Gates 51579 Radiator Coolant Hose - Upper

Reliable Radiator Coolant Hose for Audi A4 and A4 Quattro

The Gates Molded Coolant Hose 51579 is engineered to provide a precise fit and dependable performance for Audi A4 and A4 Quattro models. Designed with durable materials and molded construction, this radiator coolant hose ensures efficient coolant flow and system integrity.

• Constructed from EPDM, plastic, and steel for durability and heat resistance
• End 1 inside diameter: 1.25 inches (32 mm)
• End 2 inside diameter: 1.3 inches (33 mm)
• Centerline length of 16.5 inches (419 mm) for exact fitment
• Includes two quick connect fittings: female and male connectors
• Molded design for precise shape and secure connections
• Modular hose compatible with quick connect fittings
• Contains no internal spring, ensuring smooth coolant flow

About the Gates Molded Coolant Hose Product Line

The Molded Coolant Hose line by Gates focuses on delivering hoses that are pre-formed to match specific vehicle coolant system layouts. This reduces installation time and potential leaks by providing a hose that fits the contours of the engine bay precisely. The 51579 part benefits from this design approach, offering a molded shape with integrated quick connectors tailored for Audi A4 and A4 Quattro applications.

Detailed Product Description

This radiator coolant hose is manufactured using a combination of EPDM rubber, plastic, and steel components to withstand high temperatures and resist degradation from coolant chemicals. The hose features two different inside diameters at each end—1.25 inches (32 mm) and 1.3 inches (33 mm)—to match the specific radiator and engine fittings on compatible Audi models. With a centerline length of 16.5 inches (419 mm), the hose ensures proper routing without kinks or stress points. The inclusion of two quick connect fittings, one female and one male, facilitates secure and leak-free connections without the need for clamps or additional hardware. The molded construction guarantees consistent shape and fitment, reducing the risk of coolant leaks and system failures.

Common Applications and Issues Addressed

• Replacement of worn or cracked radiator coolant hoses on Audi A4 and A4 Quattro
• Resolving coolant leaks caused by hose deterioration or improper fit
• Preventing overheating issues due to compromised coolant flow
• Eliminating hose collapse or deformation under pressure
• Upgrading to a molded hose for improved durability and fitment

Installation Notes and Tips

Ensure the engine is cool before removing the old coolant hose to avoid burns. Verify that the quick connect fittings on the hose align correctly with the vehicle’s radiator and engine connectors. The molded shape of the hose should match the original routing path to prevent kinks or stress. Inspect all connection points for proper engagement to avoid leaks. It is recommended to replace coolant and inspect the entire cooling system during installation.

Quality Assurance and Warranty

Gates Molded Coolant Hose 51579 is manufactured to meet or exceed OEM specifications for fit, form, and function. The use of EPDM rubber and steel components ensures resistance to heat, pressure, and coolant chemicals. While specific warranty details are not provided, Gates products typically adhere to industry standards for quality and reliability.