CSF 3803 Radiator

OE-Style Radiator for Subaru Legacy and Outback

CSF 3803 is an OE-style radiator built with an aluminum core and plastic tanks for the 2015-2019 Subaru Legacy and 2015-2019 Subaru Outback. It is designed around the factory layout to support proper cooling performance and direct replacement fitment.

Key Features

• Aluminum core with plastic tanks for OE-style construction
• Down-flow radiator design
• Single-row core configuration
• Core dimensions: 27 in. wide, 13 3/4 in. long, 1 1/4 in. thick
• Oil cooler integrated: 14 3/4 in. high-efficiency plate type
• Inlet and outlet layout matches factory-style routing
• No radiator cap included
• CSF part number 3803

Detailed Description

CSF 3803 is engineered as a direct-fit radiator for Subaru Legacy and Subaru Outback applications from 2015 through 2019. The radiator uses an aluminum core with plastic tanks, following an OE-style design that supports factory-like fitment and cooling system routing. With a down-flow configuration and single-row core, it is built to match the original layout while maintaining the dimensions needed for proper installation in the engine bay. This part number 3803 also includes a high-efficiency plate-type oil cooler, making it a practical replacement for vehicles that rely on integrated cooling system components.

CSF manufactures radiators to high-performance standards and validates designs through laboratory wind-tunnel testing. The brand’s long production history and broad catalog support a wide range of vehicle applications, including Subaru Legacy and Outback cooling system replacements.

This part cross-references BBB Industries 13460 for the same application.

What This Radiator Helps Address

• Overheating caused by a leaking or restricted radiator
• Cooling loss from cracked plastic tanks or aged core materials
• Reduced heat transfer from a worn factory radiator
• Oil cooling concerns related to an integrated cooler assembly
• Replacement needs after corrosion, impact damage, or internal blockage

Installation Notes and Tips

Verify inlet and outlet orientation before installation, especially on Subaru Legacy and Subaru Outback models. Confirm the radiator dimensions and hose routing against the original unit, and transfer any required sensors or fittings from the OE assembly if applicable. Because a cap is not included, reuse the correct factory cap or replace it with the specified CSF cap number 4514 if needed.

Quality Assurance

CSF radiators are manufactured in ISO/TSO-certified facilities and designed to meet high-performance cooling standards. The brand states that its radiator designs are validated through laboratory wind-tunnel testing for cooling performance.