Coolant Vent Line Mercedes W204 W212 W205 Engine Radiator Pipe Hose A2740180300

Coolant Vent Line Mercedes W204 W212 W205 Engine Radiator Pipe Hose is an original engine system component designed for use in popular Mercedes C-Class and E-Class models. Thanks to its factory geometry and precisely matched connector diameters, it ensures stable discharge of vapors and gases from the power unit, which promotes smooth engine operation and reduces the risk of leaks. This is a practical solution for users looking for a proven dismantled part instead of unreliable replacements.

Specifications and technical data

• SKU: A2740180300
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2740180300
• Substitutable numbers: A2740180300, A 274 018 03 00
• Category: Hoses, Lines & Pipes

Purpose and function of the vent line

The presented vent line is designed for the vapor discharge system in engines used in Mercedes W204, W212, and W205 series. Its task is to provide controlled routing of gases from the engine compartment or crankcase ventilation system to the appropriate auxiliary components, which helps maintain proper pressure and reduces the phenomenon of blow-by.

A properly routed hose minimizes the risk of oil and vapor leaks, and also helps maintain cleanliness in the engine compartment. Proper operation of the ventilation system translates into stable idle speed, correct throttle response, and reduced deposits in the intake manifold.

Construction and fitment for Mercedes models

The line belongs to the group of components referred to as Lines, hoses, and pipes, which means it has been constructed to work in an environment of elevated temperatures and contact with oil vapors. The shape and length are adapted to factory routing in the engine compartment, so installation does not require any modifications or additional brackets.

The original ends of the line are prepared to work with factory connectors in Mercedes power units, which makes it easier to achieve tight connections. Such a solution reduces the risk of a drop in ventilation system efficiency and eliminates typical problems known from cheap replacements, such as cracking or deformation under the influence of temperature.

Characteristics of the used part

The item comes from dismantling, which means it is a used part, but it retains the functionality required for further operation. For many users, this is a reasonable compromise between cost and quality, especially in the case of original components whose new counterparts can be expensive or difficult to obtain.

Choosing a used vent line makes sense especially when you want to maintain consistency with the factory engine equipment and avoid fitment problems. A properly selected dismantled part allows you to restore the correct operation of the ventilation system without the need to interfere with the construction of the power unit.

Benefits of using an original line

Using an original vent line in a Mercedes W204, W212, or W205 brings a number of practical benefits:

• factory fitment to the engine system without the need for modifications,
• maintenance of the vapor flow path intended by the manufacturer,
• reduction of the risk of leaks and uncontrolled seepage,
• stable operation of the power unit in terms of ventilation,
• consistency with other engine auxiliary components.

For workshops and individual users, this means easier installation, a predictable repair result, and a lower risk of the ventilation system issue returning.

Application in service and diagnostics

A vent line of this type is often replaced when symptoms such as unstable idle, the smell of oil vapors in the engine compartment, visible oiling around the connectors, or errors related to the intake system operation occur. Replacing a worn or brittle hose with an original component often allows for a quick resolution of the problem without the need to interfere with more complex sub-assemblies.

If you are planning a wider range of work on engine systems and accessories, it is also worth checking out other items from the lines and hoses group available in the Lines, hoses, and pipes category, to restore full tightness and proper circulation of operating fluids and gases in one service stage.

Technical support and part selection

Selecting the right components from dismantling requires knowledge of the specific model's characteristics and the connections between individual powertrain sub-assemblies. In the case of more complex drivetrain repairs, the article on selecting drive axles and differentials for driving style may be helpful, as it organizes issues related to gear ratios and drivetrain component compatibility.

For users who want to deepen their knowledge about vehicle operation and maintenance, it will also be useful to read the guide materials in the blog section, where practical aspects of selecting used, refurbished, and original replacement parts are discussed. This makes it easier to consciously decide when it is worth reaching for an original vent line from dismantling, and when to consider other solutions.