Gates 12457 HVAC Heater Hose - Thermostat To Pipe-1

Gates Molded Heater Hose 12457

Gates 12457 is a molded heater hose built for tight engine bays where a straight hose will not route cleanly. It uses factory-molded OE-style shaping and EPDM construction for coolant, water, and air service, with marine application approval noted by the manufacturer.

Key Features

• Factory-molded hose profile for compact engine compartment routing
• EPDM construction for heater and coolant service
• Small I.D. design with 16 mm / 0.62 in. end inside diameter at both ends
• Centerline length: 147 mm / 5.77 in.
• Suitable for coolant, water, and air applications
• Gates 12457 molded heater hose for OE-style replacement needs

Product Details

This Gates Molded Heater Hose line is made for applications that require a pre-formed hose shape rather than a universal bend. Part number 12457 follows the molded routing used in modern engine layouts and is listed for thermostat-to-pipe service on select Toyota and Lexus hybrid cooling systems. It is a direct-fit style hose for 2013-2018 Toyota Avalon, thermostat to pipe-1; 2013-2017 Toyota Camry, thermostat to pipe-1; and 2013-2014 Lexus ES300h, thermostat to pipe-1. This part cross-references OSC 13457 for the same application.

Common Uses

• Replacing a cracked or heat-aged heater hose
• Restoring coolant flow between the thermostat and pipe connection
• Addressing leaks at a molded hose section in a tight engine bay
• Correcting hose routing where a straight hose will not maintain the factory path
• Servicing Toyota Avalon, Toyota Camry, and Lexus ES300h cooling circuits

Installation Notes

Verify end diameters and centerline length before installation to confirm routing and fitment. Inspect adjoining pipes, clamps, and sealing surfaces for wear or corrosion before transferring the hose into service. Because this hose is molded for specific routing, align it to the original path during installation to avoid twist or stress at the connections.

Quality Assurance

Gates is known for OE-style hose engineering across cooling and HVAC applications. Part number 12457 is built from EPDM and follows a factory-molded profile intended to match the routing demands of smaller, tighter-fitting engine compartments.