Mercedes W177 A 35 Coolant Overflow Expansion Tank Bottle Petrol A2602001300

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W177 A 35 Coolant Overflow Expansion Tank Bottle is an original cooling system component designed for compact Mercedes models with petrol engines. This used, fully functional tank ensures stable operating conditions for the power unit, supporting the maintenance of the correct engine temperature and the safe discharge of excess fluid. Thanks to its factory OEM design, it provides a precisely fitted service solution.

Specifications and technical data

• SKU: A2602001300-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2602001300
• Substitutable numbers: A2602001300, A 260 200 13 00
• Fuel type: Petrol
• Category: Expansion & Overflow Tanks

Purpose and role in the cooling system

The expansion tank in the version used in the latest generation of Mercedes A-Class and B-Class models is responsible for compensating for changes in coolant volume and stabilizing pressure in the system. In practice, this means:

• safe collection of excess fluid during engine warm-up,
• return of fluid to the circuit when the temperature drops,
• the ability to visually check the coolant level,
• maintaining the tightness and proper pressure in the cooling system.

In vehicles with a petrol engine, a properly functioning expansion tank is crucial for protecting the power unit against overheating and local temperature spikes.

Construction and fitment for Mercedes W177 / W247

The presented element has been designed specifically for compact Mercedes models, which translates into an exact fit with factory mounts and proper routing of coolant hoses. The tank's construction includes:

• a shape adapted to the engine bay of W177 and W247 models,
• hose connections compatible with the A 35 cooling system,
• a space for the pressure cap and venting ports,
• a housing adapted for operation at elevated temperatures.

Thanks to this, installation is straightforward, without the need to modify the cooling system or fabricate additional brackets.

Benefits of using an original expansion tank

Choosing an original expansion tank for a Mercedes brings a number of practical service and operational benefits:

• Factory geometry and capacity – the cooling system operates under the conditions intended by the manufacturer, which promotes a stable engine operating temperature.
• Compatibility with petrol engine accessories – the tank is adapted to the thermal characteristics of petrol-powered units.
• Easier diagnostics – the transparent construction allows for a quick check of the fluid level and any potential leaks.
• Consistency with other cooling system components – no issues with fitting hoses, clamps, and mounts.

A used, original part is a sensible choice for post-accident repairs, mechanical damage to the tank, or wear and tear.

Condition, installation, and service recommendations

The offered expansion tank comes from disassembly and is intended for reinstallation after standard workshop verification. Before installation, it is recommended to:

• check the tightness of the body and ports,
• inspect the pressure cap seat,
• thoroughly flush the interior of the tank,
• use new clamps on the coolant hoses.

An element prepared in this way allows for the restoration of proper cooling system operation without the need to interfere with other components.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as additional tanks, mounting elements, or related cooling system components, check the available parts in the Mercedes expansion tanks category.

For drivers considering a wider range of service work on consumable parts, it is worth reading the guide on choosing used suspension components – you will find practical tips and examples in the article Stock vs. sports suspension – design differences and is it worth buying used suspension parts?.