OE Quality
60-Day Returns

Dayco 70786 Radiator Coolant Hose - Lower, Upper or Upper - Pipe To Radiator
Overview of Dayco Curved Radiator Hose 70786
The Dayco Curved Radiator Hose 70786 is designed for reliable coolant flow in select Ford, Mazda, and Toyota vehicles. Engineered with durable EPDM material, this radiator coolant hose ensures consistent performance in demanding engine environments.
- Constructed from high-quality EPDM for heat and chemical resistance
- Black color with a curved design for precise fitment
- Inside diameter of 1 1/2 inches on both ends for uniform coolant flow
- Meets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
- Single inside diameter hose type with 18-inch trunk height
- Compatible with Ford Bronco, Mazda MPV, and Toyota Previa models
Details on the Curved Radiator Hose Product Line
The Dayco Curved Radiator Hose line focuses on providing hoses with specific bends and dimensions to match OEM configurations. This product line is engineered to maintain coolant system integrity by ensuring proper routing and fitment, reducing stress on connections and improving overall cooling efficiency. The 70786 part exemplifies this with its precise 1 1/2 inch inside diameters and curved shape tailored for select vehicle applications.
Product Description and Specifications
This radiator coolant hose is made from EPDM, a synthetic rubber known for its resistance to heat, ozone, and coolant chemicals, making it suitable for automotive cooling systems. The hose features a consistent 1 1/2 inch inside diameter on both ends, facilitating smooth coolant flow without restriction. It does not include a heat shield or protective sleeve, focusing on a straightforward, durable design. The hose complies with SAE J20R4 Class D-1 and SAE J1684 Type EC standards, ensuring it meets industry requirements for coolant hoses.
Compatible Vehicles and Common Applications
- Replacement radiator hose for Ford Bronco models requiring a 1 1/2 inch curved hose
- Suitable for Mazda MPV vehicles needing a reliable coolant hose with specific bend and length
- Fits Toyota Previa models where a curved radiator hose with these dimensions is specified
- Addresses issues such as coolant leaks, hose cracking, and coolant flow restrictions
- Helps maintain proper engine temperature by ensuring coolant system integrity
Installation Notes and Tips
Before installation, verify the hose dimensions and curvature match the vehicle’s OEM specifications. Ensure all clamps and connections are secure to prevent leaks. It is recommended to inspect the cooling system for any additional wear or damage during replacement. The hose should be installed without twisting or stretching to maintain its designed shape and function.
Quality Assurance and Warranty
Dayco manufactures this radiator hose to meet SAE standards, providing assurance of material and performance quality. While specific warranty details are not provided, Dayco products typically adhere to industry quality controls to support durability and reliability in automotive cooling systems.
| Brand | Dayco |
| Part Number | 70786 |
| Position | Curved Radiator Hose, Lower |
| Color | Black |
| End 1 Inside Diameter | 1 1/2 |
| End 2 Inside Diameter | 1 1/2 |
| Hose Type | Single I.D. Hose |
| Material | EPDM |
| SAE Specification | SAE J20R4 Class D-1, SAE J1684 Type EC |
| Trunk Height | 18 |
This part fits 29 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2006 | Mazda | MPV | Lower | Curved Radiator Hose | ||
| 2005 | Mazda | MPV | Lower | Curved Radiator Hose | ||
| 2004 | Mazda | MPV | Lower | Curved Radiator Hose | ||
| 2003 | Mazda | MPV | Lower | Curved Radiator Hose | ||
| 2002 | Mazda | MPV | Lower | Curved Radiator Hose | ||
| 1997 | Toyota | Previa | Upper - Pipe To Radiator | Curved Radiator Hose | ||
| 1996 | Toyota | Previa | Upper - Pipe To Radiator | Curved Radiator Hose | ||
| 1995 | Toyota | Previa | Upper - Pipe To Radiator | Curved Radiator Hose | ||
| 1994 | Toyota | Previa | Upper - Pipe To Radiator | Curved Radiator Hose | ||
| 1993 | Toyota | Previa | Upper - Pipe To Radiator | Curved Radiator Hose | ||
| 1992 | Toyota | Previa | Upper - Pipe To Radiator | Curved Radiator Hose | ||
| 1991 | Toyota | Previa | Upper - Pipe To Radiator | Curved Radiator Hose | ||
| 1977 | Ford | Bronco | Upper | Curved Radiator Hose | ||
| 1976 | Ford | Bronco | Upper | Curved Radiator Hose | ||
| 1975 | Ford | Bronco | Upper | Curved Radiator Hose | ||
| 1974 | Ford | Bronco | 5.0L | V8 | Upper | Curved Radiator Hose |
| 1974 | Ford | Bronco | Upper | Curved Radiator Hose | ||
| 1973 | Ford | Bronco | 5.0L | V8 | Upper | Curved Radiator Hose |
| 1973 | Ford | Bronco | Upper | Curved Radiator Hose | ||
| 1972 | Ford | Bronco | 5.0L | V8 | Upper | Curved Radiator Hose |
| 1972 | Ford | Bronco | Upper | Curved Radiator Hose | ||
| 1971 | Ford | Bronco | 5.0L | V8 | Upper | Curved Radiator Hose |
| 1971 | Ford | Bronco | Upper | Curved Radiator Hose | ||
| 1970 | Ford | Bronco | 5.0L | V8 | Upper | Curved Radiator Hose |
| 1970 | Ford | Bronco | Upper | Curved Radiator Hose | ||
| 1969 | Ford | Bronco | 5.0L | V8 | Upper | Curved Radiator Hose |
| 1969 | Ford | Bronco | Upper | Curved Radiator Hose | ||
| 1968 | Ford | Bronco | 5.0L | V8 | Upper | Curved Radiator Hose |
| 1968 | Ford | Bronco | Upper | Curved Radiator Hose |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.