Gates 21739 Radiator Coolant Hose

Gates 21739 Molded Coolant Hose Overview

The Gates 21739 molded coolant hose is an OEM-style radiator coolant hose built from EPDM for dependable coolant transfer in select vehicle applications. It is shaped for direct routing at the radiator, tee, thermostat, engine, and heater-related connections where a formed hose is required.

Gates Molded Coolant Hose line covers upper, lower, bypass, heater, and other cooling-system routes with OE-level specifications, helping reduce the need to source a replacement from the dealer. This part number, 21739, is used across a wide range of import and domestic applications, including Audi A4, Volkswagen Passat, and Jeep Liberty fitments.

Key Features

• EPDM construction for coolant-system service
• Molded shape for proper hose routing
• 16 mm (0.62 in.) inside diameter at both ends
• 145 mm (5.7 in.) centerline length
• No spring, no modular sections, and no quick-connect fittings
• Direct replacement style for radiator and HVAC coolant/heater hose routing

Application Details

Compatible With select 1986-2011 vehicles, including Fits 1996-2001 Audi A4, N/A; Fits 1998-2001 Volkswagen Passat, N/A; Fits 2002-2006 Jeep Liberty, Engine To Pipe-1; and Fits 2007-2011 Lexus GS450h, Radiator To Tee. Additional coverage includes Chevrolet Uplander, Pontiac Montana, Saturn Relay, Buick Terraza, Mercury Sable, Toyota Celica, and other listed applications. The Gates 21739 is a molded coolant hose intended for radiator and HVAC coolant/heater hose routing where the original hose follows a formed path.

This part cross-references AP Exhaust 8430 for the same application.

Common Problems This Hose Can Address

• Cracked or hardened coolant hose material
• Coolant leaks at a molded hose section
• Poor hose routing after a failed replacement hose
• Restricted coolant flow caused by a deteriorated hose
• Service issues on radiator-to-tee, tee-to-thermostat, or engine-to-pipe routes

Installation Notes and Tips

Verify end diameters, centerline length, and routing before installation. Match the original hose path carefully, especially on vehicles with radiator and HVAC coolant/heater hose routing. Inspect adjoining clamps, tees, and pipe connections for wear or corrosion before installing the new hose. Confirm the vehicle-specific position listed in the fitment data, such as radiator to tee, pipe to tee, tee to thermostat, or engine to pipe.

Quality Assurance

Gates manufactures this molded coolant hose to OEM-quality specifications for the listed applications. The 21739 part number is part of Gates’ molded coolant hose line, which is built to cover a broad range of replacement cooling-system needs.