Gates 18797 HVAC Heater Hose

Gates 18797 Molded Heater Hose Overview

The Gates 18797 molded heater hose is an OEM-style coolant hose built for tight engine compartments where a factory-shaped routing path matters. Made from EPDM, it supports coolant, water, and air applications and is also approved for marine use.

Compatible With select Lexus LS600h, Buick Rainier, Chevrolet Trailblazer, GMC Envoy, Isuzu Rodeo, Honda Passport, Toyota 4Runner, and related applications, this molded heater hose is shaped for direct routing in the listed positions.

Key Features

• Factory-molded design for OE-style hose routing
• EPDM construction for heater and coolant service
• Small inside diameter: 0.62 in. / 16 mm at both ends
• Centerline length: 7.7 in. / 196 mm
• Fits applications with molded hose routing in compact engine bays
• Approved for coolant, water, air, and marine applications
• Gates 18797 is listed for multiple HVAC heater hose positions

Product Details

Gates Molded Heater Hose line products are built to match the shape and routing needs of modern vehicles with tighter packaging around the engine and HVAC system. Part number 18797 uses a molded EPDM construction with equal 16 mm ends and a 7.7-inch centerline length, making it a practical OE-style replacement where the original hose follows a formed path. This part number 18797 is listed across several vehicle platforms, including Lexus LS600h inverter cooling hose applications and heater-to-pipe or valve-to-tee routing on select Buick, Chevrolet, GMC, Isuzu, Honda, and Toyota models.

This part cross-references CSF 10797 for the same application.

Common Problems This Hose Can Address

• Cracked or hardened heater hose material
• Coolant seepage at a molded hose section
• Restricted flow caused by a collapsed or deformed hose
• Incorrect routing in a tight engine compartment
• Replacement needs for heater, coolant, water, or air hose service

Installation Notes and Fitment

Verify the hose position, end diameter, and centerline length before installation. Fitment includes 2008-2014 Lexus LS600h, inverter cooling hose-6; 2004-2005 Buick Rainier, pipe-1 to engine; 2002-2005 Chevrolet Trailblazer and Trailblazer EXT, pipe-1 to engine; 2002-2005 GMC Envoy and Envoy XL, pipe-1 to engine; 2004-2005 GMC Envoy XUV, pipe-1 to engine; 2003-2005 Isuzu Ascender, pipe-1 to engine; 2002-2004 Oldsmobile Bravada, pipe-1 to engine; 1995-1997 and 1991-1993 Isuzu Rodeo, heater to pipe; 1994-1996 Honda Passport, heater to pipe; 1995 and 1988-1993 Isuzu Pickup, heater to pipe; 1993-1995 Toyota 4Runner, valve to tee-2; 1994 Isuzu Amigo, heater to pipe; 1994 Isuzu Pickup, heater to pipe; 1994 Isuzu Rodeo, heater to pipe; 1993-1994 Toyota Pickup, valve to tee-2; 1989-1993 Isuzu Amigo, heater to pipe; 1991-1992 Toyota 4Runner, valve-2 to tee-2 and valve to engine; and 1991-1992 Toyota Pickup, valve-2 to tee-2 and valve to engine.

For Toyota 4Runner, Toyota Pickup, and Honda Passport heater hose replacement, confirm whether the vehicle uses the auxiliary-heater routing noted in the fitment data. For Buick Rainier, Chevrolet Trailblazer, GMC Envoy, and Isuzu Ascender applications, confirm the pipe-1 to engine routing before installation.

Quality Assurance

Gates is a recognized aftermarket brand for molded hose applications, and the 18797 follows an OEM-style formed profile for listed vehicle fitments. Use the published dimensions and fitment notes to confirm application match before service.