Mercedes W164 Coolant Radiator M251 Petrol Engine Cooling Unit A2515000503

Mercedes W164 Coolant Radiator for Petrol Engine is an original cooling system component designed for rear-end installation in the vehicle. It ensures stable heat dissipation from the engine unit, which translates to a safe engine operating temperature and reduced risk of overheating. This is the solution for users expecting factory fitment and proven design in Mercedes cars with a petrol engine.

Specifications and technical data

• SKU: A2515000503
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2515000503
• Substitutable numbers: A2515000503, A 251 500 05 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 dedicated to Mercedes W164 SUV models with a petrol engine. Its task is to efficiently dissipate heat from the coolant circulating between the engine and the heat exchanger, stabilizing the engine unit's operating temperature under various load conditions.

Its placement at the rear of the vehicle allows it to work in conjunction with other cooling system components, such as hoses, the water pump, or the expansion tank, creating a cohesive and efficient system. This ensures the petrol engine maintains operating parameters in line with the manufacturer's specifications, contributing to component durability and reducing the risk of thermal failures.

Construction and Fitment for Petrol Engines

The radiator has been specifically designed to meet the requirements of Mercedes petrol engines, where rapid heat dissipation at varying RPMs and loads is crucial. The heat exchanger's construction is optimized for coolant flow and airflow, improving cooling efficiency in typical driving conditions and under heavier loads.

The original origin of the component means that the geometry of the connections, mounting points, and dimensions are in accordance with Mercedes' factory specifications. This facilitates installation in the W164 vehicle without the need for modifications, and also ensures proper cooperation with the cooling system and bodywork accessories.

Condition, Application, and Benefits of Installation

This is a used part, which in practice means the possibility of an economical repair of the cooling system while maintaining the manufacturer's original design. For many Mercedes W164 owners, this is a sensible compromise between cost and quality, especially for vehicles used daily.

Radiator replacement is recommended in situations such as:

• coolant leaks from the housing or connections,
• visible mechanical damage to the core or spigots,
• reduced cooling performance indicated by rising engine temperature,
• internal corrosion or contamination restricting fluid flow.

Choosing an original water radiator for a specific petrol engine version allows for maintaining stable engine unit operation, improving driving comfort, and reducing the risk of costly repairs related to overheating.

Technical Support and Related Content

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as additional heat exchangers, coolant hoses, or expansion tanks, check the available parts in the Mercedes Water Radiators category.

To better understand the symptoms of overheating, common faults, and best service practices for radiator replacement, it is worth reading the guide on our blog: Engine Cooling System – Overheating, Repair, and Used Radiators. You will find practical tips on diagnosing and operating cooling systems in modern cars there.

For those who consciously choose used components and want to better understand their impact on the environment and car maintenance costs, we also recommend the article: Circular Economy in Your Garage – How Choosing Used Dismantled Parts Truly Supports Environmental Protection and Your Wallet?. This is a good supplement to your knowledge when planning repairs using dismantled parts.