Gates 19203 HVAC Heater Hose - Heater Inlet or Heater Outlet

Gates 19203 Molded Heater Hose Overview

The Gates 19203 molded heater hose is an OEM-style coolant hose built for tight engine bays and factory-style routing. It is formed to match the original path on select Nissan Frontier and Xterra applications, helping maintain proper coolant flow through the heater circuit.

Made from EPDM and factory-molded for a precise fit, this Gates Molded Heater Hose line is engineered for coolant, water, and air service, and it is also approved for marine applications. The 19203 part number is a direct replacement option for vehicles that need a small I.D. molded hose with the correct bends and end sizes.

Key Features

• Gates Molded Heater Hose, part number 19203
• Factory-molded, OE-style shape for tighter engine compartments
• EPDM construction for heater and coolant service
• End I.D. sizes: 16 mm (.63 in) and 19 mm (.73 in)
• Centerline length: 450 mm (17.7 in)
• Fits select Nissan Frontier and Nissan Xterra heater outlet and heater inlet locations
• Approved for coolant, water, air, and marine applications

Detailed Description

Gates 19203 is a molded heater hose designed around the packaging demands of modern engine compartments. Its factory-formed shape helps it follow the original hose routing on select Nissan Frontier and Nissan Xterra models, reducing the need to force a straight hose into a curved path. The EPDM material is suited for heater hose service where coolant circulation and temperature resistance matter.

This part cross-references Dayco 87788 for the same application. It is a practical replacement for 1999-2004 Nissan Frontier heater outlet, 2000-2004 Nissan Xterra heater outlet, and 2002 Nissan Frontier heater inlet applications. If you are searching for a molded heater hose for Nissan Frontier or a heater hose for Nissan Xterra, the 19203 provides the correct molded profile and small inside diameters for those factory connections.

What It Helps Fix

• Coolant leaks at a worn or cracked heater hose
• Improper hose routing in a tight engine compartment
• Heat-related hose deterioration
• Restricted heater coolant flow from a damaged hose
• Fitment issues when a straight hose does not match the original bend

Installation Notes and Tips

Verify the heater outlet or heater inlet location before installation and compare the hose shape, end diameters, and centerline length to the original part. On Nissan Frontier and Xterra applications, confirm that the molded routing matches the factory path so the hose does not twist or kink after installation. Inspect adjoining clamps, pipes, and coolant connections for wear before reassembly.

Quality Assurance

Gates is known for OE-style hose construction and application-specific molded designs. The 19203 molded heater hose is built to match the demands of factory coolant routing in select Nissan applications and is suitable for coolant, water, air, and marine service.