Gates 21577 Radiator Coolant Hose - Upper

Reliable Radiator Coolant Hose for Buick, Oldsmobile, Pontiac

The Gates Molded Coolant Hose 21577 is engineered to provide dependable cooling system performance for select Buick, Oldsmobile, and Pontiac vehicles. Designed with precision molding and durable EPDM material, this radiator coolant hose ensures consistent fit and function for models like the Firenza, Grand Am, Skyhawk, and Sunbird.

Key Features of Gates Molded Coolant Hose 21577

• Constructed from high-quality EPDM material for heat and chemical resistance
• Molded design for precise fit and reliable sealing
• Centerline length of 12 inches (305 mm) for accurate replacement
• End 1 and End 2 inside diameters both measure 1.25 inches (32 mm)
• Contains no internal spring, ensuring smooth coolant flow
• Compatible with Buick Firenza, Oldsmobile Cutlass, Pontiac Grand Am, Skyhawk, and Sunbird

About the Molded Coolant Hose Product Line

The Gates Molded Coolant Hose line focuses on delivering hoses that are pre-formed to exact specifications, reducing installation time and improving reliability. This product line uses EPDM rubber, known for its resistance to heat, ozone, and coolant chemicals, making it suitable for radiator applications in older GM vehicles. The molded construction helps maintain hose shape and prevents kinking under engine bay conditions.

Detailed Product Description

The Gates Molded Coolant Hose 21577 is a radiator coolant hose designed specifically for certain Buick, Oldsmobile, and Pontiac models. Made from EPDM, this hose withstands high temperatures and exposure to automotive coolants without degrading. Both ends of the hose have an inside diameter of 1.25 inches (32 mm), matching OEM specifications for a secure fit. The 12-inch (305 mm) centerline length ensures proper routing within the engine compartment. The hose does not contain an internal spring, which allows for unobstructed coolant flow and reduces the risk of hose collapse under vacuum conditions. Its molded design provides a precise shape that fits the intended vehicle models without modification.

Common Applications and Issues Addressed

• Replacement of worn or cracked radiator coolant hoses in Buick Firenza and Pontiac Grand Am
• Resolving coolant leaks caused by hose deterioration in Oldsmobile Skyhawk and Sunbird
• Preventing overheating issues due to compromised coolant flow
• Maintaining proper coolant system pressure and circulation
• Eliminating hose collapse or kinking in molded radiator hose applications

Installation Notes and Tips

Ensure the engine is cool before removing the old hose to avoid burns. Verify that the hose dimensions match the original part, especially the 1.25 inch (32 mm) inside diameters and 12 inch (305 mm) length. Use appropriate clamps to secure the hose ends and check for leaks after installation. The molded shape should align with the vehicle’s coolant routing without forcing or bending.

Quality Assurance and Warranty

Gates Molded Coolant Hose 21577 is manufactured to meet or exceed OEM standards for durability and performance. The EPDM material and molded construction provide resistance to heat, ozone, and coolant chemicals, ensuring long service life. While specific warranty details are not provided, Gates products typically come with a limited warranty against defects in material and workmanship.