Sunsong 3401591 Power Steering Return Line Hose Assembly - Gear To Cooler

Power Steering Return Hose for Select GM Vehicles

Sunsong 3401591 is a power steering return line hose assembly built for low-pressure, high-temperature return-side service. It is engineered for exact fit on select Chevrolet, GMC, Buick, Cadillac, and Oldsmobile applications, including Astro, Safari, Caprice, Roadmaster, and related chassis models.

• Return hose assembly for power steering systems
• Maximum working pressure: 250 psi
• Suitable for low-pressure, high-temperature operation
• High-grade steel tubing with zinc electroplating for corrosion resistance
• Precision-engineered fit for the listed applications
• Designed to restore wearable components to original condition where required by application

Fitment Details

• Fits 1990 Chevrolet Astro, Gear To Cooler, w/o Hydroboost; Cut To Fit
• Fits 1991 Chevrolet Astro, Gear To Cooler, Power Steering Return Line Hose Assembly with Adjustable Length Option
• Fits 1992-1994 Chevrolet Astro, Gear To Cooler, w/o Hydroboost; Cut To Fit
• Fits 1990-1994 GMC Safari, Gear To Cooler, w/o Hydroboost; Cut To Fit
• Fits 1991-1993 Buick Roadmaster, N/A
• Fits 1991-1993 Chevrolet Caprice, N/A, No cooler required.
• Fits 1992-1993 Chevrolet Caprice, N/A
• Fits 1991-1993 Chevrolet Commercial Chassis, N/A, No cooler required.
• Fits 1990-1992 Cadillac Brougham, N/A
• Fits 1992 Cadillac Commercial Chassis, N/A
• Fits 1992 Chevrolet Commercial Chassis, N/A
• Fits 1991-1992 Oldsmobile Custom Cruiser, N/A

Key Features

• End 1 fitting: 3/8 in. ID hose
• End 2 fitting: 16 mm male O-ring
• Hose material: CSM
• Length: 15.8 in. (401 mm)
• Part number: 3401591
• Cross-reference: Gates 360040

What This Hose Helps Address

• Leaking or cracked power steering return hose
• Fluid seepage at return-line connections
• Corrosion-related hose deterioration
• Restricted or aged return-line routing on listed GM vehicles
• Fitment issues on replacement steering hose service

Installation Notes

Verify the vehicle’s steering configuration before installation. Some applications are listed as cut-to-fit or adjustable-length, and certain models do not use a cooler. Confirm the end fittings, routing, and length against the original hose before service. Part number 3401591 is specified for return-side use only and is not a high-pressure feed hose.

Quality Assurance

Sunsong return hoses are built to exceed original equipment performance standards for return-line service. The steel tubing is zinc electroplated to improve resistance to rust, road salt, moisture, and grime, supporting long-term durability in demanding underhood and undercar conditions.