Dayco 70680 Radiator Coolant Hose - Lower or Lower - Pipe To Engine

Dayco 70680 Curved Radiator Hose Overview

Dayco 70680 is a curved radiator coolant hose built for lower cooling-system routing on a wide range of Ford trucks and vans. Made from EPDM and finished in black, it is shaped for applications that require a dual I.D. hose with 1 3/4 in. and 1 7/8 in. end diameters.

For Ford E-150 Econoline, E-250 Econoline, E-350 Econoline, and classic F-Series applications, this hose supports lower radiator connections where a formed replacement is needed. The Dayco Curved Radiator Hose line is engineered around OE-style fitment details, including application-specific bends and SAE J20R4 Class D-1 / SAE J1684 Type EC specifications.

Key Features

• Part number 70680 for direct identification and ordering
• EPDM construction for cooling-system hose service
• Dual I.D. hose design with 1 3/4 in. and 1 7/8 in. ends
• Curved lower radiator hose shape for routed Ford applications
• Black finish for a clean OE-style appearance
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC standards
• No heat shield and no protective sleeve

Detailed Description

This Dayco radiator coolant hose is intended for lower radiator use on many Ford E-Series vans and Ford F-Series trucks across model years from 1965 through 1990. It is listed for numerous Ford E-100, E-150, E-250, and E-350 Econoline and Club Wagon configurations, plus F-100, F-150, F-250, and F-350 applications with the specified lower hose routing. The formed profile helps match the original hose path in vehicles that need a curved replacement rather than a straight universal hose.

This part cross-references Gates 20608 and Motorcraft KM71 for the same application. Dayco 70680 is a practical search match for buyers looking for a lower radiator hose for Ford Econoline or Ford F-Series cooling-system service.

What It Helps Address

• Cracked or hardened lower radiator hose material
• Coolant leaks at the lower hose connection
• Incorrect hose shape after prior repairs
• Restricted cooling-system flow caused by hose deterioration
• Fitment issues on Ford E-Series and F-Series lower hose routing

Installation Notes and Tips

Verify end diameters, routing, and radiator configuration before installation. This hose is listed for lower positions only, and some Ford applications require attention to radiator size, air conditioning, or heavy-duty notes shown in the fitment data. Inspect clamps, necks, and adjoining cooling components before reuse, and confirm the hose seats fully without twist or kinking.

Fits 1965-1990 Ford E-Series vans and 1965-1979 Ford F-Series trucks in the lower radiator position, including the specific Econoline and F-100/F-150/F-250/F-350 applications shown in the fitment table.

Quality Assurance

Dayco manufactures this hose to published SAE specifications for radiator coolant hose service and application-specific fitment. The 70680 part number is supported by broad interchange coverage across major aftermarket and OE reference numbers for Ford cooling-system applications.