Gates 18451 HVAC Heater Hose - Heater To Thermostat

Gates 18451 Molded Heater Hose Overview

The Gates 18451 molded heater hose is an OEM-style coolant hose built for tight engine bays where a straight hose will not route correctly. It is formed for the heater-to-thermostat path and uses EPDM construction for coolant, water, and air service, with marine application approval.

Compatible with select Saturn L300, LW300, LS2, and LW2 applications, this molded heater hose supports a precise factory-style fit in compact HVAC and cooling layouts. The Gates Molded Heater Hose line focuses on shaped replacement hoses that match original routing requirements.

Key Features

• Factory-molded, OE-style replacement hose
• EPDM material for cooling-system service
• Small I.D. design for tighter engine compartments
• End 1 inside diameter: 0.56 in. (14 mm)
• End 2 inside diameter: 0.76 in. (19 mm)
• Centerline length: 27 in. (686 mm)
• Formed for heater-to-thermostat routing
• Approved for coolant, water, air, and marine applications

Product Details

Gates 18451 is a molded heater hose engineered to follow the original hose path in vehicles with limited clearance around the engine. The shaped design helps maintain proper routing between the heater circuit and thermostat housing, which is important for consistent coolant flow and a clean installation. This part cross-references CSF 10451 for the same application.

For buyers searching for a 2001-2005 Saturn L300 heater to thermostat hose or a 2001-2003 Saturn LW300 molded heater hose, Gates 18451 provides the correct molded profile and connection sizes. It also matches 2000 Saturn LS2 and 2000 Saturn LW2 heater-to-thermostat applications.

Common Problems It Can Address

• Cracked or leaking heater hose at the thermostat connection
• Incorrect hose routing in a tight engine compartment
• Restricted coolant transfer through a deteriorated hose
• Fitment issues caused by using a straight universal hose
• Replacement needs for aged EPDM coolant hose material

Installation Notes

Verify the hose path, end diameters, and centerline length before installation. Match the molded shape to the original routing on the vehicle and inspect adjoining clamps, thermostat necks, and heater connections for wear or corrosion. Confirm fitment by vehicle year, make, model, and heater-to-thermostat position before final assembly.

Quality Assurance

Gates is known for OE-style hose engineering, and the Molded Heater Hose line is built to replicate factory routing requirements for service replacement. Part number 18451 is intended for direct-fit applications listed above and is backed by Gates product engineering standards.