Radiator for Subaru Outback Legacy (2015-2019) 2.5L

Direct-Fit Replacement Radiator for 2015-2019 Subaru Outback, Legacy (BS/BN)

What it Does: The replacement radiator restores peak thermal heat rejection on the 2015-2019 Subaru Outback and Legacy 2.5L to prevent engine overheating and protect against head gasket failure.

The Stock Subaru Outback, Legacy Radiator Thermal Breakdown

Factory cooling systems on the BS/BN chassis rely on composite nylon end tanks crimped to an aluminum core via an elastomeric gasket. Over repeated thermal cycles and high-pressure CVT load, the plastic degrades, becoming brittle and forming hairline fractures along the tank seams. Additionally, internal tube scale and external corrosion of the ultra-thin stock fins diminish thermal conductivity. On boxer engines like the FB25, a compromised cooling system rapidly leads to localized hot spots, warped cylinder heads, and breached head gaskets.

The Engineering Solution

Engineered as a drop-in replacement for OEM part 45111AL04A, this radiator features an efficient 1-row aluminum core measuring 28-1/4 inches by 11-5/8 inches with a 5/8-inch depth. High-density louvered aluminum fins optimize boundary-layer airflow and maximize convective heat transfer from the 1.56-inch inlet and outlet coolant channels. The high-grade reinforced composite end tanks are precision crimped with high-temperature O-ring seals, and every unit undergoes factory pressure testing to ensure leak-free hydraulic integrity under peak operating pressures.

What's Included

• 1 Radiator

Technical Specifications

Compatibility

• 2015-2019 Subaru Outback 2.5L (CVT Automatic)
• 2015-2019 Subaru Legacy 2.5L (CVT Automatic)

Frequently Asked Questions & Fitment Warnings

Does this fit the BS/BN Outback, Legacy?

Yes, this is a direct fit for the 2015-2019 Subaru Outback and Legacy equipped with the FB25 2.5L engine. This radiator fits 2.5L 4-cylinder CVT models only; it does not fit models equipped with the 3.6L EZ36D engine.

Do I need to bleed the air from the cooling system after installation?

Yes, boxer cooling systems are prone to air pockets, requiring a complete vacuum fill or standard burping procedure until the thermostat opens to eliminate trapped air and prevent localized overheating.

The Subaru Reliability Caliber

Built to withstand daily commuting and harsh weather, this radiator preserves the legendary all-wheel-drive reliability of your Subaru by keeping powertrain operating temperatures strictly within factory tolerances.