Dayco 71611 Radiator Coolant Hose - Upper

Curved Upper Radiator Hose for Nissan and Infiniti

Dayco 71611 is a curved radiator coolant hose built for upper cooling-system routing on select Nissan and INFINITI applications. Made from EPDM rubber and finished in black, it provides a direct-fit replacement for vehicles that use a 1 5/16 in. inside diameter at both ends.

The Dayco Curved Radiator Hose line focuses on OE-style hose geometry and material selection for cooling-system service. This hose follows the curved upper hose shape needed on the listed applications, helping maintain proper coolant flow path and fitment in the engine bay.

• EPDM construction for coolant-hose service
• Black finish for a factory-style appearance
• Single I.D. hose design
• 1 5/16 in. inside diameter at both ends
• Meets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Fits upper radiator hose locations on select Nissan Sentra, 200SX, NX, and INFINITI G20 applications

Detailed Product Overview

Dayco 71611 is a curved upper radiator hose for cooling-system replacement on select 1991-2002 Nissan and INFINITI vehicles. It is built from EPDM, a common material for coolant hose service, and uses a single I.D. hose layout with matching 1 5/16 in. end diameters. This part number is a practical choice when replacing a worn or leaking upper radiator coolant hose on a Nissan Sentra, Nissan 200SX, Nissan NX, or INFINITI G20.

This part cross-references Gates 21763 for the same application.

Common Cooling-System Issues It Can Address

• Cracked or hardened upper radiator hose material
• Coolant seepage at the hose body or ends
• Collapsed or softened hose sections under heat and pressure
• Incorrect hose routing after a previous repair
• Fitment problems when replacing the upper hose on listed Nissan and INFINITI models

Installation Notes and Tips

Verify the hose routing, end diameters, and upper-position fitment before installation. Inspect hose clamps, radiator necks, and engine-side connections for wear or corrosion, and replace any damaged sealing surfaces before filling the cooling system. After installation, refill and bleed the system according to the vehicle service procedure and check for leaks at operating temperature.

Quality Assurance

Dayco cooling hoses are built to meet SAE J20R4 Class D-1 and SAE J1684 Type EC requirements for hose service. Part number 71611 is specified for upper radiator hose applications on select 1991-2002 Nissan Sentra, 1995-1998 Nissan 200SX, 1991-1993 Nissan NX, and 1991-2002 INFINITI G20 models.