OE Quality
60-Day Returns

Gates 21203 Radiator Coolant Hose - Upper or Upper - Tee To Thermostat
Overview of Gates Molded Coolant Hose 21203
The Gates Molded Coolant Hose 21203 is designed specifically for Volkswagen Golf and Jetta models. Constructed from durable EPDM material, this radiator coolant hose ensures reliable performance and long service life in your vehicle's cooling system.
- Made from high-quality EPDM rubber for heat and chemical resistance
- Molded design for precise fit and leak prevention
- Compatible with Volkswagen Golf and Jetta models
- Centerline length of 11.4 inches (290 mm) for exact fitment
- Consistent 1.5 inch (38 mm) inside diameter on both ends
- Does not contain internal springs or quick connect fittings
Detailed Product Description
The Gates Molded Coolant Hose 21203 is engineered to meet the specific cooling system requirements of Volkswagen Golf and Jetta vehicles. Its EPDM construction offers excellent resistance to heat, ozone, and coolant chemicals, which helps maintain hose integrity under demanding engine conditions. The molded design ensures a precise shape and fit, reducing the risk of leaks and improving coolant flow efficiency. Both ends of the hose have an inside diameter of 1.5 inches (38 mm), making it compatible with standard radiator connections on these models. With a centerline length of 11.4 inches (290 mm), this hose fits accurately without the need for modifications.
About the Molded Coolant Hose Product Line
The Molded Coolant Hose line by Gates focuses on delivering hoses that are pre-formed to exact specifications for specific vehicle applications. This eliminates the need for bending or shaping during installation, ensuring a secure and leak-free connection. The 21203 part number is part of this line, providing a reliable replacement option for Volkswagen Golf and Jetta cooling systems.
Common Applications and Problem Solving
- Replacement of cracked or leaking radiator coolant hoses
- Resolving coolant leaks that cause engine overheating
- Addressing hose swelling or softening due to heat exposure
- Upgrading worn or deteriorated hoses to maintain cooling efficiency
- Ensuring proper coolant flow in Volkswagen Golf and Jetta models
Installation Notes and Tips
When installing the Gates Molded Coolant Hose 21203, ensure the engine is cool to prevent burns or injury. Verify that the hose diameter and length match the original part to avoid fitment issues. Use appropriate clamps to secure the hose ends firmly, preventing leaks. Inspect surrounding components for wear or damage during installation to maintain overall cooling system integrity.
Quality Assurance and Warranty
Gates manufactures the Molded Coolant Hose 21203 to meet strict quality standards, ensuring durability and performance. The EPDM material and molded construction contribute to long-lasting service life. While specific warranty details are not provided, Gates products typically adhere to industry standards for reliability and customer satisfaction.
| Brand | Gates |
| Part Number | 21203 |
| Position | Molded Coolant Hose, Upper and Upper - Tee To Thermostat |
| Material | Epdm |
| End 1 Inside Diameter | 1.5 |
| End 1 Inside Diameter | 38 |
| End 2 Inside Diameter | 1.5 |
| End 2 Inside Diameter | 38 |
| Contains Spring | No |
| Centerline Length | 11.4 |
| Centerline Length | 290 |
| Branch Quantity | 0 |
| 9839 | Yes |
| 9845 | 0 |
| Modular Hose | No |
| Molded | Yes |
| Number of Quick Connect Fittings | 0 |
This part fits 11 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Fuel Type | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2005 | Volkswagen | Golf | 2.8L | V6 | GAS | Upper - Tee To Thermostat | Radiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose |
| 2004 | Volkswagen | Golf | 2.8L | V6 | GAS | Upper - Tee To Thermostat | Radiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose |
| 2004 | Volkswagen | Jetta | 2.8L | V6 | GAS | Upper - Tee To Thermostat | Radiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose |
| 2003 | Volkswagen | Golf | 2.8L | V6 | GAS | Upper - Tee To Thermostat | Radiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose |
| 2003 | Volkswagen | Jetta | 2.8L | V6 | GAS | Upper - Tee To Thermostat | Radiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose |
| 2002 | Volkswagen | Golf | 2.8L | V6 | GAS | Upper - Tee To Thermostat | W/O Quick Connect Fitting; Cut to fit; Molded Coolant Hose |
| 2002 | Volkswagen | Jetta | 2.8L | V6 | GAS | Upper - Tee To Thermostat | Radiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose |
| 2001 | Volkswagen | Golf | 2.8L | V6 | GAS | Upper - Tee To Thermostat | Radiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose |
| 2001 | Volkswagen | Jetta | 2.8L | V6 | GAS | Upper - Tee To Thermostat | Radiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose |
| 2000 | Volkswagen | Golf | 2.8L | V6 | GAS | Upper - Tee To Thermostat | Radiator and HVAC compatible coolant and heater hose.; Molded Coolant Hose |
| 2000 | Volkswagen | Jetta | 2.8L | V6 | GAS | Upper - Tee To Thermostat | 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.