Mercedes-Benz M-Class ML W163 Auxiliary Coolant Water Pump A0018356064

Mercedes-Benz M-Class ML W163 Auxiliary Coolant Water Pump is an original cooling system component designed for installation in the rear part of the vehicle. It ensures a stable circulation of coolant in the rear heating system area, which results in more uniform cabin heating and predictable engine operating conditions. Thanks to its factory origin from the Mercedes brand, the proper flow characteristics and compatibility with the vehicle's installation are maintained.

Specifications and technical data

• SKU: A0018356064
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0018356064
• Substitutable numbers: A0018356064, A 001 835 60 64
• Location on the vehicle: Rear
• Category: Other Air Conditioning & Heating

Purpose and function in the cooling system

The auxiliary coolant water pump in the W163 model is responsible for supporting the main coolant pump in the rear part of the vehicle. It maintains the flow of the medium through the lines leading to the rear heater, which is particularly important under higher thermal loads or during idling.

Its placement in the rear area of the vehicle allows for:

• more stable supply of coolant to the rear heater,
• reduction of temperature drops in the further sections of the system,
• better control over the thermal comfort of passengers in the rear of the cabin.

Benefits of using the original pump

Using the original auxiliary coolant water pump in the Mercedes W163 allows for maintaining the factory operating characteristics of the cooling system. This component is designed for the appropriate pressure and flow efficiency, which minimizes the risk of local overheating and uneven interior heating.

Key advantages include:

• Full integration with the vehicle's installation – matched ports, correct flow direction, and compatibility with factory mounts.
• Stable operation in the rear part of the system – optimized for the length of the lines and flow resistance in the W163 model.
• The ability to restore the proper operation of the rear cabin heating without interfering with the system's construction.

Installation and operational characteristics

The auxiliary coolant water pump intended for the Mercedes W163 is a component that is installed in the rear part of the vehicle in accordance with the factory line layout. Thanks to the preservation of the original body geometry and connections, it is possible to recreate the original installation path without the need for modifications.

In practice, this means:

• easier identification of the correct installation direction,
• reduction of time required for replacement compared to replacements with a different design,
• maintaining proper cooling system bleeding after installation.

Application in service and diagnostics

In the case of symptoms such as weaker heating in the rear of the cabin, uneven airflow temperature, or disturbances in fluid flow in the rear area, replacing the auxiliary coolant water pump is one of the basic service steps. Using an original component allows for reliable verification of other system components, as it eliminates variables resulting from improperly selected replacements.

For those considering broader modifications or comparing solutions used in different brands and sports versions, an article discussing design differences in drivetrains and braking systems may be helpful – details can be found in the material Audi RS vs other models – what is hidden under the hood and chassis?.

Selection of used parts and additional information

As a secondary market item, the water pump for the Mercedes W163 allows for an economical restoration of the cooling system's efficiency while maintaining the original specification. When choosing a used component, it is worth paying attention to the condition of the housing, ports, and electrical connectors to avoid leaks and power supply problems.

If you want to deepen your knowledge on the safe selection of secondary market elements and avoid common mistakes when purchasing, check out the guide Buying used car parts – the most common mistakes when choosing tuning parts, which discusses practical aspects of assessing the condition and cost-effectiveness of such components.

If you are planning a comprehensive repair or modernization of the cooling and heating area in your Mercedes and need other elements from the same group, such as coolant hoses, control valves, or additional flow-assisting modules, check the available parts in the category Other Mercedes.