Gates 18774 HVAC Heater Hose

Gates 18774 Molded Heater Hose Overview

The Gates 18774 molded heater hose is an OEM-style coolant hose built for tight engine bays and factory routing. With a 17.5-inch centerline length and 16 mm inside diameter at both ends, it supports clean, formed-fit heater and coolant connections in a wide range of vehicles.

Gates Molded Heater Hose products are shaped to follow original hose paths, helping maintain proper clearance in compact HVAC and cooling layouts. This hose is made from EPDM and is approved for coolant, water, air, and marine applications.

Key Features

• Factory-molded design for tighter engine compartments
• EPDM construction for heater and coolant service
• 16 mm inside diameter at both ends
• 17.5-inch centerline length for formed routing
• Suitable for coolant, water, and air applications
• Approved for marine applications
• Direct-fit style for many heater inlet and heater-to-pipe locations

Detailed Product Description

Gates 18774 is a molded heater hose designed to match OEM-style routing where a straight hose will not fit correctly. Its formed shape helps it follow the original path between heater components, auxiliary heater pipes, valves, and engine-side connections. This makes it a practical replacement for vehicles such as the Buick Enclave, Chevrolet Traverse, and GMC Acadia, as well as many older import and domestic applications.

Fitment includes positions such as heater inlet, heater outlet, heater to pipe, heater to valve, and tee-to-auxiliary heater pipe connections. This part cross-references Dayco 86104 and Four Seasons 63089 for the same application. The Gates 18774 part number is also listed among interchange references for multiple OE-style replacement needs.

Common Problems This Hose Can Address

• Cracked or leaking heater hose at a molded bend
• Collapsed hose routing in a tight engine compartment
• Coolant seepage at heater inlet or outlet connections
• Improper fit from a universal straight hose
• Restricted heater flow caused by a damaged formed hose

Installation Notes and Fitment Tips

• Fits 2008-2017 Buick Enclave, Tee-2 To Auxiliary Heater Pipe-2
• Fits 2009-2014 Chevrolet Traverse, Tee-2 To Auxiliary Heater Pipe-2
• Fits 2007-2014 GMC Acadia, Tee-2 To Auxiliary Heater Pipe-2
• Fits 2007-2010 Dodge Ram 2500, Heater Inlet
• Fits 2007-2010 Dodge Ram 3500, Heater Inlet
• Fits 2001-2006 Kia Magentis, Heater To Pipe-1
• Fits 2001-2006 Kia Optima, Heater To Pipe-1
• Fits 2002-2005 Hyundai Sonata, Heater To Pipe-1
• Fits 1995-1999 Mitsubishi Eclipse, Heater To Pipe-1
• Fits 1989-1995 Ford Taurus, Heater To Pipe-2

Verify hose routing, end diameter, and centerline length before installation. Because some applications vary by equipment package or heater layout, compare the original hose shape to the Gates 18774 molded profile before replacing the part.

Quality Assurance

Gates manufactures this molded heater hose as an OEM-style replacement built for formed routing and consistent fit. The EPDM construction and factory-molded shape support dependable service in heating and cooling system applications.