Gates 21659 Radiator Coolant Hose - Upper

Reliable Radiator Coolant Hose for Chevrolet and GMC Vehicles

The Gates Molded Coolant Hose 21659 is engineered to provide a durable and precise fit for select Chevrolet and GMC models. Designed with quality EPDM material, this radiator coolant hose ensures efficient coolant flow and long-lasting performance in demanding engine environments.

• Constructed from high-quality EPDM material for heat and chemical resistance
• Molded design for exact fit and secure installation
• End 1 inside diameter: 1.26 inches (32 mm)
• End 2 inside diameter: 1.5 inches (38 mm)
• Centerline length: 29.4 inches (747 mm)
• Compatible with Chevrolet and GMC R20, R20 Suburban, R30, R2500, R2500 Suburban, R3500, V20 Suburban, V30, and V3500 models
• Does not contain a spring or quick connect fittings

About the Gates Molded Coolant Hose Product Line

The Molded Coolant Hose line by Gates focuses on precision-engineered hoses that are molded to exact specifications for specific vehicle applications. This approach ensures a reliable seal and fitment, reducing the risk of leaks and premature wear. The molded construction of part number 21659 supports consistent coolant flow and durability under typical operating conditions for Chevrolet and GMC trucks and SUVs.

Detailed Product Description

The Gates 21659 radiator coolant hose is made from EPDM, a synthetic rubber known for its resistance to heat, ozone, and automotive fluids. Its molded design eliminates the need for additional clamps or fittings, providing a secure connection between the radiator and engine cooling system. With a centerline length of 29.4 inches (747 mm), this hose is tailored to fit specific Chevrolet and GMC models, including R20 and R2500 series trucks and Suburban variants. The hose features two different inside diameters—1.26 inches (32 mm) on one end and 1.5 inches (38 mm) on the other—to accommodate varying connection points within the cooling system.

Common Applications and Issues Addressed

• Replacement of worn or cracked radiator coolant hoses
• Prevention of coolant leaks that can lead to engine overheating
• Restoration of proper coolant flow in Chevrolet and GMC R20 and R2500 models
• Addressing hose swelling or softening due to heat exposure
• Ensuring secure connections without the need for springs or quick connect fittings

Installation Notes and Tips

Before installation, ensure the engine is cool to avoid injury from hot coolant. Inspect the radiator and engine fittings for corrosion or damage. The molded design of the Gates 21659 hose allows for straightforward installation without additional clamps or springs. Verify that the hose is properly seated on both ends to prevent leaks. It is recommended to replace any worn clamps or seals during installation to maintain system integrity.

Quality Assurance and Warranty

Gates manufactures the Molded Coolant Hose 21659 to meet or exceed OEM specifications for durability and performance. The EPDM material and molded construction provide resistance to heat, pressure, and automotive fluids. While specific warranty details are not provided here, Gates products typically come with a limited warranty against defects in material and workmanship. Consult the product packaging or manufacturer for exact warranty terms.