Dayco 71242 Radiator Coolant Hose - Lower - Pipe To Radiator or Upper

Curved Radiator Hose for Nissan and GM Applications

Dayco 71242 is a curved radiator coolant hose built from EPDM for dependable coolant transfer in select Nissan, Infiniti, Chevrolet, and GMC applications. This dual I.D. hose is shaped for lower pipe-to-radiator routing on Pathfinder and QX4 models, and upper radiator routing on select S10, S10 Blazer, S15, and S15 Jimmy vehicles.

The Dayco Curved Radiator Hose line is engineered for replacement cooling-system service where formed hose geometry and correct inside diameters matter. Part number 71242 follows SAE J20R4 Class D-1 and SAE J1684 Type EC specifications for the listed applications.

Key Features

• EPDM construction for cooling-system use
• Black finish for a clean OE-style appearance
• Dual I.D. hose design with 1 1/4 in. end 1 inside diameter and 1 9/16 in. end 2 inside diameter
• Curved hose profile for routed radiator connections
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC requirements
• Dayco 71242 radiator coolant hose for select upper and lower cooling-system applications

Detailed Description

Dayco 71242 is a formed radiator coolant hose made for vehicles that require a curved hose with dual inside diameters. The EPDM rubber construction is suited to coolant exposure and the hose’s 15 1/2 in. trunk height supports the shaped routing needed in the listed applications. Use this hose when replacing a worn, cracked, or softened radiator hose on a Nissan Pathfinder, Infiniti QX4, or select Chevrolet and GMC trucks and SUVs.

Fits 1997-2000 INFINITI QX4, Lower - Pipe To Radiator. Fits 1996-2000 Nissan Pathfinder, Lower - Pipe To Radiator. Fits 1985-1986 Chevrolet S10, Upper. Fits 1985-1986 Chevrolet S10 Blazer, Upper. Fits 1985-1986 GMC S15, Upper. Fits 1985-1986 GMC S15 Jimmy, Upper. This part cross-references ACDelco 24360L and Gates 22275 for the same application.

What This Hose Helps Address

• Coolant leaks from a cracked or aged radiator hose
• Softening, swelling, or collapse in the hose body
• Incorrect hose fitment at the radiator or pipe connection
• Cooling-system service on curved hose routing
• Replacement needs for lower pipe-to-radiator or upper radiator connections

Installation Notes and Quality Assurance

Verify the end inside diameters, hose routing, and position before installation. Inspect clamps, pipe ends, and radiator necks for corrosion or damage before fitting the new hose. Confirm the application matches your vehicle’s upper or lower cooling-system layout, especially on Nissan Pathfinder and Infiniti QX4 lower hose applications and Chevrolet S10, S10 Blazer, GMC S15, and GMC S15 Jimmy upper hose applications.

Dayco manufactures this hose to meet the listed SAE specifications for the confirmed applications. Part number 71242 is a direct-fit cooling-system service part for the vehicles shown above.