2218350164 Additional Water Pump for Mercedes Benz CL-CLASS C216 W221 M275

The 2218350164 Additional Water Pump, also known as an auxiliary coolant pump or secondary water pump, is a precision-engineered electric circulation pump designed specifically for the Mercedes-Benz CL-Class C216 coupe and S-Class W221 sedan. This component operates as a supplementary unit within the vehicle's cooling system, circulating coolant through the HVAC heater circuit and supporting engine cooling during specific operating conditions . Unlike the main mechanical water pump driven by the engine, this electric auxiliary pump ensures consistent coolant flow regardless of engine RPM. As a direct OEM-grade replacement, this part restores proper heater performance, supports engine thermal management, and maintains the sophisticated climate comfort expected from these flagship Mercedes-Benz vehicles covering model years 2007 to 2014

• OEM Direct Fitment: Engineered to replace original part number 2218350164, designed exclusively for Mercedes-Benz CL-Class C216 (2007-2014) and S-Class W221 (2007-2013) models, including AMG variants.

• Electric Circulation Design: Features a 12V brushless electric motor that operates independently of engine speed, providing consistent coolant circulation during idle, low-speed driving, and after engine shutdown.

• Durable Material Construction: Manufactured with high-quality plastic housing and corrosion-resistant internal components, weighing approximately 0.35kg (0.77 lbs) for easy handling and installation.

• 2-Pin D-Shape Electrical Connector: Equipped with a secure 2-pin connector featuring a D-shaped interface design, ensuring reliable electrical connection and proper sealing against moisture ingress.

• Compact Dimensions: Sized at approximately 8.5cm in length, 7cm in width, and 14.5cm in height, designed for straightforward integration into the existing cooling system layout.

• Broad Vehicle Compatibility: Covers a comprehensive range of models including S350, S400 Hybrid, S550, S600, S63 AMG, S65 AMG, CL550, CL600, CL63 AMG, and CL65 AMG, with both rear-wheel drive and 4MATIC configurations.

• Quality Brand Options Available: Available from reputable manufacturers including Vemo, First Line, Metzger, and genuine Mercedes-Benz OEM, offering various price points to suit different budgets and quality requirements.

• Restores HVAC Heater Performance: When the auxiliary water pump fails, hot coolant stops circulating through the heater core, resulting in weak or no heat from the climate control system, especially at idle. Replacing this pump restores full heating capability and cabin comfort during cold weather operation.

• Prevents Engine Overheating in Specific Conditions: The auxiliary pump supports the main cooling system during low-speed driving, heavy traffic, and after engine shutdown (thermal soak). A failed pump can lead to localized hot spots and reduced cooling efficiency. This replacement ensures complete thermal management.

• Eliminates Unusual Noises from Pump Failure: A failing auxiliary water pump often produces audible whining, grinding, or clicking sounds audible from the engine bay or cabin. This high-quality replacement operates quietly and reliably, restoring the refined acoustic environment of the Mercedes-Benz S-Class.

• Specifically Compatible with M275 V12 and High-Performance AMG Models: Unlike universal pumps, this unit is calibrated for the specific flow rate and electrical requirements of the W221 S-Class and C216 CL-Class, including the M275 V12 biturbo, M156, M157, M278, M273, and M285 engine variants. Covers high-performance AMG models including S63 AMG, S65 AMG, CL63 AMG, and CL65 AMG.

• Direct Plug-and-Play Installation: Designed as a direct replacement with no modifications required. The pump bolts directly to the factory mounting location and connects to the existing electrical harness, saving diagnostic and installation time for professional mechanics and experienced DIY users.

• Cost-Effective OEM Alternative: Genuine Mercedes-Benz auxiliary water pumps typically retail between 270-308 . This replacement offers OE-quality performance, fitment, and durability at a competitive price point, often available for 50-240 depending on brand and condition.

• Prevents Secondary Cooling System Failures: In vehicles with auxiliary heating systems or complex climate control zones, this pump is essential for proper coolant distribution. Replacement prevents cascading issues with heater valves, climate control units, and electronic cooling system components.

• Long Service Life with Quality Materials: Manufactured with corrosion-resistant components and durable plastic housing, this pump is designed to withstand years of exposure to hot coolant, vibration, and thermal cycling, offering extended replacement intervals compared to low-quality aftermarket alternatives .