Subaru OEM Coolant Hose (05-09 Legacy - 30D) | 99078AA280

Overview

The Genuine Subaru OEM Coolant Hose (Part #99078AA280) is an exact-fit factory replacement cooling system hose designed specifically for 2005–2009 Subaru Legacy vehicles. Engineered to Subaru's original factory specifications, this OEM coolant hose ensures a perfect seal, optimal coolant flow, and long-lasting durability — keeping your engine running at the correct operating temperature. Choosing a genuine OEM part eliminates the guesswork of fitment and guarantees the same quality as the hose installed at the factory.

Key Features & Benefits

• Genuine Subaru OEM Quality — Manufactured to exact factory specifications for guaranteed fit, form, and function with no modifications required.
• Exact-Fit Replacement — Engineered specifically for the 2005–2009 Subaru Legacy, ensuring proper seating on all connection points without trimming or adapters.
• Premium Materials — Constructed from high-grade rubber compounded to withstand coolant chemistry, heat cycling, and engine bay temperatures over the long term.
• Leak-Free Sealing — OEM dimensions and wall thickness deliver a secure, pressure-tested connection that aftermarket hoses may not replicate.
• Factory Warranty Eligible — As a genuine Subaru part, it is backed by Subaru's standard OEM parts warranty for added peace of mind.
• Direct Replacement — Restores original cooling system performance and prevents overheating, coolant loss, and potential engine damage caused by a cracked or deteriorated hose.

What's Included

• 1x Genuine Subaru OEM Coolant Hose — Part #99078AA280

Specifications

Fitment & Compatibility

This Genuine Subaru OEM Coolant Hose is designed for the following vehicles:

Always verify your vehicle's specific build and trim code before ordering. Cross-reference Subaru part number 99078AA280 to confirm compatibility with your exact Legacy configuration.

Installation

This coolant hose is a direct bolt-on/hose-on replacement requiring no cutting or modification. The installation process involves draining the cooling system, removing the old deteriorated hose and its clamps, installing the new OEM hose, and refilling with the correct Subaru-approved coolant. While a confident DIYer can complete this repair, professional installation by a qualified Subaru technician is recommended to ensure the cooling system is properly pressurized and free of air pockets after service.