Mercedes R171 W203 Engine Cooling Radiator Coolant Unit 3.0 Petrol A2035004803

Mercedes R171 W203 Engine Cooling Radiator Coolant Unit is an original cooling system component, specifically designed for petrol engines. This used OEM part ensures proper heat dissipation from the engine, stabilizing operating temperatures and supporting the trouble-free operation of the vehicle. It is a practical solution for drivers looking for a proven component at a reasonable price.

Specifications and technical data

• SKU: A2035004803
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2035004803
• Substitutable numbers: A2035004803, A 203 500 48 03
• Fuel type: Petrol
• Part type: Radiator
• Category: Radiators

Purpose and function in the cooling system

The presented water radiator operates within the coolant circuit, absorbing excess heat from the engine and releasing it into the environment. For 3.0 petrol engines in Mercedes R171 and W203 models, a correctly selected radiator is crucial for:

• maintaining a stable engine operating temperature under load,
• reducing the risk of overheating in both city and highway driving conditions,
• increasing the durability of seals, the cylinder head, and engine accessories,
• maintaining the proper efficiency of the lubrication and combustion systems. Thanks to a design tailored to the specific configuration of the petrol engine, the radiator works seamlessly with the factory fan, hoses, and sensors, which facilitates installation and subsequent maintenance.

Benefits of using an original Mercedes water radiator

The original water radiator from the Water Radiators group ensures compliance with factory flow and thermal efficiency parameters. In practice, this means:

• a perfect fit for the front frame and mounting points in Mercedes R171 and W203 models,
• proper compatibility with the 3.0 petrol engine cooling system,
• preservation of the cooling characteristics designed by the manufacturer across the entire RPM range. A used OEM part is also an economical solution for drivers who want to restore the efficiency of the cooling system without compromising on original build quality and fitment.

Condition, installation, and practical application

The item comes from disassembly and is offered as a used part, which allows for reduced repair costs while maintaining factory specifications. The radiator is designed to work with a petrol engine, so its construction and flow parameters are adapted to the thermal characteristics of the 3.0 unit. Replacing the water radiator is particularly recommended when symptoms such as the following appear:

• coolant leaks from the front of the vehicle,
• frequent fluctuations in engine temperature,
• signs of corrosion or mechanical damage on the radiator core. Using an original component helps restore proper coolant circulation and reduces the risk of costly failures resulting from engine overheating.

Technical support and additional information

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 radiator cores, expansion tanks, or cooling modules, check the available parts in the Mercedes Water Radiators category. To better understand how high temperatures affect the cooling system and when it is worth choosing used radiators and fans, read our guide Summer heat vs. cooling system: used radiators and fans as a guarantee of savings. If you want to learn more about the advantages of using original, used OEM components in the context of safety and repair durability, the following article will be helpful: Quality assurance and OEM safety – why are used original car parts the best choice for your car?.