Dayco 70115 Radiator Coolant Hose

Curved Radiator Hose for OE-Style Cooling Service

The Dayco 70115 curved radiator hose is a radiator coolant hose built from EPDM for dependable coolant transfer in upper and lower cooling-system applications. With a 1 1/2 in. inside diameter at both ends and a black finish, it is shaped for direct replacement use on a wide range of classic and late-model vehicles.

Use this hose when servicing vehicles such as the Isuzu Trooper, Ford Explorer Sport Trac, and Dodge truck applications that call for a curved radiator hose with the listed dimensions and position-specific fitment.

Key Features

• EPDM construction for cooling-system durability
• 1 1/2 in. inside diameter at both ends
• Single I.D. hose design for radiator coolant routing
• Black finish for a clean OE-style appearance
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Fits upper, lower, and upper pipe-to-radiator applications listed below

Product Details

Dayco Curved Radiator Hose 70115 is engineered for vehicles that require a formed hose with matching end diameters and a specific curved profile. The EPDM rubber construction is suited for coolant circulation in demanding engine bay conditions, while the hose geometry helps maintain the proper routing between the radiator and engine components. This part cross-references Gates 20230 for the same application.

Fitment includes 1992-2002 Isuzu Trooper, upper; 2001 Ford Explorer Sport Trac, upper - pipe to radiator; 1996-1999 Acura SLX, upper; and multiple Dodge, Chrysler, Mercedes-Benz, Buick, and Chevrolet applications. The Dayco 70115 part number is also referenced across interchange listings for service replacement research.

Common Cooling Issues This Hose Can Address

• Cracked or split radiator hose material
• Coolant leaks at the hose body or ends
• Collapsed or softened hose sections from age and heat
• Incorrect hose routing on curved upper or lower radiator runs
• Replacement needs for vehicles with air conditioning or heavy-duty cooling notes in the fitment list

Installation Notes and Tips

• Verify end inside diameter, outside diameter, and hose routing before installation.
• Match the vehicle position exactly: upper, lower, or upper pipe-to-radiator.
• Inspect radiator necks and engine fittings for corrosion or damage before installing the hose.
• Confirm clearance around nearby components, especially on curved routing applications.
• Use the fitment notes for A/C, heavy-duty cooling, and radiator configuration details.

Quality Assurance

This hose is manufactured to SAE J20R4 Class D-1 and SAE J1684 Type EC standards, supporting consistent material and performance requirements for radiator coolant hose service.