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Dayco 70689 Radiator Coolant Hose - Lower, Lower - Pipe To Radiator or Upper
| Brand | Dayco 70689 |
|---|---|
| Position | Lower |
| Color | Black |
| End 1 Inside Diameter | 2 |
| End 2 Inside Diameter | 2 |
| Hose Type | Single I.D. Hose |
| Material | EPDM |
| SAE Specification | SAE J20R4 Class D-1, SAE J1684 Type EC |
| Trunk Height | 14 |
| Product line | Curved Radiator Hose |
| Fits | Ford and Edsel · 8 vehicles |
EPDM construction. Resists heat and coolant exposure for dependable hose performance.
Single I.D. hose. Provides a straightforward coolant flow path in a flexible design.
SAE J20R4 Class D-1. Built to meet recognized coolant hose specifications.
Cross-references ACDelco 22034M, CARQUEST 20557 and Duralast C70689 for the same application. See all 17.
Dayco 70689 Curved Radiator Hose
Dayco 70689 is a curved radiator coolant hose built for select Ford truck cooling systems that require a 2-inch inside diameter at both ends. Made from EPDM rubber in black, this single I.D. hose is specified for 1965-1966 Ford F-100 and F-250 applications with lower or upper radiator hose routing as listed below.
Key Features
- EPDM construction for coolant-system service
- Black finish for a clean OE-style appearance
- 2-inch inside diameter at both ends
- Single I.D. hose design for curved routing
- Built to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
- Dayco curved radiator hose line for application-specific cooling fitment
Application Details
This Dayco curved radiator hose, part number 70689, is listed for 1965 Ford F-100 lower, 1965 Ford F-250 lower, 1966 Ford F-100 lower, 1966 Ford F-100 lower with 2WD, 1966 Ford F-100 lower with 4WD, 1966 Ford F-250 lower with 2WD, and 1966 Ford F-250 upper with 4WD. It is also a direct-reference replacement for common cross numbers such as Gates 20557 and Motorcraft KM271 for the same application.
The Dayco Curved Radiator Hose line is focused on formed coolant hoses that match the routing and diameter requirements of specific vehicles. For buyers searching for a 1965-1966 Ford F-100 radiator hose or a 1965-1966 Ford F-250 coolant hose, Dayco 70689 provides the correct curved profile for the listed positions.
Common Problems This Hose Can Address
- Cracked or split radiator hose material
- Coolant leaks at the hose body
- Incorrect hose shape or routing on replacement service
- Softening or deterioration from heat and coolant exposure
- Fitment issues caused by using a hose with the wrong inside diameter
Installation Notes and Tips
Verify the hose position, routing, and end diameters before installation. Confirm that the vehicle matches the listed Ford F-100 or Ford F-250 application, including 2WD or 4WD notes where shown, and inspect the necks and clamps for wear before installing the new hose. Because this is a formed curved hose, proper alignment during installation helps maintain correct coolant flow and reduces stress on the hose.
Quality Assurance
Dayco manufactures this radiator coolant hose to SAE J20R4 Class D-1 and SAE J1684 Type EC specifications, supporting consistent material and dimensional requirements for cooling-system service.
| Year | Make | Model | Drive Type | Transmission | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|---|---|
| 1966 | Ford | F-100 | — | Manual | 5.8L | V8 | — | Lower | w/2WD; Curved Radiator Hose |
| 1966 | Ford | F-100 | — | — | 5.8L | V8 | — | Lower | w/4WD; Curved Radiator Hose |
| 1966 | Ford | F-250 | — | Manual | 5.8L | V8 | — | Lower | w/2WD; Curved Radiator Hose |
| 1966 | Ford | F-250 | — | — | 5.8L | V8 | — | Upper | w/4WD; Curved Radiator Hose |
| 1965 | Ford | F-100 | 4WD | Manual | 5.8L | V8 | GAS | Lower | Curved Radiator Hose |
| 1965 | Ford | F-100 | — | Manual | 5.8L | V8 | GAS | Lower | w/o 4WD; Curved Radiator Hose |
| 1965 | Ford | F-250 | 4WD | Manual | 5.8L | V8 | GAS | Lower | Curved Radiator Hose |
| 1965 | Ford | F-250 | — | Manual | 5.8L | V8 | GAS | Lower | w/o 4WD; Curved Radiator Hose |
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