Gates 12509 Engine Coolant Bypass Hose

Overview

Gates 12509 is a molded engine coolant bypass hose built in an OEM-style shape for tight engine compartments. It uses EPDM construction and a small inside diameter to handle coolant, water, and air routing in the cooling system.

Compatible With Chevrolet Equinox, Chevrolet Malibu, Chevrolet Spark, Chevrolet Trax, and GMC Terrain applications listed below, this molded heater hose follows the factory routing needed for specific coolant connections. The Gates Molded Heater Hose line focuses on formed hose geometry for applications where a straight hose will not match the original path.

Key Features

• Factory-molded hose profile for precise routing in compact engine bays
• EPDM construction for coolant, water, and air service
• Small I.D. design with 19 mm ends for matching the original connection size
• 3.75 in. centerline length for application-specific fitment
• Gates 12509 part number for catalog and service reference

Detailed Description

Gates 12509 is an engine coolant bypass hose designed as a molded replacement for vehicles that use a formed hose path between cooling system components. The EPDM material is suited for coolant-system service, and the molded shape helps the hose follow the original routing without forcing bends that can stress the connection points. This part cross-references Carlson 12509 for the same application.

Fitment includes 2020 Chevrolet Equinox, N/A; 2020-2021 Chevrolet Malibu, N/A; 2021 Chevrolet Equinox, thermostat to cylinder head; 2021 Chevrolet Trax, N/A; 2022 Chevrolet Malibu, water outlet to pipe; 2022 Chevrolet Spark, N/A; 2022 Chevrolet Trax, pipe to outlet flange; 2020-2022 GMC Terrain, outlet tee to connecting pipe. Use the Gates 12509 part number to confirm the correct molded hose for the cooling circuit before installation.

Common Uses

• Replacing a cracked or heat-aged coolant bypass hose
• Restoring proper coolant routing in a molded hose application
• Addressing leaks at hose ends or formed bends
• Correcting hose fitment where a straight hose will not align
• Servicing coolant, water, or air transfer lines in the cooling system

Installation Notes

Verify end diameters, centerline length, and molded shape against the removed hose before installation. Confirm the vehicle-specific routing shown in the fitment list, since the Gates 12509 is used in multiple cooling-system locations across different applications. Inspect adjoining pipes, tees, and flanges for wear or corrosion before installing the new hose.

Quality Assurance

Gates supplies molded coolant hoses in OEM-style configurations for service replacement use. The Molded Heater Hose line is built for application-specific routing in compact engine compartments, and the EPDM construction supports coolant-system service requirements.