Gates 18856 HVAC Heater Hose - Tee To Intake Manifold or Valve To Engine

Gates 18856 Molded Heater Hose Overview

The Gates 18856 molded heater hose is an OEM-style coolant hose built for tight engine bays and factory routing. It is formed to match the original path in applications such as the Chevrolet Trailblazer, GMC Envoy, and Honda Civic, helping restore proper coolant flow through the heater circuit.

Made from EPDM and factory-molded for a precise shape, this Gates Molded Heater Hose line is suited for coolant, water, and air service, and it is also approved for marine applications. The 18856 part number is a direct-fit style replacement for vehicles that require a small I.D. molded hose with a 17.9 in. centerline length.

Key Features

• Gates part number 18856
• EPDM construction for coolant-system service
• Factory-molded, OEM-style hose shape
• 0.62 in. inside diameter at both ends
• 17.9 in. centerline length
• Suitable for coolant, water, and air applications
• Approved for marine applications
• Fits tight engine compartments with routed hose paths

Product Line Details

Gates Molded Heater Hose products are built for vehicles that use formed coolant hoses instead of straight universal tubing. This line focuses on maintaining the original hose routing and fit, which is important in compact engine compartments where clearance and bend shape matter. For applications like the Buick Rainier, Chevrolet Trailblazer, GMC Envoy, and Honda Civic, the molded profile helps match the factory layout.

Detailed Description

Gates 18856 is a molded HVAC heater hose designed for specific OE-style routing. Its EPDM material is selected for coolant-system use, while the molded construction supports a clean installation path in vehicles with limited space around the intake manifold or engine-side heater circuit. This part cross-references Dayco 87691 for the same application.

Compatible fitment includes 2004-2005 Buick Rainier, Tee To Intake Manifold; 2002-2005 Chevrolet Trailblazer, Tee To Intake Manifold; 2002-2005 Chevrolet Trailblazer EXT, Tee To Intake Manifold; 2002-2005 GMC Envoy, Tee To Intake Manifold; 2002-2005 GMC Envoy XL, Tee To Intake Manifold; 2004-2005 GMC Envoy XUV, Tee To Intake Manifold; 2003-2005 Isuzu Ascender, Tee To Intake Manifold; 2002-2004 Oldsmobile Bravada, Tee To Intake Manifold; 1988-1991 Honda Civic, Valve To Engine; and 1988-1991 Honda CRX, Valve To Engine.

What It Helps Address

• Cracked or leaking molded heater hose sections
• Restricted coolant flow through the heater circuit
• Incorrect hose routing in compact engine bays
• Heat-related hose deterioration in EPDM service areas
• Replacement needs for OE-shaped heater hose assemblies

Installation Notes and Tips

Verify end inside diameter, centerline length, and routing before installation. Match the hose path to the original layout on the vehicle, especially on Tee To Intake Manifold and Valve To Engine applications. Inspect adjoining clamps, tees, and connection points for wear or corrosion before installing the new hose.

Quality Assurance

Gates manufactures this molded heater hose as an OE-style replacement for vehicles that require formed coolant routing. The design and material selection reflect the needs of modern compact engine compartments and factory-style HVAC hose service.