Sunsong 3403627 Power Steering Return Line Hose Assembly - Cooler To Reservoir

Power Steering Return Hose for Mercedes-Benz ML320 and ML350

The Sunsong 3403627 power steering return line hose assembly is built for low-pressure, high-temperature return-side service. It is engineered for a precise OE-style fit on select Mercedes-Benz ML320 and ML350 applications, with corrosion-resistant tubing and wear components restored where required.

• Return line hose assembly for power steering cooler-to-reservoir routing
• Fits 1998-2003 Mercedes-Benz ML320, cooler to reservoir
• Fits 2003-2005 Mercedes-Benz ML350, cooler to reservoir
• 3/8 in. ID hose fittings on both ends
• 13.4 in. overall length
• CSM hose material for return-side steering fluid service
• High-grade steel tubing with zinc electroplating for added resistance to rust and corrosion
• Part number 3403627 for direct reference and ordering

Detailed Product Overview

Sunsong 3403627 is a power steering return line hose assembly made for the cooler-to-reservoir section on select Mercedes-Benz ML320 and Mercedes-Benz ML350 models. The assembly is built to meet or exceed original equipment performance standards for return-side steering circuits, where pressure is lower but heat and fluid exposure remain constant. The steel tubing is zinc plated to help resist corrosion from humidity, road salt, water, and grime, while the hose is precision engineered for exact fitment. This part number, 3403627, is a direct replacement option for vehicles that need a properly routed return hose assembly with OE-style dimensions.

This part cross-references Dorman HELP 81076 and Gates 352696 for the same application.

Common Repair Uses

• Leaking power steering return hose at the cooler-to-reservoir line
• Cracked or hardened hose material from heat and age
• Corrosion on the steel return line section
• Fluid seepage that can lead to low steering assist
• Noise or inconsistent steering feel caused by return-side fluid loss

Installation Notes and Tips

Verify the cooler-to-reservoir routing before installation and compare the original hose shape, length, and end fittings to Sunsong 3403627. This assembly uses 3/8 in. ID hose connections at both ends and measures 13.4 in. long, so matching the OE layout is important for proper routing and clearance. Inspect nearby brackets, grommets, heat shields, bushings, and protective sleeves during service and replace worn components as needed to restore the original condition of the steering line path.

Quality Assurance

Sunsong manufactures this return hose assembly with corrosion-resistant steel tubing and OE-style engineering for the specified Mercedes-Benz ML320 and ML350 applications. Part number 3403627 is built for return-side steering service where durability, fit, and routing accuracy matter.