Dayco 71805 Radiator Coolant Hose - Upper

Dayco Curved Radiator Hose 71805

Dayco 71805 is a curved radiator coolant hose built for upper cooling-system routing on select Volvo applications. Made from EPDM rubber and finished in black, it uses a dual I.D. hose design to match the different connection sizes required by the application.

Compatible with 1993-1997 Volvo 850, 1998-2000 Volvo S70, 1998-2001 Volvo V70, 1998-2001 Volvo C70, and 2001 Volvo S60, this hose is specified for upper radiator use. The Dayco Curved Radiator Hose line focuses on application-specific hose shapes and dimensions for direct replacement service.

Key Features

• Part number: 71805
• Brand: Dayco Curved Radiator Hose
• Radiator coolant hose for upper hose routing
• EPDM construction for cooling-system service
• Black finish
• Dual I.D. hose with 1 7/32 in. end 1 inside diameter and 1 11/32 in. end 2 inside diameter
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications

Detailed Description

Dayco 71805 is a curved upper radiator hose engineered for Volvo cooling-system fitment where a dual inside diameter is required. Its EPDM rubber construction is suited to coolant exposure and underhood temperature cycling, while the curved profile supports the factory hose path on the vehicle. This part number is commonly searched as a Volvo upper radiator hose replacement for 1993-1997 Volvo 850, 1998-2000 Volvo S70, 1998-2001 Volvo V70, 1998-2001 Volvo C70, and 2001 Volvo S60.

This part cross-references Gates 22251 and NAPA 8891 for the same application.

What It Helps Address

• Cracked or hardened upper radiator hose material
• Coolant leaks at the hose body or connection points
• Incorrect hose fitment caused by mismatched inside diameters
• Cooling-system service on Volvo models with curved upper hose routing
• Replacement of a worn Dayco 71805-style radiator hose

Installation Notes and Tips

Verify the hose routing, end diameters, and upper-position fitment before installation. Inspect the mating necks, clamps, and nearby cooling components for wear or corrosion, and confirm the hose seats fully without twisting. Because this is a dual I.D. hose, matching the correct end to each connection is important for proper fit.

Quality Assurance

Dayco manufactures this hose to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications for radiator hose service. The EPDM material and application-specific curved shape support consistent replacement fitment on the listed Volvo vehicles.