Gates 20521 Radiator Coolant Hose

Gates 20521 Molded Coolant Hose Overview

The Gates 20521 molded coolant hose is built for radiator coolant service with OEM-quality specifications and a formed shape that matches the original routing. It is made from EPDM for dependable coolant-system performance on a wide range of classic Buick, Chevrolet, GMC, Oldsmobile, Pontiac, and Jeep applications.

Compatible With 1964-1984 Buick LeSabre, Regal, Century, Skylark, and Riviera; 1973-1984 Chevrolet Caprice, El Camino, Impala, Malibu, Monte Carlo, Camaro, Monza, S10, and S10 Blazer; and other listed vehicles, this hose supports direct replacement needs where a molded W/S-shaped coolant hose is required. Part number 20521 is also referenced across multiple aftermarket catalogs for the same application.

Key Features

• EPDM construction for coolant-system durability
• Molded hose shape for original-style routing
• 15 mm inside diameter at both ends
• 122 mm centerline length
• No spring, no modular sections, and no quick-connect fittings
• Designed for upper, lower, bypass, heater, and other coolant applications

Detailed Product Description

Gates Molded Coolant Hose line is built to replace formed radiator and heater hoses with OEM-style dimensions and fitment. The Gates 20521 uses EPDM material and a molded profile to match the routing needed on many GM passenger cars and light trucks, including Pontiac Grand Prix, Oldsmobile Cutlass, Buick LeSabre, and Jeep CJ5 and Wagoneer listings. For buyers searching for a molded radiator coolant hose for 1984 Chevrolet Caprice or a replacement coolant hose for 1977-1982 Pontiac Grand LeMans, this part number provides a direct-match option within the cataloged applications.

This part cross-references Dayco 70459 and 70619 for the same application.

What It Helps Replace

• Cracked or hardened radiator coolant hose material
• Collapsed or misshaped formed hose routing
• Coolant leaks at a worn hose section
• Incorrect fit from a universal hose replacement
• Service delays when an OE-style molded hose is needed

Installation Notes and Tips

Verify hose routing, end diameters, and centerline length before installation. This molded hose is listed for multiple positions and coolant-system uses, so match the vehicle application and note details such as W/S-shaped hose or Canada-specific fitment where shown. Inspect adjoining necks, clamps, and coolant passages before installing Gates 20521 to help ensure a proper seal.

Quality Assurance

Gates manufactures this molded coolant hose to OEM-quality specifications for replacement use in radiator and heater hose applications. The brand’s molded coolant hose line is positioned as a broad replacement catalog for formed cooling-system hoses across many vehicle platforms.