Dayco 71748 Radiator Coolant Hose - Lower - Pipe To Engine or Thermostat To Engine

Dayco Curved Radiator Hose 71748

Dayco 71748 is a curved radiator coolant hose built for specific Nissan and INFINITI cooling system applications. Made from EPDM rubber with a black finish, it uses a single I.D. hose design and 1 1/16-inch inside diameter ends for a direct replacement on listed vehicles.

The Dayco Curved Radiator Hose line focuses on OE-style routing and fitment for engine cooling service. This hose follows the curved path needed in the cooling circuit and meets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications for radiator hose applications.

Key Features

• EPDM construction for radiator coolant service
• Black finish for a factory-style appearance
• Single I.D. hose design
• 1 1/16-inch inside diameter at both ends
• Curved hose profile for listed thermostat-to-engine and lower pipe-to-engine applications
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC standards
• No heat shield or protective sleeve included

Detailed Description

Dayco 71748 is a curved radiator coolant hose engineered for cooling system routing where a formed hose is required. The EPDM rubber construction is suited for coolant exposure and temperature cycling, while the curved shape helps match the original hose path in the engine bay. This part number is listed for 2000-2001 INFINITI I30 thermostat to engine applications, 2000-2001 Nissan Maxima thermostat to engine applications, 1991-1994 Nissan Sentra lower pipe to engine applications, and 1992-1993 Nissan NX lower pipe to engine applications. If you are replacing a worn hose on a Nissan Maxima, INFINITI I30, Nissan Sentra, or Nissan NX, Dayco 71748 provides a direct-fit cooling system service part for the specified locations.

This part cross-references Gates 21404 for the same application.

What It Is Used For

• Replacing a cracked or softened radiator coolant hose
• Restoring coolant flow between the thermostat housing and engine
• Replacing a lower cooling hose routed from pipe to engine
• Addressing coolant seepage at hose ends
• Correcting hose collapse, swelling, or heat-related deterioration

Installation Notes and Tips

Verify the hose routing, end diameters, and vehicle application before installation. Inspect hose clamps, mating pipes, and thermostat housing connections for corrosion or damage before fitting the new hose. Confirm that the hose follows the original curved path without twisting so the cooling system maintains proper clearance and alignment.

Quality Assurance

Dayco 71748 is manufactured to SAE J20R4 Class D-1 and SAE J1684 Type EC requirements for radiator hose service. The EPDM material and formed construction support consistent cooling system replacement on the listed Nissan and INFINITI applications.