Dayco 70930 Radiator Coolant Hose - Lower

Dayco Curved Radiator Hose 70930

Dayco 70930 is a curved radiator coolant hose built for lower cooling-system routing on select 1977 Ford trucks. Made from EPDM rubber and formed as a dual I.D. hose, it provides the correct transition between different hose diameters in applications that require a curved lower hose layout.

This Dayco Curved Radiator Hose line is focused on OE-style cooling-system replacement with application-specific shapes and dimensions. Part number 70930 is sized with a 1 3/4-inch inside diameter on one end and a 2-inch inside diameter on the other, making it a direct-match option for the listed Ford F-Series lower radiator hose applications.

Key Features

• EPDM construction for radiator coolant service
• Black finish for a factory-style appearance
• Dual I.D. hose design with 1 3/4-inch and 2-inch end diameters
• Curved hose shape for lower radiator routing
• Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
• Fits 1977 Ford F-100, lower
• Fits 1977 Ford F-150, lower
• Fits 1977 Ford F-250, lower
• Fits 1977 Ford F-350, lower

Detailed Description

Dayco 70930 is a radiator coolant hose for lower-position cooling-system connections on 1977 Ford F-100, F-150, F-250, and F-350 models. The curved profile supports the routing needed in these truck applications, including versions noted for 2 3/4-inch thick radiator top configurations and 4-inch thick radiators with A/C. If you are replacing a worn lower hose on a 1977 Ford F-100, F-150, F-250, or F-350, this part number 70930 matches the listed fitment and hose dimensions.

This part cross-references Ford D7TA-8B273-CC and Gates 21053 for the same application.

Common Problems This Hose Can Address

• Coolant leakage from a cracked or aged lower radiator hose
• Softening, swelling, or collapse of the original EPDM hose
• Improper hose routing caused by a damaged curved hose
• Cooling-system service on 1977 Ford F-Series trucks with the listed lower hose configuration
• Replacement of a hose that no longer seals correctly at the radiator or engine connection points

Installation Notes and Tips

Verify the end diameters, curved shape, and lower-position routing before installation. Compare the existing hose to the Dayco 70930 profile and confirm clearance around nearby components, especially on trucks with A/C or thicker radiator configurations. Inspect hose clamps, necks, and adjoining cooling-system parts for wear before reassembly.

Quality Assurance

Dayco lists this hose to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications, supporting its use in radiator coolant service. The EPDM construction is selected for cooling-system duty in the specified Ford truck applications.