Subaru OEM Coolant Heater Hose (02-04 WRX) | 21204AA351

Overview

The Genuine Subaru OEM Coolant Heater Hose (Part #21204AA351) is an exact-fit factory replacement heater hose designed specifically for the 2002–2004 Subaru WRX. As a direct OEM component sourced from Subaru, this hose ensures the same quality, dimensions, and material specification as the original part that left the factory — delivering reliable coolant flow to your heater core and maintaining optimal cabin heating performance.

Key Features & Benefits

• Genuine OEM Quality – Manufactured to Subaru's exact factory specifications, eliminating the fitment and durability concerns common with aftermarket alternatives.
• Exact-Fit Guarantee – Engineered specifically for the 2002–2004 Subaru WRX EJ20/EJ205 engine bay; no trimming, adapters, or modifications required.
• Factory-Grade Materials – Constructed from OEM-spec rubber/EPDM compound rated to withstand the high temperatures and pressures of the WRX cooling system.
• Prevents Coolant Leaks – Restores the integrity of your heater circuit, protecting against coolant loss, overheating, and heater core damage.
• OEM Part Number Cross-Reference – Subaru part number 21204AA351 makes verification and cross-referencing straightforward.
• Factory Warranty Eligible – As a Genuine Subaru part sold through an authorized Subaru dealer, this hose is backed by Subaru's standard OEM parts warranty.

What's Included

• 1x Genuine Subaru Coolant Heater Hose (Part #21204AA351)

Specifications

Fitment & Compatibility

This Genuine Subaru heater hose is a direct OEM replacement for the following vehicles:

Always verify your Subaru part number against your VIN before ordering to confirm exact fitment for your vehicle's production date and market.

Installation

This coolant heater hose is a direct bolt-on (clamp-on) OEM replacement. Installation involves draining the cooling system to a safe level, removing the old hose and clamps, and fitting the new hose with the original or new clamps. Basic mechanical experience is recommended. Always allow the engine to cool completely before working on the cooling system, and refill with the correct Subaru Super Coolant after installation. Professional installation is available at any Subaru dealership service center.