Radiator Mercedes SLK R171 W203 CLK W209 Engine Water Cooling Unit A2035002503

Visual condition of the part

The product shows signs of use visible in the photos.

Radiator Mercedes SLK R171 W203 CLK W209 Engine Water Cooling Unit is an original cooling system component from the Water radiators group, designed for Mercedes compact and mid-size models. This used radiator ensures factory-fit, maintaining the correct coolant flow characteristics and stable heat dissipation from the engine unit. It is a solution for users who expect a proven design within a reasonable budget.

Specifications and technical data

• SKU: A2035004203-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2035004203
• Substitutable numbers: A2035004203, A 203 500 42 03, A2035002503, A 203 500 25 03
• Category: Radiators

Purpose and function in the cooling system

The presented engine radiator is a cooling system component responsible for efficiently transferring heat from the coolant to the surroundings. In Mercedes SLK R171, W203, and CLK W209 vehicles, its proper operation is crucial for maintaining a stable engine operating temperature, protecting against overheating, and reducing the risk of damage to the cylinder head, head gasket, or accessories.

Thanks to a design consistent with Mercedes factory standards, the radiator works with the original fan, hoses, and sensors, which facilitates installation and reduces the need for additional modifications. Maintaining proper cooling efficiency translates into stable engine operation, even heating, and correct operation of the interior heating system.

Benefits of using an original water radiator

Using an original water radiator in a Mercedes brings a number of practical technical benefits:

• factory fit for mounts and accessories in the engine bay,
• preservation of the heat exchange efficiency designed by the manufacturer,
• compatibility with the stock cooling system without the need for adaptation,
• consistency with engine operating parameters and the engine control unit.

For users who want to reduce the risk of engine overheating, choosing an original radiator from the Water radiators category is a reasonable compromise between cost and durability. The used OEM component retains the flow characteristics and heat exchange surface consistent with the vehicle manufacturer's design assumptions.

Condition, origin, and installation aspects

The radiator comes from a dismantled Mercedes vehicle, which allows for maintaining compliance with factory design solutions. The used component is a good choice in a situation where the existing radiator has developed leaks, deformation, or has lost efficiency due to years of operation.

Before installation, a standard service procedure is recommended: flushing the cooling system, checking the condition of hoses, clamps, and the thermostat, and using the appropriate coolant. A properly performed radiator replacement allows for restoring stable thermal operating conditions of the engine and reducing the risk of failures related to overheating.

Operation and maintenance of the cooling system

To maximize the potential of this radiator, it is worth taking care of regular maintenance of the entire cooling system: periodic fluid replacement, leak checks, fan condition, and cleanliness of the cooling fins. Conscious operation significantly extends the service life of both the radiator itself and the engine unit.

If you want to better understand the impact of a functional radiator on engine durability and the symptoms of overheating, check out the article Engine cooling system – overheating, repair, and used radiators, which discusses practical aspects of diagnostics and repair of cooling systems in popular models.

Expanding repairs within the cooling system

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 radiators, mounting elements, or related hoses, check the available parts in the Mercedes water radiators category.

When choosing between regeneration and installing a used OEM component, it is also worth familiarizing yourself with practical tips regarding the cost-effectiveness of both solutions, described in the guide Refurbished or used original – which part to choose for repair?. This will make it easier to match the repair strategy to the vehicle's condition and the planned period of further operation.