Dayco 70688 Radiator Coolant Hose

Curved Radiator Hose for Ford Cooling Service

Dayco 70688 is a curved radiator coolant hose built for the lower cooling circuit on select 1969 Ford trucks without air conditioning. Made from EPDM rubber, it provides the flexibility and heat resistance needed for coolant routing in classic Ford F-100, F-250, and F-350 applications.

This Dayco Curved Radiator Hose line is engineered for direct-fit cooling system service, with a single I.D. hose design and SAE J20R4 Class D-1 / SAE J1684 Type EC compliance. The black hose measures 2 inches inside diameter at both ends and is shaped to follow the factory routing used on the lower radiator connection.

Key Features

• Dayco 70688 curved radiator coolant hose
• EPDM construction for cooling system use
• 2-inch inside diameter at both ends
• Single I.D. hose design for lower radiator routing
• Black finish for a factory-style appearance
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Fits 1969 Ford F-100, lower, without air conditioning
• Fits 1969 Ford F-250, lower, without air conditioning
• Fits 1969 Ford F-350, lower, without air conditioning

Detailed Description

Dayco 70688 is a curved radiator hose for the lower coolant path on 1969 Ford F-100, F-250, and F-350 trucks without air conditioning. The EPDM rubber construction is suited for coolant exposure and the curved profile helps match the original hose routing in these Ford truck cooling systems. If you are replacing a worn lower radiator hose on a classic Ford pickup, this part number provides a direct service option for the specified applications. This part cross-references Ford C9TZ-8286-B and Duralast C70688 for the same application.

Common Problems This Hose Can Address

• Cracked or hardened lower radiator hose material
• Coolant seepage at the hose connection points
• Collapsed or softened hose affecting coolant flow
• Incorrect hose shape for factory-style routing
• Replacement needs during cooling system repair on classic Ford trucks

Installation Notes and Tips

Verify the vehicle is a 1969 Ford F-100, F-250, or F-350 without air conditioning before installation. Confirm the lower hose routing and 2-inch end diameters match the original cooling system layout, and inspect the radiator neck and engine outlet for corrosion or debris before installing Dayco 70688. Replace coolant as needed and check the system for leaks after service.

Quality Assurance

Dayco manufactures this curved radiator hose to meet SAE J20R4 Class D-1 and SAE J1684 Type EC requirements for radiator coolant hose applications. The EPDM construction and application-specific shape support reliable cooling system service on the listed Ford truck fitments.