Gearbox Cooler Mercedes W164 W251 Oil Transmission Cooling Radiator A1645002500

Gearbox Cooler Mercedes W164 W251 Oil Transmission Cooling Radiator is a component from the Oil coolers and lines group, designed to stabilize transmission oil temperature in Mercedes SUV and VAN class vehicles. A properly selected oil cooler reduces the risk of transmission overheating, which translates into smoother drivetrain operation and longer component service life. This used OEM component is a sensible choice for drivers looking for a technically verified solution at an attractive price.

Specifications and technical data

• SKU: A1645002500
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1645002500
• Substitutable numbers: A1645002500, A 164 500 25 00
• Category: Oil Coolers & Lines

Function and application of the gearbox oil cooler

The gearbox oil cooler in Mercedes W164 and W251 models is responsible for dissipating excess heat from the transmission fluid, keeping its parameters within a stable operating range. A properly functioning oil cooling system:

• limits the drop in oil viscosity at high temperatures,
• reduces wear on friction elements in the gearbox,
• supports smooth gear shifting in both city and highway conditions,
• reduces the risk of failures associated with automatic transmission overheating.

For Mercedes W164 and W251 class vehicles, which often operate under higher loads (family trips, towing, driving with a full load), an efficient gearbox oil cooler is of particular importance for the durability of the entire drivetrain.

Benefits of using an original Mercedes oil cooler

Choosing an original gearbox oil cooler for a Mercedes ensures precise fitment to the factory cooling system. The OEM design is engineered for specific models, ensuring that:

• the proper heat exchange efficiency is maintained under typical operating conditions for these vehicles,
• mounting points and oil connections are compatible with the factory installation,
• the risk of leaks resulting from component mismatch is minimized.

A used OEM component allows for maintaining the structural integrity of the drivetrain, which is essential when servicing automatic transmissions in premium-class Mercedes vehicles.

Condition, verification, and preparation for installation

The offered gearbox oil cooler is in Used condition, meaning it has been removed from a vehicle and verified for further serviceability. This type of component is particularly attractive to users who:

• are looking for a compromise between repair costs and part quality,
• want to maintain the original cooling system specifications,
• are planning a gearbox service combined with an oil change and related components.

Before installation, a standard service procedure is recommended: checking the system for leaks, inspecting the condition of oil lines, and properly bleeding the system after filling it with fresh transmission oil in accordance with the vehicle manufacturer's recommendations.

Technical support and additional information

To better understand the impact of an efficient cooling system on the service life of the engine and gearbox, it is worth reading the guide on overheating and cooling system diagnostics – this is discussed in detail in the article Engine cooling system – overheating, repair, and used radiators, where you will find practical tips on operating oil coolers in premium-class vehicles.

If you are planning a comprehensive repair or upgrade of the drivetrain area in your Mercedes and need other elements from the same group, such as additional oil coolers, oil lines, or mounting hardware, check the available parts in the Mercedes oil coolers and lines category.