Gates 21742 Radiator Coolant Hose

Gates 21742 Molded Coolant Hose Overview

Gates 21742 is a molded radiator coolant hose built to OEM-quality specifications for coolant and heater routing. It is formed from EPDM and shaped for direct replacement in applications that require a 16 mm inside diameter at both ends and a 122 mm centerline length.

The Gates Molded Coolant Hose line covers upper, lower, bypass, heater, and other cooling-system routes, giving technicians a direct-fit option for radiator hose replacement on vehicles such as Toyota Tacoma, Chevrolet Colorado, and GMC Canyon applications.

Key Features

• EPDM construction for coolant-system service
• Molded shape for routing accuracy
• 16 mm inside diameter at both ends
• 122 mm centerline length
• No spring and no quick-connect fittings
• Direct replacement for heater and radiator coolant hose applications

Application Details

Gates 21742 is a molded coolant hose used in heater outlet, auxiliary heater inlet, pipe-to-engine, tee-to-pipe, inverter cooling, return, and pipe-to-pipe routing positions. It is listed for 2021 and 2016-2018 Toyota Tacoma heater outlet applications, 2008-2012 Chevrolet Colorado pipe-1 to engine applications, and 2008-2012 GMC Canyon pipe-1 to engine applications. Additional coverage includes 2007-2011 Lexus GS450h, 2003-2008 Honda Pilot, 2001-2006 Acura MDX, and other listed vehicles.

This part cross-references Four Seasons 86073 and AP Exhaust 8433 for the same application. The Gates 21742 part number is also used across multiple interchange references for radiator and HVAC coolant hose service.

Common Problems It Can Address

• Cracked or hardened coolant hose material
• Leaks at molded hose routing points
• Incorrect hose shape after prior repairs
• Restricted coolant flow from a deteriorated hose
• Service issues on heater outlet or engine pipe connections

Installation Notes

Verify hose routing, end diameters, and centerline length before installation. Match the molded shape to the original hose path and confirm the connection points are clean and free of debris. For fitment-specific service, confirm the vehicle year, make, model, and position against the listed applications before replacement.

Quality Assurance

Gates manufactures molded coolant hoses to OEM-quality specifications for radiator and heater hose replacement. The 21742 is part of Gates’ molded coolant hose line, which is built to cover a wide range of cooling-system applications with application-specific fitment.