Sunsong 3401870 Power Steering Return Line Hose Assembly

Power Steering Return Hose for Buick

The Sunsong 3401870 power steering return line hose assembly is built for low-pressure, high-temperature return-side service. It is precision engineered for exact fit on select Buick applications and uses corrosion-resistant steel tubing with a zinc coating for added protection against humidity, road salt, water, and grime.

Compatible with 1995-1998 Buick Riviera and 1997-1998 Buick Park Avenue with Magnetic Variable Assist, this return hose assembly restores the steering fluid path with OE-style routing and fitment. The Sunsong 3401870 is a direct replacement for worn, leaking, or rusted return line components.

Key Features

• Power steering return line hose assembly for low-pressure return-side operation
• Max working pressure rated at 250 psi
• High-grade steel tubing with zinc electroplating for corrosion resistance
• CSM hose material for high-temperature service
• Exact-fit design for select Buick Park Avenue and Buick Riviera applications
• End connections: 3/8 in. ID hose and 16 mm male O-ring
• Part number: 3401870

Detailed Description

Sunsong 3401870 is a power steering return line hose assembly engineered to meet or exceed original equipment performance standards for the return side of the steering system. It is built for 1995-1998 Buick Riviera and 1997-1998 Buick Park Avenue models with Magnetic Variable Assist, where correct hose routing, sealing, and material durability are important for stable steering-fluid return flow. The assembly uses steel tubing with zinc plating to help resist rust and surface corrosion in harsh underbody conditions. The hose is designed with a 3/8 in. ID hose end and a 16 mm male O-ring end for proper connection at the specified application. If you are replacing a leaking or corroded Buick steering return hose, 3401870 provides an OE-style service part for the original routing and fit.

This part cross-references Dayco 80001 and Gates 370470 for the same application.

Common Problems This Part Can Help Solve

• Power steering fluid leaks from a cracked or deteriorated return hose
• Rust or corrosion on the original steel line
• Soft, swollen, or heat-aged hose material
• Improper steering-fluid return flow caused by a damaged hose assembly
• Noisy steering operation related to fluid loss in the return circuit

Installation Notes and Tips

Verify the vehicle application before installation, especially on Buick Riviera and Buick Park Avenue models with Magnetic Variable Assist. Inspect the mating fittings, routing points, and surrounding components for wear or corrosion before installing the new hose assembly. Confirm that the 3/8 in. ID hose end and 16 mm male O-ring connection match the vehicle’s original setup, and check for leaks after refilling and bleeding the power steering system.

Quality Assurance

Sunsong manufactures this return hose assembly to exceed original equipment performance standards for return-side steering service. The design uses corrosion-resistant materials and exact-fit engineering to support reliable replacement on the specified Buick applications.