OE Quality
60-Day Returns

Dayco 70670 Radiator Coolant Hose - Lower or Upper
Overview of Dayco Curved Radiator Hose 70670
The Dayco Curved Radiator Hose 70670 is designed to provide reliable coolant flow for select BMW, Ford, and Jeep vehicles. Engineered with durable EPDM material, this radiator coolant hose ensures consistent performance under typical operating conditions.
- Constructed from high-quality EPDM for heat and chemical resistance
- Black color with a curved design for precise fitment
- Inside diameter of 1 9/16 inches on both ends
- Meets SAE J20R4 Class D-1 and SAE J1684 Type EC specifications
- Single inside diameter hose without heat shield or protective sleeve
- Trunk height dimension of 14 inches
Detailed Product Description
This Dayco Curved Radiator Hose 70670 is a single inside diameter hose made from EPDM, a synthetic rubber known for its resistance to heat, ozone, and coolant chemicals. The hose features a consistent 1 9/16 inch inside diameter on both ends, ensuring a secure connection to the radiator and engine components. Its black color and curved shape are designed to match the original equipment specifications for proper routing and fitment.
Complying with SAE J20R4 Class D-1 and SAE J1684 Type EC standards, this hose meets industry requirements for durability and performance in automotive cooling systems. The absence of a heat shield or protective sleeve indicates it is intended for applications where additional protection is not necessary.
Compatible Vehicles and Applications
This radiator coolant hose is compatible with various BMW, Ford, and Jeep models, including BMW 525i and 525iT, Ford Courier, and Jeep Cherokee, Grand Wagoneer, J10, and Wagoneer. It is designed to replace worn or damaged radiator hoses in these vehicles, maintaining proper coolant flow and engine temperature regulation.
- Replaces cracked or leaking radiator hoses
- Prevents coolant loss and overheating issues
- Restores proper coolant circulation in the radiator system
- Addresses hose swelling or softening due to age or heat exposure
- Ensures secure connections to radiator and engine fittings
Installation Notes and Tips
When installing the Dayco Curved Radiator Hose 70670, ensure the engine is cool to avoid burns from hot coolant. Verify that the hose routing matches the original configuration to prevent kinks or interference with other engine components. Use appropriate clamps to secure the hose ends firmly, and inspect all connections for leaks after installation.
Quality Assurance and Warranty
Dayco manufactures the Curved Radiator Hose 70670 to meet strict SAE specifications, ensuring reliable performance in automotive cooling systems. While specific warranty details are not provided, Dayco products typically adhere to industry standards for quality and durability.
| Brand | Dayco |
|---|---|
| Part Number | 70670 |
| Position | Curved Radiator Hose, Upper |
| Color | Black |
| End 1 Inside Diameter | 1 9/16 |
| End 2 Inside Diameter | 1 9/16 |
| Hose Type | Single I.D. Hose |
| Material | EPDM |
| SAE Specification | SAE J20R4 Class D-1, SAE J1684 Type EC |
| Trunk Height | 14 |
This part fits 27 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1995 | BMW | 525i | Upper | Curved Radiator Hose | ||
| 1994 | BMW | 525i | Upper | Curved Radiator Hose | ||
| 1993 | BMW | 525i | Upper | Curved Radiator Hose | ||
| 1993 | BMW | 525iT | Upper | Curved Radiator Hose | ||
| 1992 | BMW | 525i | Upper | Curved Radiator Hose | ||
| 1991 | BMW | 525i | Upper | Curved Radiator Hose | ||
| 1987 | Jeep | J10 | 4.2L | L6 | Upper | Curved Radiator Hose |
| 1986 | Jeep | Grand Wagoneer | 4.2L | L6 | Upper | Curved Radiator Hose |
| 1986 | Jeep | J10 | 4.2L | L6 | Upper | Curved Radiator Hose |
| 1985 | Jeep | Grand Wagoneer | 4.2L | L6 | Upper | Curved Radiator Hose |
| 1985 | Jeep | J10 | 4.2L | L6 | Upper | Exc. Calif.; Curved Radiator Hose |
| 1984 | Jeep | Grand Wagoneer | 4.2L | L6 | Upper | Curved Radiator Hose |
| 1984 | Jeep | J10 | 4.2L | L6 | Upper | Curved Radiator Hose |
| 1983 | Jeep | Cherokee | 4.2L | L6 | Upper | Curved Radiator Hose |
| 1983 | Jeep | J10 | 4.2L | L6 | Upper | Curved Radiator Hose |
| 1983 | Jeep | Wagoneer | 4.2L | L6 | Upper | Curved Radiator Hose |
| 1982 | Jeep | Cherokee | 4.2L | L6 | Upper | Curved Radiator Hose |
| 1982 | Jeep | J10 | 4.2L | L6 | Upper | Curved Radiator Hose |
| 1982 | Jeep | Wagoneer | 4.2L | L6 | Upper | Curved Radiator Hose |
| 1981 | Jeep | Cherokee | 4.2L | L6 | Upper | Curved Radiator Hose |
| 1981 | Jeep | J10 | 4.2L | L6 | Upper | Curved Radiator Hose |
| 1981 | Jeep | Wagoneer | 4.2L | L6 | Upper | Curved Radiator Hose |
| 1976 | Ford | Courier | Lower | Curved Radiator Hose | ||
| 1975 | Ford | Courier | Lower | Curved Radiator Hose | ||
| 1974 | Ford | Courier | 1.8L | L4 | Lower | Curved Radiator Hose |
| 1973 | Ford | Courier | 1.8L | L4 | Lower | Curved Radiator Hose |
| 1972 | Ford | Courier | 1.8L | L4 | Lower | 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.