Gates 18791 HVAC Heater Hose

Gates 18791 Molded Heater Hose Overview

The Gates 18791 molded heater hose is a factory-molded, OE-style coolant hose built for tight engine bays and precise routing. Made from EPDM, it serves coolant, water, and air applications and is also approved for marine use.

For Subaru Legacy and Outback service, as well as Chevrolet Cruze, Sonic, Trax, and Buick Encore cooling-system repairs, this molded hose helps restore the original hose path and fitment. Gates Molded Heater Hose 18791 is shaped for applications where a straight hose will not follow the factory route.

Key Features

• EPDM construction for coolant, water, and air service
• Factory-molded shape for OEM-style routing in compact engine compartments
• Small inside diameter of 16 mm (0.62 in) at both ends
• Centerline length of 188 mm (7.4 in)
• Approved for marine applications
• Direct replacement style for molded heater hose and coolant hose service

Detailed Product Description

Gates 18791 is a molded coolant hose from the Gates Molded Heater Hose line, engineered for vehicles that require a formed hose to maintain proper routing and clearance. The EPDM rubber construction supports heat and coolant exposure, while the molded profile helps match the original hose path in tighter engine compartments. This part is used in HVAC and cooling-system routing where a straight hose would not duplicate the factory bend.

It fits applications such as 2015-2021 Buick Encore oil cooler inlet, 2014-2021 Chevrolet Trax oil cooler inlet, 2011-2015 Chevrolet Cruze oil cooler inlet, and 2010-2018 Subaru Legacy pipe to cylinder head (left). It also applies to Subaru Outback, Tribeca, B9 Tribeca, Impreza, Mazda RX-7, Nissan 280ZX, and other listed vehicles. This part cross-references Dorman - OE Solutions 667-521 for the same application.

Common Problems This Hose Can Help Solve

• Cracked or leaking molded heater hose
• Collapsed hose routing in a tight engine compartment
• Coolant seepage at a worn oil cooler inlet or thermostat connection
• Improper hose fit after a previous repair with a non-molded hose
• Loss of factory-style routing on Subaru, Chevrolet, Buick, Mazda, or Nissan cooling-system service

Installation Notes and Tips

Verify end inside diameter, centerline length, and molded shape against the removed hose before installation. Confirm the hose route and connection points for your specific vehicle, especially on Subaru Legacy and Outback thermostat routing and Chevrolet Cruze or Trax oil cooler inlet applications. Inspect adjoining pipes, clamps, and fittings for wear or corrosion before installing the new hose.

Quality Assurance

Gates manufactures this molded heater hose as an OE-style replacement part for cooling-system service. The molded EPDM construction and application-specific shape support accurate fitment on the listed vehicles, including Chevrolet Cruze, Chevrolet Sonic, Subaru Outback, and Buick Encore.