Mercedes-Benz C CLK Class W203 C09 Auxiliary Water Heater Pump A2038350064

Mercedes-Benz C CLK Class W203 C09 Auxiliary Water Heater Pump is a cooling system component responsible for stable fluid flow in the rear section of the vehicle. Thanks to its precise fit for the W203 generation C and CLK Class models, it ensures consistent thermal system operation and proper compatibility with factory Mercedes components. This solution is intended for users who expect a reliable, OEM-compliant design without the need for installation modifications.

Specifications and technical data

• SKU: A2038350064
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2038350064
• Substitutable numbers: A2038350064, A 203 835 00 64, EM
• Location on the vehicle: Rear
• Category: Water Pumps

Purpose and function in the cooling system

The described pump belongs to the Water pumps category and operates in the rear part of the vehicle, supporting the main coolant circuit. Its task is to maintain proper medium flow in situations where the standard engine pump cannot ensure optimal circulation, for example, under increased thermal load or during the operation of additional heat consumers.

Such a solution is particularly important in premium class cars, where a stable operating temperature affects not only the durability of the power unit but also user comfort and the proper functioning of related systems.

Compatibility with Mercedes-Benz C and CLK Class W203

The pump has been designed with the architecture of the W203 generation Mercedes C and CLK Class in mind, which translates into:

• maintaining factory mounting geometry in the rear of the vehicle,
• correct connection to existing cooling system hoses,
• consistent cooperation with original controllers and temperature sensors.

As a result, the installation process is similar to a factory service replacement, without the need for mounting adaptations or wiring modifications.

Performance characteristics and application benefits

Using an auxiliary water pump in the cooling system of a Mercedes C/CLK W203 allows for more even heat distribution throughout the entire circuit. In practice, this means:

• more stable engine operating conditions during prolonged loads,
• better temperature control in the rear part of the system,
• reduced risk of local overheating of cooperating components.

For the user, this translates into more predictable vehicle behavior and the ability to maintain performance parameters close to factory specifications, which is particularly important in cars used intensively or on long journeys.

Component condition and installation aspects

The offered pump is a used item, which in practice means it comes from vehicle dismantling and may show typical signs of wear while maintaining the functionality required for further use. For a mechanic or workshop, it is important that we are dealing with a part originating from a Mercedes, which facilitates identification and selection for a specific car configuration.

During replacement, standard service procedures are recommended: checking the condition of hoses, connection tightness, and bleeding the cooling system after installation. This allows for full utilization of the pump's potential and reduces the risk of subsequent leaks.

Expanding the cooling system in a Mercedes

If you are planning a comprehensive repair or upgrade of the cooling system area in your Mercedes and need other components from the same group, such as auxiliary pumps, circulation modules, or flow-assisting elements, check the available parts in the Mercedes Water pumps category.

For an even better understanding of the relationships between pumps, fluid circulation, and engine power supply, it is worth familiarizing yourself with practical tips regarding diagnostics and component selection by OEM numbers, which you will find in the article "Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration". This will allow you to view the vehicle as a coherent system, in which the cooling and fuel systems mutually influence the durability of the power unit.