Mercedes-Benz A B Class W169 W245 Coolant Expansion Tank Bottle A1695000049

The Mercedes-Benz A/B‑Class W169/W245 Coolant Expansion Tank is an original cooling system component designed for the brand's compact models. Thanks to its factory design, it ensures proper cooling system operation and stable fluid level maintenance, which translates to safe engine operation. This is a solution for users looking for a proven OEM component instead of replacements with uncertain parameters.

Specifications and technical data

• SKU: rhd-A1695000049
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1695000049
• Substitutable numbers: A1695000049, A 1695000049, A 169 500 00 49, EM
• Category: Caps

Purpose and Function in the Cooling System

The offered expansion tank is a cooling system component responsible for compensating for fluid volume changes during engine heating and cooling. A correctly selected tank allows for:

• maintaining stable pressure in the cooling system,
• providing a coolant reserve,
• minimizing the risk of engine overheating,
• facilitating fluid level checks thanks to the transparent body design.

By matching the specific generation of the A‑Class and B‑Class, the tank works with factory equipment, hoses, and mountings, reducing the need for assembly modifications.

Original Origin and Fit for Mercedes-Benz

As part of the Covers group in the manufacturer's offering, the tank has been designed according to Mercedes-Benz quality standards. This means maintaining the correct geometry of the spigots, mounting points, and housing shape, which translates to:

• secure fit with factory brackets in the engine bay,
• proper routing of coolant hoses,
• compatibility with original caps and cooling system equipment.

Such a fit is particularly important in modern engine bays where space is limited and each component has a precisely defined place.

Performance Characteristics and Benefits of Installation

Choosing an original expansion tank for the A‑Class W169 or B‑Class W245 allows for maintaining the factory operating parameters of the cooling system. Key benefits include:

• stable cooling system operation due to the correct capacity and design of the working chamber,
• easy fluid level checks – design intended for standard MIN/MAX markings,
• compatibility with original sensors and hoses (where present in a given configuration),
• reduced risk of leaks resulting from imprecise fit of aftermarket parts.

This type of component is particularly important in vehicles used in urban traffic, where frequent engine heating and cooling intensely load the cooling system.

Part Condition and Service Application

The offered tank is a used part, allowing for economical repair of the cooling system while maintaining original quality of workmanship. This type of component is suitable for both typical replacement of a worn or damaged tank and for comprehensive service work related to the cooling system in Mercedes-Benz A/B‑Class vehicles.

Before installation, standard checks of tightness and the condition of spigots and mountings are recommended, as well as replacement of coolant according to the vehicle manufacturer's recommendations.

If you are planning a comprehensive repair or upgrade of the engine bay area in your Mercedes and need other parts from the same group, such as covers, trim pieces, or additional mounting elements, check the available parts in the Mercedes Covers category.

To further verify part compatibility with your car using OEM numbers and avoid mistakes when selecting components, it is worth using the practical tips contained in the article Risk-Free Online Parts Shopping – 5 Proven Ways to Verify Component Compatibility.