Gates 20687 Radiator Coolant Hose - Lower

Gates 20687 Molded Coolant Hose Overview

Gates 20687 is a molded radiator coolant hose built for lower hose applications that require an OEM-style shape and precise fit. Made from EPDM, it is formed to match the routing needed on select Buick, Chevrolet, Oldsmobile, and Pontiac vehicles.

This molded coolant hose is part of the Gates Molded Coolant Hose line, which covers upper, lower, bypass, heater, and other coolant routing needs with OE-style specifications. For lower radiator hose replacement on classic GM platforms, Gates 20687 helps simplify the repair with a direct-fit molded design.

Key Features

• Brand: Gates Molded Coolant Hose
• Part number: 20687
• Material: EPDM for coolant system service
• Molded construction for accurate hose routing
• End 1 inside diameter: 1.5 in. (38 mm)
• End 2 inside diameter: 1.75 in. (44 mm)
• Centerline length: 18.2 in. (462 mm)
• Lower hose application

Detailed Description

Gates 20687 is a molded lower radiator coolant hose for vehicles that need a formed replacement rather than a universal straight hose. Its EPDM construction is suited for coolant service, while the molded profile helps maintain the original hose path and connection geometry. This part cross-references Dayco 70649 for the same application.

Compatible With 1970-1981 Chevrolet Camaro, lower; 1978-1981 Buick Century, lower; 1978-1981 Pontiac Grand Prix, lower; and other listed Buick, Chevrolet, Oldsmobile, and Pontiac applications. Common search terms for this part include lower radiator hose for 1978-1981 Chevrolet Malibu, molded coolant hose for 1972-1981 Oldsmobile Cutlass, and replacement lower hose for 1977-1981 Pontiac Firebird.

What It Helps Address

• Cracked or aged lower radiator hose material
• Incorrect hose routing from a non-molded replacement
• Coolant leaks at the hose connection points
• Fitment issues on OE-shaped lower hose applications
• Service delays when sourcing a dealer-style replacement

Installation Notes and Tips

Verify end diameters, centerline length, and vehicle application before installation. Inspect hose clamps, thermostat housing, radiator necks, and adjacent cooling system components for wear or corrosion before fitting the new hose. Confirm the hose is routed without kinks or twist so coolant flow is not restricted.

Quality Assurance

Gates manufactures molded coolant hoses to OE-quality specifications for radiator, heater, bypass, and related cooling system applications. The 20687 is built as a molded replacement for listed fitments, including 1970-1981 Chevrolet Camaro, 1978-1981 Buick Regal, and 1972-1981 Oldsmobile Cutlass lower hose applications.