly beneficial solution for vehicle servicing where maintaining the original geometry of the cooling system is essential.

Original origin and compatibility

As a Smart brand part, the expansion tank is an OEM-class component, which means full compatibility with the vehicle's factory specifications. The design, shape, and placement of connections are consistent with the solutions used by the manufacturer, which minimizes the risk of installation problems and leaks after replacement. The presence of a dedicated part number and associated interchangeable numbers (visible in the specification section) facilitates verification of compatibility with specific engine versions and model years. This is particularly important when selecting cooling system components, where even minor design differences can affect tightness and durability.

Condition, functional advantages, and service application

The item is offered in a used condition, making it an attractive alternative to new replacements while maintaining original build quality. This type of component is suitable both for standard repairs following tank failure (cracks, leaks, worn connectors) and for preventive replacement during major cooling system servicing. The main benefits of using this tank include:

• factory fitment for the Smart C450 cooling system,
• preservation of original mount and connection geometry,
• suitability for professional service repairs,
• optimal cost-to-quality ratio thanks to its used, original origin.

Support with selection and cooling system expansion

If you are planning a comprehensive repair or upgrade of the engine area in your Smart and need other elements from the same group, such as additional tanks, venting elements, or supplementary cooling system components, check the available parts in the Smart Expansion tanks category. To better understand why original, used OEM components are increasingly chosen for servicing premium segment cars and related city vehicle designs, it is worth reading the article: Crisis in the new parts market? Why used originals for premium cars are the hottest trend in 2026.

Summary

Smart C450 Radiator Expansion Overflow Reservoir Tank Bottle is a practical solution for users and workshops that prioritize original cooling system components. The used OEM element allows for restoring proper system operation, reducing the risk of engine overheating, and maintaining the structural integrity of the vehicle, which is important for both reliability and the future resale value of the car.