Gates 51378 Radiator Coolant Hose - Heater Outlet

Reliable Radiator Coolant Hose for Audi A4 and A4 Quattro

The Gates Molded Coolant Hose 51378 is engineered to provide a durable and precise fit for Audi A4 and A4 Quattro models. Designed with quality materials and molded construction, this radiator coolant hose ensures efficient coolant flow and system reliability.

• Constructed from EPDM and plastic for heat and chemical resistance
• End 1 inside diameter: 0.7 inches (18 mm)
• End 2 inside diameter: 0.88 inches (22 mm)
• Centerline length of 19.75 inches (502 mm)
• Includes one female quick connector fitting
• Molded design for exact fit and leak prevention
• Modular hose compatible with quick connect systems

About the Gates Molded Coolant Hose Product Line

The Molded Coolant Hose line by Gates focuses on precision-molded hoses that integrate modular components such as quick connectors. This design approach enhances installation efficiency and ensures a secure, leak-resistant connection within the cooling system. The 51378 part exemplifies this with its molded construction and female quick connector, tailored for specific Audi models.

Detailed Product Description

This radiator coolant hose is made from EPDM rubber combined with plastic components, providing resistance to heat, ozone, and coolant chemicals. The molded construction guarantees a precise shape that matches the original equipment specifications for Audi A4 and A4 Quattro vehicles. With a centerline length of 19.75 inches (502 mm), it fits seamlessly into the cooling system, maintaining optimal coolant flow. The hose features two different inside diameters at each end—0.7 inches (18 mm) and 0.88 inches (22 mm)—to accommodate specific radiator and engine connections. The inclusion of a female quick connector fitting simplifies installation and ensures a secure, modular connection without the need for additional clamps or adapters.

Common Applications and Problem Solving

• Replacement of worn or cracked radiator coolant hoses in Audi A4 and A4 Quattro
• Resolving coolant leaks caused by hose degradation or improper fit
• Maintaining proper coolant flow to prevent engine overheating
• Upgrading to a molded hose with quick connect fitting for easier maintenance
• Ensuring compatibility with factory cooling system components

Installation Notes and Tips

When installing the Gates Molded Coolant Hose 51378, ensure the vehicle is cool and the cooling system is depressurized. Verify the hose orientation matches the original routing to avoid kinks or stress points. The female quick connector should securely snap into place; confirm a tight connection to prevent leaks. Inspect all clamps and adjacent components for wear during installation. Proper installation will maintain system integrity and coolant circulation.

Quality Assurance and Warranty

Gates manufactures the Molded Coolant Hose 51378 to meet or exceed OEM standards for durability and performance. The use of EPDM and plastic materials ensures resistance to heat and chemical exposure typical in automotive cooling systems. While specific warranty details are not provided here, Gates products generally come with a limited warranty against defects in material and workmanship. Refer to Gates documentation for exact warranty terms.