Dayco 71600 Radiator Coolant Hose - Lower - Engine To Oil Cooler, Lower - Pipe To Engine or Lower - Pipe To Water Pump

Curved Radiator Hose for Ford Cooling Systems

Dayco 71600 is a curved radiator coolant hose built for Ford cooling-system routing where a dual inside diameter is required. Made from EPDM and finished in black, it is shaped for lower hose applications on select Ford Explorer, F-250, F-350, and E-Series models.

The Dayco Curved Radiator Hose line focuses on application-specific hose geometry and OE-style fitment for coolant transfer paths that need a formed bend rather than a straight hose. Part number 71600 follows the listed SAE J20R4 Class D-1 and SAE J1684 Type EC specifications for radiator hose service.

• EPDM construction for coolant hose service
• Black finish for a factory-style appearance
• Dual I.D. hose design with 1 21/32 in. end 1 inside diameter and 1 25/32 in. end 2 inside diameter
• Curved radiator hose shape for lower cooling-system routing
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC requirements
• Dayco 71600 cross-references ACDelco 20254S and Gates 21909

Use Dayco 71600 when replacing a lower radiator hose on Ford applications that route coolant from the pipe to the water pump or from the engine to the oil cooler. This hose is listed for 1997-1998 Ford Explorer lower pipe-to-water-pump applications, 1997 Ford F-250 HD lower engine-to-oil-cooler applications, and multiple 1990s Ford F-250, F-350, and E-350 Econoline configurations. The formed profile helps match the original hose path and maintain proper coolant flow in the lower cooling circuit.

Common Problems This Hose Addresses

• Cracked or hardened lower radiator hose material
• Coolant leaks at a worn hose bend or connection point
• Incorrect hose routing on Ford lower cooling-system applications
• Collapsed or softened hose sections from age and heat cycling
• Replacement needs for a dual I.D. curved hose layout

Installation Notes and Tips

Verify the hose routing, end diameters, and position before installation. This part is listed for lower radiator hose locations including lower pipe-to-water-pump, lower engine-to-oil-cooler, and lower pipe-to-engine applications. Inspect clamps, mating tubes, and nearby cooling components for wear or corrosion before installing the new hose.

Quality Assurance

Dayco manufactures this hose to published SAE hose specifications and application-specific dimensions for Ford cooling-system service. Confirm fitment against the vehicle listing and the original hose shape before installation.