Cardone 5W-3003 Engine Auxiliary Water Pump - Heater

Engine Auxiliary Water Pump for Mercedes-Benz Heater Systems

Cardone 5W-3003 is a brand new engine auxiliary water pump for Mercedes-Benz heater applications. It is built with upgraded internal components to improve flow consistency, reduce friction, and help extend service life in demanding cooling-system use.

Key Features

• 100% functionality tested for performance and reliability
• Upgraded resin-impregnated bearings to reduce friction and improve longevity
• Improved rubber sealant to help prevent leaks and maintain consistent coolant flow
• Metal, plastic, and rubber construction for application-specific durability
• 1 connector with pin/male terminal configuration and 2 terminals
• Inlet and outlet pipe diameters measure 0.59 in.

Product Details

The Cardone Engine Auxiliary Water Pump line focuses on replacement coolant pumps built with upgraded wear components over original equipment hardware. For this application, the 5W-3003 auxiliary coolant pump supports heater circuit circulation in Mercedes-Benz vehicles, including C230, C240, C320, C32 AMG, C280, C350, C55 AMG, CLK320, CLK350, CLK500, CLK550, CLK55 AMG, CLK63 AMG, and SL65 AMG models. This part cross-references Mercedes-Benz 2038350064 for the same application. If you are replacing a Mercedes-Benz auxiliary coolant pump for heater performance, Cardone 5W-3003 provides a direct-fit service part for the listed vehicles.

Common Problems This Part Can Address

• Weak or inconsistent heater output caused by auxiliary pump wear
• Coolant leaks from aging seals or pump housing components
• Noisy operation from worn bearings
• Reduced coolant circulation through the heater circuit
• Electrical connection issues at the pump terminal interface

Installation Notes and Tips

Verify connector style, terminal count, inlet and outlet diameter, and mounting location before installation. This auxiliary water pump is used in the heater position, so confirm the vehicle’s original routing and electrical connection match the OE layout. On Mercedes-Benz C230, C240, C320, CLK500, and related applications, compare the original part number and hose connections before removal to ensure correct replacement.

Quality Assurance

Cardone tests these auxiliary coolant pumps under varied conditions to evaluate real-world reliability. The 5W-3003 is a new unit backed by a limited lifetime warranty.