Mercedes W221 W216 Crankcase Breather Vacuum Pipe Hose Line A2214713815

Mercedes W221 W216 Crankcase Breather Vacuum Pipe Hose Line is an original crankcase breather vacuum pipe designed for use in the engines of Mercedes S-Class W221 and CL W216 models. This component belongs to the Cooling system pipes and hoses group, allowing it to work in conjunction with the engine's thermal management system, stabilizing engine operating conditions and reducing the risk of improper crankcase ventilation.

Specifications and technical data

• SKU: A2214713815
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2214713815
• Substitutable numbers: A2214713815, A 221 471 38 15
• Category: Coolant Hoses

Purpose and technical function

The presented crankcase breather vacuum pipe has been specifically designed for Mercedes engine architectures where precise control of gas flow from within the engine is critical. A properly routed vacuum circuit contributes to:

• stable operation of the crankcase ventilation system,
• maintaining proper pressure inside the engine unit,
• reducing contaminants entering the intake system,
• cooperation with cooling system components responsible for maintaining the engine's operating temperature.

Thanks to its factory-spec fitment, the pipe ensures proper vacuum routing, which translates into stable engine performance and predictable unit behavior under various load conditions.

Construction and cooling system fitment

As a component from the Cooling system pipes and hoses group, this vacuum pipe works with components responsible for engine temperature control. The appropriate shaping and internal diameter of the pipe allow for:

• correct vacuum routing in the vicinity of cooling system components,
• maintaining connection tightness under varying temperature conditions,
• reduction of stresses resulting from engine operation and body vibrations.

The original geometry of the pipe facilitates installation at factory mounting points, which minimizes the risk of chafing, kinking, or improper positioning in the engine bay.

Condition, origin, and benefits of use

The component comes from a Mercedes vehicle and is part of the original installation, which means full compliance with the manufacturer's factory standards. The used nature of the product allows for an economical replacement of a worn or damaged pipe while maintaining the high quality of workmanship typical of OEM solutions.

Using an original crankcase breather vacuum pipe instead of non-factory replacements promotes:

• maintaining the engine performance characteristics designed by the manufacturer,
• reducing the risk of leaks in the vacuum system,
• better compatibility with other cooling system pipes and hoses.

Cooling system integration and diagnostics

A functional crankcase breather vacuum pipe is important not only for engine ventilation but also for operating temperature stability, as incorrect pressure and excessive blow-by can indirectly affect the thermal load of the unit. In the case of symptoms such as unstable idle, increased oil consumption, or concerning operating temperatures, it is worth including this component in your diagnostic checks.

To better understand the relationships between pipes, hoses, and the entire cooling system, the following article describing typical engine overheating problems will be helpful: Engine cooling system – overheating, repair, and used radiators. This will allow you to take a conscious approach to inspecting components in the engine bay and plan the preventive replacement of worn parts.

Complementary Mercedes cooling system pipes and hoses

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 return lines, connecting hoses, or flexible sections of the installation, check the available parts in the Mercedes cooling system pipes and hoses category.