Gates 18877 HVAC Heater Hose - Heater To Engine, Heater To Pipe or Valve To Heater

Gates Molded Heater Hose 18877 Overview

Gates 18877 is a molded HVAC heater hose built for tight engine bays where a straight hose will not route cleanly. This factory-molded, OEM-style hose uses EPDM construction and is approved for coolant, water, air, and marine applications.

Compatible With 1988-1992 Mazda 626 and Mazda MX-6 heater-to-engine routing, as well as Ford Probe and Hummer H1 heater hose applications, Gates 18877 supports direct-fit service where the original hose follows a formed path. The Gates Molded Heater Hose line focuses on shaped replacement hoses for compact engine compartments.

Key Features

• EPDM hose material for coolant, water, and air service
• Factory-molded shape for OEM-style routing
• Small inside diameter: 0.62 in. (16 mm) at both ends
• Centerline length: 21.8 in. (554 mm)
• Approved for marine applications
• Gates part number 18877

Detailed Description

Gates 18877 Molded Heater Hose is formed to match the routing needs of smaller, tighter-fitting engine compartments. Its molded profile helps maintain the correct hose path between heater and engine connections, reducing the need to force a straight hose into a curved application. The EPDM construction is suited for coolant transfer and other listed fluid or air service, while the 16 mm end diameters and 554 mm centerline length provide the dimensions needed for the specified applications. This part number 18877 is a practical OE-style replacement for vehicles that use a shaped heater hose layout.

This part cross-references Dayco 86051 and Four Seasons 63253 for the same application.

What It Helps Address

• Cracked or aged heater hose routing in compact engine bays
• Coolant leaks at a formed hose section
• Poor hose fitment where a straight hose will not follow the original path
• Replacement needs for heater-to-engine and valve-to-heater routing
• Service on vehicles requiring a molded 16 mm heater hose

Installation Notes and Tips

Verify the hose path, end diameters, and centerline length before installation. Match the molded shape to the original routing on the vehicle and inspect adjoining clamps, pipes, and heater connections for wear or corrosion. Confirm fitment for 2002-2004 Hummer H1 valve-to-heater routing, 1992 Ford Probe heater-to-engine routing, 1988-1992 Mazda 626 heater-to-engine routing, 1988-1992 Mazda MX-6 heater-to-engine routing, and 1989-1991 Ford Probe heater-to-pipe routing.

Quality Assurance

Gates manufactures this molded heater hose as an OEM-style replacement in the Gates Molded Heater Hose line, with construction intended for formed routing in demanding engine compartment layouts.