Subaru OEM Coolant Bypass Hose Subaru Crosstrek / Forester / Impreza / Legacy / Outback | 21204AB340

Overview

The Genuine Subaru OEM Coolant Crossover Hose (Part #21204AB340) is a factory-replacement coolant hose. It fits the following vehicles:
2013-2017 Subaru Crosstrek
2011-2018 Subaru Forester
2012-2016 Subaru Impreza
2013-2019 Subaru Legacy
2013-2019 Subaru Outback
As an authentic OEM component, it delivers the exact fit, material quality, and performance specifications required by Subaru engineers — ensuring your cooling system operates at peak efficiency and protecting your engine from overheating.

Key Features & Benefits

• Genuine Subaru OEM Part – Manufactured to factory specifications for a guaranteed exact fit and reliable sealing, eliminating the guesswork of aftermarket alternatives.
• Precision-Molded Construction – Engineered from OEM-grade rubber and reinforced materials that resist heat, pressure, and coolant degradation over time.
• Exact-Match Replacement – Direct bolt-on fitment with no modifications required; restores your cooling system to original factory condition.
• Factory Warranty Coverage – Backed by Subaru's genuine parts warranty for peace of mind after installation.
• Optimal Coolant Flow – Maintains correct coolant crossover routing to prevent hot spots, overheating, and premature engine damage.
• Corrosion-Resistant Fittings – OEM-spec hose ends ensure leak-free connections at mating ports, maintaining proper system pressure.

What's Included

• 1x Genuine Subaru Coolant Crossover Hose (Part #21204AB340)

Specifications

Fitment & Compatibility

This coolant crossover hose is engineered specifically for the following Subaru vehicles:

• 2013-2017 Subaru Crosstrek
• 2011-2018 Subaru Forester
• 2012-2016 Subaru Impreza
• 2013-2019 Subaru Legacy
• 2013-2019 Subaru Outback

Always verify your vehicle's year, model, and trim before ordering. If you are unsure of compatibility, reference Subaru part number 21204AB340 against your vehicle's VIN or consult your Subaru dealer.

Installation

This is a direct OEM replacement hose requiring no modifications for a proper fit. Installation involves draining the cooling system, removing the old or damaged crossover hose, and securing the new hose at both connection points with the appropriate clamps. We recommend having this service performed by a qualified Subaru technician or experienced mechanic to ensure the cooling system is properly bled and pressure-tested after installation.