Mercedes W204 C207 S212 Transmission Oil Cooler Hose Line Left N/S A2042703796

Mercedes W204 C207 S212 Transmission Oil Cooler Hose Line Left N/S is an original drivetrain component designed for the precise routing of transmission oil through the cooler. Thanks to its factory geometry and perfect fit for the specific Mercedes platform, it ensures stable thermal operating conditions for the transmission and reduces the risk of leaks in the critical left-hand section of the vehicle. This is a practical solution for users who want to maintain the integrity of the oil cooling system according to the manufacturer's original specifications.

Specifications and technical data

• SKU: A2042703796
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2042703796
• Substitutable numbers: A2042703796, A 204 270 37 96
• Location on the vehicle: Left
• Part type: Oil Cooler Line
• Category: Oil Coolers & Lines

Purpose and technical function

The hose belongs to the Oil coolers and hoses category and is responsible for transporting transmission oil between the gearbox housing and the heat exchanger. In the Mercedes C-Class and E-Class models for which it is intended, it is responsible for:

• maintaining a stable transmission oil temperature during city and highway driving,
• ensuring proper flow of the operating medium through the oil cooler,
• reducing pressure drops in the system thanks to its matched diameter and shape,
• secure routing of the hose in the left zone of the engine bay and chassis.

The left-side placement allows for the correct routing of the oil line in accordance with the factory layout, which minimizes stress, the risk of abrasion, and collisions with other components.

Compatibility with the Mercedes platform

The hose has been designed for the construction of Mercedes models from the W204, C207, and S212 families, where the transmission oil cooling system is an integral part of the entire drivetrain. The appropriate length, shape, and mounting points allow for:

• installation in existing brackets and guides without the need for modifications,
• maintaining the original hose routing in the engine bay and chassis,
• compatibility with the factory oil cooler and transmission connectors.

As a result, the hose acts as a cohesive element of the oil cooling system, which is essential for both the durability of the automatic transmission and the stability of the entire drivetrain's operating parameters.

Performance characteristics and installation

As an original Mercedes component, the hose maintains factory flow characteristics and resistance to operating conditions in the engine bay. In practice, this means:

• resistance to elevated oil and ambient temperatures,
• suitability for high-pressure operation within the transmission system,
• compatibility with factory quick-connectors or threaded fittings (depending on the specific vehicle configuration),
• easier diagnostics and future service thanks to the preservation of the original hose routing.

The left-side placement facilitates mechanic access during replacement or service, especially when working on the oil cooler, hoses, and transmission components.

Product condition and service application

The offered hose comes from the used parts group, which allows for cost-effective repair of the transmission oil cooling system while maintaining the manufacturer's original specifications. This type of component is particularly useful in situations where:

• mechanical damage to the existing hose has occurred (abrasion, cracking, external corrosion),
• oil leaks are present around the hose connections to the cooler or transmission,
• comprehensive replacement of oil line components is necessary during a major transmission overhaul.

Using an original hose in place of a worn or leaking part helps restore proper oil circulation and reduces the risk of transmission overheating, which has a direct impact on its service life.

Technical support and additional materials

To better understand the impact of a functional cooling system on the durability of the drivetrain and transmission, it is worth checking out our guide on the diagnostics and operation of cooling systems – this is discussed in detail in the article Engine cooling system – overheating, repair, and used radiators, where you will find practical tips regarding oil coolers in premium class cars.

If you are planning a comprehensive repair or upgrade of the drivetrain and oil cooling area in your Mercedes and need other components from the same group, such as oil hoses, oil coolers, or additional return line sections, check out the available parts in the Mercedes oil coolers and hoses category.