Mercedes W204 W207 Radiator Water Coolant Vent Hose Pipe Line A2045012325

Mercedes W204 W207 Radiator Water Coolant Vent Hose Pipe Line is an original component from the Lines, hoses and pipes group, designed for operation in the coolant circuit. It ensures stable air discharge from the system, which promotes even radiator operation and maintains the proper engine temperature. The used OEM component is a sensible choice when servicing the cooling system in mid-range Mercedes vehicles.

Specifications and technical data

• SKU: A2045012325
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2045012325
• Substitutable numbers: A2045012325, A 204 501 23 25
• Category: Hoses, Lines & Pipes

Purpose and function in the cooling system

The offered vent hose is a component of the system transporting coolant between the radiator and other engine components. Its task is the controlled discharge of air bubbles from the circuit, which reduces the risk of local overheating and improves the stability of the thermostat and coolant pump operation.

A properly selected hose in this section of the cooling system helps to:

• maintain an even flow of coolant,
• minimize the risk of air locks in the circuit,
• preserve the factory operating parameters of the power unit.

Construction and fitment for Mercedes W204 / W207

The hose has been designed specifically for Mercedes C-Class (W204) and E-Class coupe/cabrio (W207) models, maintaining the factory routing geometry in the engine compartment. The properly formed hose line facilitates installation in the original brackets and guides, which limits stress and reduces the risk of chafing during operation.

Original manufacturing ensures:

• compatibility with factory cooling system connectors and fittings,
• stable positioning relative to the radiator and other components,
• preservation of the flow capacity and operating diameter intended by the manufacturer.

Characteristics of the used component

The item comes from dismantling and is offered as a used cooling system hose. This type of part is particularly attractive for repairs where maintaining the original manufacturer's specification while reducing service costs is key. The used OEM component allows for maintaining system consistency without the need to use replacements with uncertain parameters.

Before installation, a standard visual inspection of the hose for any signs of operational wear is recommended, in accordance with service procedures used in workshops servicing Mercedes vehicles.

Benefits of using an original hose

Using an original vent hose in the cooling system brings measurable service and operational benefits:

• Factory fitment – the hose is designed for specific models, which facilitates installation and reduces the risk of leaks.
• Consistency with other system elements – maintaining the original diameter and shape supports proper coolant circulation.
• Predictable operational behavior – operating parameters correspond to the vehicle manufacturer's assumptions.

Such a solution is particularly beneficial for comprehensive service work, where repeatability and compliance with the manufacturer's technical documentation are important.

Service expansion and related elements

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as additional coolant lines, return hoses, or pipes connecting the radiator to the engine, check the available parts in the Mercedes lines, hoses and pipes category.

When planning broader service work, it is also worth checking the guide on selecting used components, their durability, and their impact on vehicle performance characteristics – you will find practical tips in the article Standard vs. sports suspension – construction differences and is it worth buying used suspension parts?, which discusses the approach to used parts in the context of safety and cost-effectiveness.