OE Quality
60-Day Returns

Gates 20427 Radiator Coolant Hose - Lower
Reliable Radiator Coolant Hose for Pontiac Bonneville and Catalina
The Gates Molded Coolant Hose 20427 is engineered to provide dependable cooling system performance for Pontiac Bonneville and Catalina models. Designed with durable EPDM material, this radiator coolant hose ensures consistent heat resistance and flexibility under demanding engine conditions.
- Constructed from high-quality EPDM material for heat and chemical resistance
- Molded design for precise fit and secure connections
- Inside diameter of 2 inches (51 mm) on both ends for consistent coolant flow
- Centerline length of 21.2 inches (538 mm) to match specific vehicle requirements
- Does not contain a spring or quick connect fittings, ensuring a straightforward installation
About the Gates Molded Coolant Hose Product Line
The Molded Coolant Hose line by Gates focuses on delivering hoses that are pre-formed to exact specifications, reducing the need for adjustments during installation. This product line emphasizes durability and fitment accuracy, which helps maintain optimal coolant flow and system integrity in vehicles like the Pontiac Bonneville and Catalina. The molded construction of part number 20427 ensures a reliable seal and consistent performance over time.
Product Details and Specifications
This radiator coolant hose features an inside diameter of 2 inches (51 mm) on both ends, making it compatible with the cooling system connections of Pontiac Bonneville and Catalina vehicles. The hose measures 21.2 inches (538 mm) in centerline length, designed to fit precisely without the need for modification. Made from EPDM, the hose resists heat, ozone, and coolant chemicals, contributing to long service life. The absence of springs and quick connect fittings simplifies the hose design, focusing on durability and ease of maintenance.
Common Applications and Problem Solving
- Replacement of worn or cracked radiator coolant hoses in Pontiac Bonneville and Catalina
- Resolving coolant leaks caused by hose degradation or damage
- Maintaining proper coolant flow to prevent engine overheating
- Ensuring secure connections in the cooling system without spring interference
- Upgrading to a molded hose for improved fit and reduced installation time
Installation Notes and Tips
When installing the Gates Molded Coolant Hose 20427, ensure the engine is cool to avoid burns from hot coolant. Verify that the hose diameter and length match the vehicle’s specifications before installation. Use appropriate clamps to secure the hose ends firmly to prevent leaks. The molded design allows for straightforward alignment with existing cooling system ports on Pontiac Bonneville and Catalina models.
Quality Assurance and Warranty
Gates manufactures the Molded Coolant Hose 20427 to meet industry standards for durability and performance. The EPDM material and molded construction contribute to resistance against heat and chemical exposure. While specific warranty details are not provided, Gates products typically adhere to strict quality control processes to ensure reliability in automotive cooling systems.
| Brand | Gates |
| Part Number | 20427 |
| Position | Molded Coolant Hose, Lower |
| Material | Epdm |
| End 1 Inside Diameter | 2 |
| End 1 Inside Diameter | 51 |
| End 2 Inside Diameter | 2 |
| End 2 Inside Diameter | 51 |
| Contains Spring | No |
| Centerline Length | 21.2 |
| Centerline Length | 538 |
| Branch Quantity | 0 |
| 9839 | Yes |
| 9845 | 0 |
| Modular Hose | No |
| Molded | Yes |
| Number of Quick Connect Fittings | 0 |
This part fits 4 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|
| 1960 | Pontiac | Bonneville | 6.4L | V8 | GAS | Lower | Radiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose |
| 1960 | Pontiac | Catalina | 6.4L | V8 | GAS | Lower | Radiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose |
| 1959 | Pontiac | Bonneville | 6.4L | V8 | GAS | Lower | Radiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose |
| 1959 | Pontiac | Catalina | 6.4L | V8 | GAS | Lower | Radiator and HVAC compatible coolant and heater hose.; Molded Coolant 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.