Gates 21277 Radiator Coolant Hose - Upper

Overview of Gates Molded Coolant Hose 21277

The Gates Molded Coolant Hose 21277 is designed for reliable cooling system performance in select Buick, Chevrolet, Oldsmobile, and Pontiac vehicles. Engineered with EPDM material, this radiator coolant hose offers durability and precise fitment for models such as the Bonneville, Cutlass, and Monte Carlo.

• Constructed from durable EPDM material for heat and chemical resistance
• Molded design ensures exact fit and secure connections
• End 1 inside diameter: 1.25 inches (32 mm)
• End 2 inside diameter: 1.55 inches (39 mm)
• Centerline length of 26.5 inches (673 mm) for proper routing
• Contains no internal spring, providing consistent coolant flow
• Compatible with multiple GM models including Buick Regal and Pontiac Grand Prix

About the Molded Coolant Hose Product Line

The Gates Molded Coolant Hose line focuses on precision-molded radiator hoses designed to meet exact OEM specifications. This product line emphasizes consistent dimensions and material quality to maintain cooling system integrity. The molded construction of part number 21277 ensures a secure fit and reliable coolant transfer for the specified GM vehicles.

Detailed Product Description

This radiator coolant hose is made from EPDM, a synthetic rubber known for its resistance to heat, ozone, and coolant chemicals, making it suitable for long-term use in automotive cooling systems. The molded design eliminates the need for additional fittings or clamps beyond standard installation, reducing potential leak points. With a centerline length of 26.5 inches, the hose is engineered to fit the coolant routing requirements of Buick, Chevrolet, Oldsmobile, and Pontiac models such as the Cutlass Supreme and El Camino. The hose ends have different inside diameters—1.25 inches (32 mm) on one end and 1.55 inches (39 mm) on the other—to match the radiator and engine connections precisely.

Common Applications and Problem Solving

• Replacement of worn or cracked radiator coolant hoses
• Resolving coolant leaks caused by hose degradation
• Preventing overheating due to compromised coolant flow
• Restoring proper coolant circulation in Buick Regal and Chevrolet Monte Carlo
• Maintaining cooling system efficiency in Pontiac Grand Prix and Oldsmobile Delta 88

Installation Notes and Tips

Before installation, ensure the engine is cool and the cooling system is depressurized. Inspect hose connections for corrosion or damage and clean mating surfaces. Use appropriate clamps to secure the hose ends firmly without over-tightening, which can damage the hose. Verify the hose routing matches OEM specifications to avoid kinks or interference with other engine components. Part number 21277 is a direct replacement and requires no modification for compatible vehicles.

Quality Assurance and Warranty

Gates Molded Coolant Hose 21277 is manufactured to meet industry standards for durability and performance. The EPDM material and molded construction provide resistance to heat and coolant chemicals, contributing to long service life. While specific warranty details are not provided here, Gates products typically come with manufacturer-backed quality assurance to support reliable operation in Buick, Chevrolet, Oldsmobile, and Pontiac vehicles.