Dayco 71490 Radiator Coolant Hose - Upper

Dayco 71490 Curved Radiator Hose

Dayco 71490 is a curved upper radiator coolant hose built for Nissan cooling system service. Made from EPDM and formed as a single I.D. hose, it provides a direct-fit replacement for select Nissan Frontier, Xterra, Pickup, and D21 applications with a 1 5/16 in. inside diameter at both ends.

Key Features

• EPDM construction for coolant hose service
• Curved radiator hose design for upper cooling system routing
• Single I.D. hose with 1 5/16 in. inside diameter at both ends
• Black finish
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Dayco Curved Radiator Hose line for application-specific cooling system replacement

Detailed Description

This Dayco Curved Radiator Hose is engineered for upper radiator hose replacement where a formed hose is required to follow the factory cooling path. The EPDM rubber construction is suited for coolant exposure and everyday engine bay temperatures, while the curved profile helps maintain proper routing in Nissan Frontier, Nissan Xterra, Nissan Pickup, and Nissan D21 applications. Dayco 71490 is a practical OE-style replacement for service work on the cooling system, and the part number 71490 is also referenced by several aftermarket catalogs for the same application.

The Dayco Curved Radiator Hose product line focuses on formed hose geometry and application-specific sizing for radiator and coolant connections. This hose measures 1 5/16 in. inside diameter at each end and is listed without a heat shield or protective sleeve.

Vehicle Fitment

• Fits 1998-2004 Nissan Frontier, upper
• Fits 2000-2004 Nissan Xterra, upper
• Fits 1995-1997 Nissan Pickup, upper
• Fits 1990-1994 Nissan D21, upper

What It Helps Solve

• Upper radiator hose leaks
• Cracked or hardened coolant hose rubber
• Coolant seepage at the hose connection points
• Improper hose routing from a collapsed or misshaped hose
• Cooling system service on Nissan Frontier, Xterra, Pickup, and D21 models

Installation Notes and Tips

Verify the hose routing, end diameters, and upper radiator connection points before installation. Inspect the radiator neck, engine outlet, and clamps for wear or corrosion, and replace any damaged sealing surfaces during cooling system service. Confirm fitment by year, make, model, and upper position before installation on Nissan Frontier, Nissan Xterra, Nissan Pickup, or Nissan D21 applications.

Quality Assurance

Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications for radiator hose service. Cross-reference part numbers for the same application include ACDelco 22313M and Gates 22185.