CSF 3784 Radiator

OE-Style Radiator for Toyota and Lexus Applications

CSF Radiator 3784 is an OE-style replacement radiator built with an aluminum core and plastic tanks for a direct-fit cooling solution. It is engineered for cross flow cooling performance and matches the factory-style layout used on select Toyota Prius, Prius Prime, Corolla, and Lexus UX250h applications.

With a 5/8-inch core thickness, 26 9/16-inch core length, and 14 5/16-inch core width, this radiator is designed to support consistent heat transfer in everyday driving. CSF has manufactured radiators for decades and validates cooling performance through lab testing, including wind tunnel evaluation.

Key Features

• CSF part number 3784
• OE-style plastic tank and aluminum core construction
• Cross flow design for factory-style cooling layout
• 1-row radiator core configuration
• Inlet and outlet diameters: 1 5/16 in. right inlet, 1 5/16 in. left outlet
• Designed for select Toyota Prius, Toyota Prius Prime, Toyota Corolla, and Lexus UX250h models
• Built to CSF high-performance manufacturing standards

Detailed Description

CSF 3784 is a replacement radiator engineered for vehicles that require an OE-style fit and cooling layout. The aluminum core helps transfer heat efficiently, while the plastic tanks follow the factory-style design used on the listed Toyota and Lexus applications. This makes it a practical choice for drivers looking to restore cooling system performance without changing the original radiator configuration.

Fits 2016-2019 Toyota Prius, N/A. Fits 2017-2020 Toyota Prius Prime, N/A. Fits 2019 Lexus UX250h, N/A. Fits 2020 Toyota Corolla, N/A. This part cross-references Bosch 13591 for the same application.

What It Helps Address

• Overheating caused by a worn or inefficient radiator
• Coolant temperature instability during daily driving
• Leaks associated with aging radiator tanks or core joints
• Reduced cooling efficiency from damaged internal passages
• Fitment issues when replacing an OE-style radiator on listed Toyota and Lexus models

Installation Notes and Tips

Verify core dimensions, inlet and outlet orientation, and mounting layout before installation. This radiator uses a cross flow configuration with a right-side inlet and left-side outlet, so matching the original routing is important. Inspect hoses, clamps, and coolant condition during replacement to help ensure a complete cooling system service.

Quality Assurance

CSF manufactures radiators in ISO/TSO-certified facilities and validates cooling performance through laboratory testing. The brand has supplied radiators worldwide for more than 50 years and has produced over 30 million units across its product range.