Gates 12355 HVAC Heater Hose - Tee-2 To Heater

Gates Molded Heater Hose for Toyota Sienna

The Gates 12355 molded heater hose is an OEM-style coolant hose built for tight engine compartments where a formed routing path matters. It is made from EPDM and measures 16 mm (0.62 in) at both ends with a 10.47 in (266 mm) centerline length.

Compatible with 2014-2016 Toyota Sienna applications at the Tee-2 to Heater position, this molded hose supports coolant, water, and air transfer. The Gates Molded Heater Hose line focuses on factory-shaped routing for vehicles that need a precise fit in compact spaces.

• Brand: Gates
• Part number: 12355
• EPDM construction for coolant-system service
• Factory-molded, OEM-style shape
• 16 mm (0.62 in) inside diameter at both ends
• 10.47 in (266 mm) centerline length
• Approved for marine applications
• Cross-reference: Bosch 13355

Detailed Product Overview

Gates 12355 is a molded heater hose for the 2014-2016 Toyota Sienna, Tee-2 to Heater position. Its formed profile helps match the original hose routing in smaller, tighter engine compartments, reducing the need to force a straight hose into a curved path. The EPDM material is suited for coolant, water, and air service, and the hose is also approved for marine use. If you are replacing a worn or leaking heater hose on a Toyota Sienna, this part number 12355 provides a direct OE-style replacement format.

Common Problems This Hose Can Address

• Coolant seepage from a cracked or aged heater hose
• Improper routing caused by a collapsed or misshaped hose
• Restricted heater flow from internal hose deterioration
• Fitment issues when a straight hose cannot follow the factory path
• Service replacement for a damaged Tee-2 to Heater hose on Toyota Sienna models

Installation Notes and Tips

Verify the hose routing, end diameters, and centerline length before installation. Confirm the application on 2014, 2015, and 2016 Toyota Sienna models at the Tee-2 to Heater position, and compare the original hose shape to the molded profile of Gates 12355. Inspect adjoining clamps, tees, and coolant connections for wear before reassembly.

Quality Assurance

Gates is known for OE-style hose construction and molded replacement parts that follow factory routing requirements. This molded heater hose is built to match the tighter packaging demands found in modern engine bays and to support dependable coolant-system service.