Gates 12359 HVAC Heater Hose - Tee-1 To Heater

Gates Molded Heater Hose 12359

Gates 12359 is a molded heater hose built for tight engine bays where a factory-shaped coolant hose is needed. This EPDM hose is sized with 16 mm (0.62 in) inside diameters at both ends and an 8.9 in centerline length for a precise routing path.

Compatible with 2014-2016 Toyota Sienna, Tee-1 To Heater, this molded heater hose supports coolant, water, and air service. It is also approved for marine applications, making it a practical OE-style replacement for the Toyota Sienna heater hose route.

Key Features

• Brand: Gates Molded Heater Hose
• Part number: 12359
• Factory-molded, OEM-style shape for compact engine compartments
• EPDM construction for heater and coolant service
• 16 mm (0.62 in) inside diameter at both ends
• 8.9 in (226 mm) centerline length
• Approved for coolant, water, air, and marine applications
• Cross-reference: OSC 13359

Product Details

Gates Molded Heater Hose 12359 is formed to follow the original hose path in smaller, tighter-fitting engine compartments. The molded design helps maintain routing and clearance where a straight hose would not match the OE layout. For 2014-2016 Toyota Sienna models at the Tee-1 to Heater position, this hose provides the correct shape and dimensions for a direct replacement.

The Gates molded heater hose line focuses on OE-style fitment and consistent routing in HVAC and cooling-system applications. If you are replacing a worn or damaged Toyota Sienna heater hose, part number 12359 offers the molded profile and EPDM material needed for this application.

Common Problems This Part Can Address

• Cracked or split heater hose sections
• Coolant seepage at a molded hose bend
• Collapsed hose routing in a tight engine compartment
• Incorrect hose shape after a previous repair
• Loss of heater circuit flow from a damaged hose

Installation Notes and Tips

Verify the hose routing, end diameters, and centerline length before installation. Match the molded shape to the original path on the vehicle and inspect adjoining clamps, tees, and fittings for wear before reassembly. Confirm fitment for 2014-2016 Toyota Sienna, Tee-1 To Heater, before removing the old hose.

Quality Assurance

Gates is a recognized supplier of molded coolant and heater hose products for automotive service applications. Part number 12359 is built to OE-style dimensions for the listed Toyota Sienna fitment and is approved for coolant, water, air, and marine use.