Gates 18400 HVAC Heater Hose - Intake Manifold To Pipe-3

Gates 18400 Molded Heater Hose Overview

The Gates 18400 molded heater hose is an OEM-style coolant hose built for tight engine bays where a straight hose will not route correctly. It is made from EPDM and uses a factory-molded shape to support coolant, water, and air transfer in HVAC and engine cooling systems.

Compatible With select Toyota 4Runner and Toyota Pickup applications, as well as other listed import vehicles, this molded heater hose follows the original routing needed for reliable heater and coolant flow. The Gates Molded Heater Hose line focuses on formed replacement hoses for compact engine compartments, including the Gates 18400.

• EPDM construction for coolant, water, and air service
• Factory-molded shape for tight underhood routing
• 0.5 in. inside diameter at both ends
• 8.3 in. centerline length
• OEM-style replacement for HVAC heater hose applications
• Approved for marine applications

Detailed Application and Fitment

Gates 18400 is a molded heater hose for vehicles that need a formed hose path rather than a universal straight section. It is listed for 1986-1995 Toyota 4Runner, 1986-1995 Toyota Pickup, 1984 Toyota Pickup, 1990-1994 Mitsubishi Mighty Max, 1990-1994 Mitsubishi Montero, 1990-1991 Dodge Ram 50, 1983-1987 Honda Prelude, and 1984 Toyota Celica. This part cross-references Continental 63171 and Dayco 71621 for the same application.

Common Problems This Hose Can Address

• Cracked or leaking heater hose routing in a confined engine compartment
• Incorrect hose shape that prevents proper installation on OEM-style routing
• Restricted coolant flow through a deteriorated molded hose
• Heat-related hose hardening or swelling in HVAC coolant circuits
• Replacement needs for coolant, water, or air transfer lines

Installation Notes and Tips

Verify the end inside diameter and centerline length before installation to confirm routing match. Compare the molded shape to the original hose on the vehicle, especially on 1986-1995 Toyota 4Runner, Toyota Pickup, and other listed applications where clearance is limited. Inspect clamps, pipe ends, and adjoining coolant passages for wear before installing the Gates 18400.

Quality Assurance

Gates manufactures this molded heater hose as an OEM-style replacement using EPDM material and factory-formed dimensions for consistent fitment in HVAC and coolant applications. The molded design supports the routing demands of smaller, tighter engine compartments and is approved for marine use.