Gates 21666 Radiator Coolant Hose - Upper

Gates Molded Coolant Hose 21666

The Gates 21666 molded coolant hose is built for upper coolant routing with OEM-quality specifications. It uses EPDM construction and a molded shape to match the intended hose path for a cleaner, more accurate replacement.

Key Features

• EPDM rubber construction for coolant system service.
• Molded design follows the required hose routing.
• 1.38 in. and 1.63 in. end inside diameters for the specified connections.
• 10.4 in. centerline length for proper fitment geometry.
• No spring, no modular sections, and no quick-connect fittings.

Detailed Description

This radiator coolant hose is part of Gates’ Molded Coolant Hose line, a range focused on replacement hoses for upper, lower, bypass, heater, and other coolant applications. The 21666 is engineered as a molded replacement hose for Pontiac LeMans and Pontiac Optima applications that require an upper hose configuration. Gates 21666 is a practical choice when you need a formed hose that matches the original routing and connection sizes without adapting a universal hose.

This part cross-references Dayco 71363 and FEL-PRO 61586 for the same application.

What It Helps Solve

• Cracked or aged coolant hose material.
• Incorrect hose shape that does not follow the original routing.
• Leaks at the hose connection points.
• Fitment issues from using a universal hose in a formed application.

Installation Notes and Tips

Fits 1988-1993 Pontiac LeMans, upper. Fits 1988-1991 Pontiac Optima, upper. Confirm the hose path, end diameters, and centerline length before installation. Inspect clamps, necks, and adjacent cooling system components for wear or corrosion before reassembly.

Quality Assurance

Gates molded coolant hoses are manufactured to OEM-quality specifications for replacement cooling system service.