Mercedes R171 W203 Coolant Radiator Petrol Engine Cooling Unit A2035003403

Mercedes R171 W203 Coolant Radiator Petrol Engine Cooling Unit is an original cooling system component designed for petrol engine vehicles, engineered for stable heat dissipation from the power unit. Thanks to its factory design, the radiator ensures predictable operating parameters, and its precise fit for the specific Mercedes platform facilitates installation and subsequent operation. This is a solution for users looking for a proven cooling component rather than universal replacements.

Specifications and technical data

• SKU: A2035003403
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2035003403
• Substitutable numbers: A2035003403, A 203 500 34 03, A1715000203, A 171 500 02 03
• Location on the vehicle: Rear
• Fuel type: Petrol
• Category: Radiators

Purpose and function in the cooling system

The presented radiator belongs to the Water Radiators category and is responsible for efficient heat exchange between the coolant and the environment. In Mercedes R171 and W203 series vehicles, this component works with other cooling system parts, stabilizing the operating temperature of the petrol engine across a wide range of loads.

Its placement in the rear of the vehicle implies specific routing of cooling hoses and different airflow conditions compared to a classic front-mounted system. In practice, this translates into:

• more even weight distribution in the vehicle,
• different cooling characteristics at higher speeds,
• the necessity of using a radiator with appropriately selected geometry and capacity.

Benefits of using an original Mercedes radiator

The original water radiator dedicated to Mercedes provides a number of practical advantages in daily operation:

• Factory fit – maintaining the correct mounting position, attachment points, and cooling system connections.
• Stable operation in a petrol engine – design adapted to the thermal characteristics of power units of this generation.
• Predictable fluid flow parameters – essential for operation in high ambient temperatures and city traffic.
• Compatibility with cooling system accessories – hoses, expansion tanks, sensors, and fans.

As a result, the radiator helps reduce the risk of engine overheating, which has a direct impact on the durability of the power unit and driving comfort.

Technical characteristics and installation

The radiator has been designed specifically for the Mercedes platform, which facilitates installation at original mounting points without the need for structural modifications. The connection layout is adapted to the factory routing of cooling hoses in the rear of the vehicle, which minimizes the risk of leaks and simplifies maintenance.

The product has an assigned OEM part number and interchangeable numbers, which allows for precise verification of compatibility with a specific vehicle configuration. This is particularly important when selecting components for different engine versions within the same model series.

Application in petrol vehicles

The cooling system in Mercedes petrol engines requires components with appropriately selected thermal efficiency. The presented radiator has been constructed to operate under such conditions, ensuring:

• stable operating temperature during dynamic driving,
• adequate capacity reserve under high loads,
• consistency with the factory engine temperature control strategy.

Thanks to this, it is a safe choice for users expecting predictable operation of the cooling system in daily use and during longer trips.

Condition and compatibility verification

The item comes from a used vehicle, which is an attractive cost alternative to new parts while maintaining the original design. Before purchasing, it is recommended to compare the OEM part number and interchangeable numbers with the vehicle documentation or the existing radiator to confirm full installation compatibility.

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

Technical support and additional knowledge

To better understand how high summer temperatures affect the efficiency of the cooling system and when it is worth reaching for used components, read our guide: Summer heat vs. cooling system: used radiators and fans as a guarantee of savings. It is a practical source of knowledge that will help you assess the condition of your current system and plan any necessary component replacement.