Mercedes W164 OM642 Diesel Heater Matrix Water Coolant Hose A1645003075

Mercedes W164 OM642 Diesel Heater Matrix Water Coolant Hose is an original cooling system component designed for diesel-powered vehicles. The part has been specifically engineered for operation in the rear area of the vehicle, ensuring stable coolant flow and proper circulation within the system. Thanks to its factory origin and precise geometry, it provides a safe service solution for repairs and upgrades of the cooling system in Mercedes W164 class vehicles with the OM642 engine.

Specifications and technical data

• SKU: A1645003075
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1645003075
• Substitutable numbers: A1645003075, A 164 500 30 75
• Location on the vehicle: Rear
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and function in the cooling system

The presented water hose is responsible for stable coolant flow in the rear part of the vehicle, which is crucial for maintaining the correct operating temperature of the diesel engine. The design, matched to the architecture of the Mercedes W164 with the OM642 unit, minimizes the risk of stress, leaks, and interference with other components.

The element belongs to the technical group Hoses, pipes and lines, which means it has been designed for resistance to temperature fluctuations, pressure, and typical operational loads in diesel engine cooling systems.

Compatibility with the OM642 diesel engine

The OM642 engine is a popular Mercedes diesel unit where the cooling system operates under significant thermal load. Using a dedicated water hose in the rear part of the vehicle:

• supports the maintenance of a stable engine operating temperature,
• reduces the risk of overheating during long-distance highway driving,
• ensures proper coolant flow in an area critical to the durability of the power unit.

Thanks to its adaptation to the specific fuel type – Diesel – the hose is prepared for operation in conditions characteristic of diesel engines, including higher thermal loads and high mileage.

Vehicle placement and installation aspects

The hose is designed for installation in the rear part of the vehicle, which requires precise routing relative to suspension, body, and exhaust system components. Proper shaping and mounting points facilitate correct positioning of the hose during installation and service.

In workshop practice, using an original Mercedes component limits the need for modifications, adjustments, or the use of additional clamps. This translates into:

• shorter installation time,
• lower risk of leaks,
• preservation of the factory cooling system geometry.

Characteristics of the used OEM part

The offered water hose is an original Mercedes brand part in used condition, which in practice represents a real cost-effective alternative to new components while maintaining the factory design. For many users and workshops, this is a sensible choice for maintenance repairs, especially in vehicles with higher mileage.

A used OEM element allows for maintaining the consistency of the cooling system with other components while reducing service costs. In the case of extensive repairs, it is also worth considering other cooling system elements available in the Hoses, pipes and lines section to comprehensively refresh the entire fluid circuit.

Why choose this water hose for your Mercedes W164

Choosing a dedicated water hose for the Mercedes W164 with the OM642 engine primarily means certainty of fitment and the preservation of proper cooling system operation. The original geometry, correct diameters, and adaptation to diesel engine operation ensure that the part performs well both in daily use and under higher loads.

If you are planning a wider range of service work or vehicle modernization, it is also worth checking out the technical guide on selecting used suspension components and related parts: see the comparison of stock and sport suspension and tips on used parts. This will allow you to better plan the scope of repairs and select parts in a way that is consistent with the character of your Mercedes.