Gates 21644 Radiator Coolant Hose - Upper

Reliable Radiator Coolant Hose for Chevrolet and GMC Trucks

The Gates Molded Coolant Hose 21644 is engineered to provide dependable cooling system performance for select Chevrolet and GMC truck models. Designed with durable EPDM material and precise molded construction, this radiator coolant hose ensures a secure fit and long-lasting service.

• Constructed from high-quality EPDM material for heat and chemical resistance
• Molded design for exact fit and reliable sealing
• End 1 inside diameter: 1.25 inches (32 mm)
• End 2 inside diameter: 1.5 inches (38 mm)
• Centerline length of 26.4 inches (671 mm) for proper routing
• Compatible with Chevrolet and GMC C20, C20 Suburban, C30, C2500, C2500 Suburban, C3500, K20 Suburban, K30, K3500, R30, R3500, V30, and V3500 models

About the Gates Molded Coolant Hose Product Line

The Molded Coolant Hose line by Gates focuses on precision-molded radiator hoses designed to meet exact OEM specifications. This product line emphasizes durability and fitment accuracy, reducing the risk of leaks and coolant loss. The molded construction of part number 21644 ensures consistent performance and compatibility with specific Chevrolet and GMC truck cooling systems.

Product Details and Specifications

This radiator coolant hose is made from EPDM, a synthetic rubber known for its excellent resistance to heat, ozone, and automotive fluids. The hose features two different inside diameters—1.25 inches (32 mm) on one end and 1.5 inches (38 mm) on the other—allowing it to connect different components within the cooling system securely. With a centerline length of 26.4 inches (671 mm), it is designed to fit the routing requirements of the specified truck models without modification. The hose does not contain any internal springs or quick connect fittings, ensuring a straightforward installation.

Common Applications and Problem Solving

• Replacement of worn or cracked radiator coolant hoses in Chevrolet and GMC trucks
• Prevention of coolant leaks caused by hose degradation or swelling
• Restoration of proper coolant flow to maintain engine temperature regulation
• Addressing overheating issues related to faulty or damaged radiator hoses
• Ensuring secure connections between radiator and engine components

Installation Notes and Tips

Before installation, verify the hose dimensions and compatibility with your specific Chevrolet or GMC truck model. Ensure the cooling system is cool and depressurized to avoid injury. Remove the old hose carefully, inspecting clamps and fittings for wear. Install the Gates Molded Coolant Hose 21644 by aligning the correct ends with the corresponding radiator and engine ports. Secure clamps firmly but avoid overtightening to prevent hose damage. After installation, refill the cooling system and check for leaks during engine warm-up.

Quality Assurance and Warranty

Gates manufactures the Molded Coolant Hose 21644 to meet stringent quality standards, ensuring reliable performance in demanding automotive environments. The EPDM material and molded design contribute to the hose's durability and resistance to common coolant system stresses. While specific warranty details are not provided, Gates products typically adhere to industry quality controls and are backed by the brand's reputation for automotive component reliability.