2055017601 Air Vent Pipe for Mercedes Benz C-CLASS W205 V205 S205 C205 M264

The 2055017601 Air Vent Pipe, also known as a coolant vent hose, expansion tank return line, or degassing line, is a precision-engineered cooling system component specifically designed for the Mercedes-Benz C-Class, including W205 sedan, V205 long-wheelbase, S205 wagon, and C205 coupe models. This component is specifically engineered for vehicles equipped with the M264 engine, which was introduced during the W205 generation's mid-cycle refresh starting in 2018 . The vent pipe serves a critical function in the cooling system by allowing trapped air and excess coolant vapor to escape from the engine and radiator into the expansion tank, preventing air pockets that can lead to localized overheating and cooling system inefficiency . As a direct OEM-grade replacement, this hose restores proper system degassing, maintains consistent coolant flow, and protects the M264 engine from heat-related damage.

• OEM Direct Fitment: Engineered to replace original Mercedes-Benz part number 2055017601 (also referenced as A2055017601), designed specifically for W205/V205/S205/C205 C-Class platforms with the M264 engine configuration .

• High-Quality Synthetic Polymer/Rubber Construction: Manufactured from durable EPDM rubber or synthetic polymer blend that offers exceptional resistance to extreme temperatures (operating range of -30°C to 120°C), high pressure, and long-term exposure to hot coolant and engine chemicals .

• Reinforced Flexible Design: Features internal reinforcement and a flexible structure that allows a bend radius of approximately 30mm, enabling proper routing through tight engine bay spaces without kinking or collapsing .

• Leak-Proof Molded Connectors: Equipped with precision-molded, secure connector ends that ensure a tight, leak-free seal when attached to the expansion tank and engine cooling ports, preventing coolant loss and system contamination .

• Corrosion and Chemical Resistance: The advanced rubber compound resists degradation from ethylene glycol-based antifreeze, engine oil residue, and other underhood contaminants, ensuring long-term durability .

• Pressure Rating Capability: Capable of withstanding cooling system operating pressures, with aftermarket options offering ratings from 8 to 12 bar depending on specification level .

• Prevents Engine Overheating Caused by Air Pockets: Trapped air in the cooling system can create steam pockets that block coolant flow and cause localized hot spots, potentially leading to head gasket failure or cracked cylinder heads. This vent pipe ensures continuous air evacuation from the system, protecting the M264 engine from catastrophic heat damage .

• Specifically Designed for M264 Engine in W205 C-Class: Unlike universal hoses or parts designed for earlier M274 engines, this vent pipe is molded to the exact specifications of the post-2018 M264-powered C-Class. The M264 engine introduced significant changes including reduced displacement and increased thermal efficiency requirements, making proper cooling system components critical .

• Restores Proper Coolant Circulation and Heater Performance: A cracked or clogged vent pipe can disrupt the entire cooling system, leading to erratic temperature gauge readings, poor cabin heater output, and coolant loss. Replacing this component restores factory-specified degassing function and cooling system efficiency.

• Eliminates Coolant Leaks and Low Coolant Warnings: Over time, original vent pipes can become brittle, crack at the connector ends, or develop pinhole leaks due to thermal cycling. This replacement provides a fresh, reliable seal, eliminating the need for frequent coolant top-ups and dashboard warning lights.

• Direct Plug-and-Play Installation: Designed as a direct replacement requiring no cutting, splicing, or modifications. The pipe installs using factory routing paths and existing mounting points, saving significant labor time for professional mechanics and making it accessible for experienced DIY owners.

• Cost-Effective OEM-Quality Alternative: Genuine Mercedes-Benz cooling system components can carry premium dealership pricing. This replacement offers factory-grade fitment, materials, and durability at a competitive price point, with options available from reputable brands including Febi, Nilos, Gates, and genuine OEM suppliers .

• Essential Preventive Maintenance Component: Cooling system hoses and vent pipes have a finite service life, typically 5-7 years. Replacing the vent pipe proactively as part of routine cooling system service, especially during water pump or thermostat replacement, prevents unexpected roadside failures and towing expenses.

• Broad Brand Availability: This part number is readily available from multiple quality sources including OEM (Mercedes-Benz original), Genuine 4S (dealership-sourced), and aftermarket brands such as CoverTS, Nilos, Gates, and WK, offering flexibility in price and availability .