Expansion Tank Mercedes W164 Coolant Reservoir Cap Bottle A1645000049

Visual condition of the part

The product shows signs of use visible in the photos.

Expansion Tank Mercedes W164 Coolant Reservoir Cap Bottle is an original cooling system component, designed specifically for the W164 series models. A used expansion tank of this class ensures stable engine operating conditions by maintaining the correct coolant level and supporting the safe operation of the vehicle. This is a solution for drivers looking for factory fitment and a proven design at a reasonable price.

Specifications and technical data

• SKU: A1645000049-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1645000049
• Substitutable numbers: A1645000049, A 164 500 00 49
• Category: Expansion & Overflow Tanks

Purpose and function in the cooling system

The expansion tank in the Mercedes W164 is responsible for compensating for changes in coolant volume during engine heating and cooling. A properly selected component allows for maintaining stable pressure in the system, reduces the risk of overheating, and facilitates coolant level checks during daily maintenance.

The original design dedicated to this generation of Mercedes guarantees proper hose connection, correct routing of the cooling medium, and compatibility with factory mounts in the engine bay. As a result, installation is predictable, without the need for system modifications.

Construction and fitment for the Mercedes W164

The presented expansion tank belongs to the Expansion tanks category and has been designed with the specific cooling system of the Mercedes W164 in mind. The shape of the housing, the placement of the ports, and the mounting points are adapted to the factory layout of components in the engine bay, which facilitates correct hose routing and maintaining the required clearances from other components.

A used component of this type is a good choice for maintenance repairs when the existing tank shows signs of wear, such as micro-cracks, deformations, or leaks. Replacing it with an original tank allows for restoring the proper operation of the cooling system without interfering with its construction.

Benefits of using an original tank

Choosing an original expansion tank for the Mercedes W164 brings a number of practical advantages:

• factory fitment to the cooling system of a specific vehicle generation,
• preservation of the coolant circulation intended by the manufacturer,
• proper interaction with other system components,
• no need for adapting mounts or hoses.

Thanks to this, it is possible to effectively reduce the risk of leaks, venting problems, and improper engine operation resulting from incorrect pressure in the cooling system. Using parts consistent with the manufacturer's design also helps maintain stable engine performance parameters in the long term.

Product condition and service application

The offered expansion tank is a used item, which makes it an attractive cost-effective alternative while maintaining the original specification. This type of part will work well both for current maintenance repairs and for comprehensive cooling system service when several components need to be replaced at the same time.

In practice, installation involves removing the old tank, transferring the hoses, and properly venting the system after refilling the coolant. It is worth entrusting this operation to a workshop that knows the specifics of the Mercedes W164 construction to fully utilize the potential of the installed component.

Complementary Mercedes Expansion tanks

If you are planning a comprehensive repair or upgrade of the cooling system area in your Mercedes and need other elements from the same group, such as additional tanks, mounting elements, or caps, check the available parts in the Mercedes Expansion tanks category.

Part selection by numbers and service practice

When selecting an expansion tank for the Mercedes W164, it is crucial to compare the part's identification data with the vehicle documentation and manufacturer information. Proper fitment allows avoiding installation problems and guarantees compliance with cooling system parameters.

For users interested in a broader look at the topic of selecting original used components, identification procedures by numbers, and the impact of such solutions on car durability, an article describing the practical aspects of using factory parts in premium class vehicles may be helpful, available at the link: BMW – sports performance and precision. How do original used parts extend the life of a Bavarian icon?.