CSF 3774 Drive Motor Inverter Cooler

CSF 3774 Inverter Cooler Overview

CSF 3774 is an OE-style drive motor inverter cooler built with a 1-row plastic tank and aluminum core design. It is engineered for direct replacement use on select Toyota Prius and Prius Plug-In applications, with fitment covering 2010-2015 Toyota Prius and 2012-2015 Toyota Prius Plug-In.

Key Features

• Brand line: 1-row plastic tank aluminum core construction
• Core material: aluminum with plastic end tanks
• Cross-flow design for inverter cooling applications
• Core thickness: 7/8 in.
• Core width: 2 3/8 in.
• Core length: 23 9/16 in.
• Inlet diameter: 11/16 in., right side
• Outlet diameter: 11/16 in., left side
• OEM-style plastic tanks and aluminum core
• Part number: 3774

Product Details

This CSF inverter cooler is built to match the OE-style layout used in select Toyota hybrid cooling systems. The cross-flow configuration, single-row core, and compact tank-and-core construction support proper coolant routing for inverter temperature control in Prius and Prius Plug-In models. CSF states its radiators and cooling products are manufactured to high performance standards, with engineering validation that includes wind tunnel testing and broad application coverage across many vehicle platforms. This part number, 3774, is a direct-fit cooling component for 2010-2015 Toyota Prius and 2012-2015 Toyota Prius Plug-In applications.

CSF has produced cooling components for decades and supplies a wide range of radiator models for global vehicle coverage. For buyers searching Toyota Prius inverter cooler replacement, Toyota Prius Plug-In inverter cooler, or CSF 3774 radiator-style cooling hardware, this unit provides the OE-style plastic tank and aluminum core format specified for the listed applications.

Common Issues This Part May Address

• Damaged or leaking inverter cooler assembly
• Restricted coolant flow through the inverter cooling circuit
• Corrosion or deterioration in the original cooling core
• Cracked plastic tank or aged tank-to-core sealing surfaces
• Cooling system service needs on Toyota Prius hybrid models

Installation Notes and Tips

Verify inlet and outlet orientation before installation: inlet is on the right and outlet is on the left. Confirm the OE-style dimensions and cross-flow layout against the removed unit before assembly. Transfer only the components required by the vehicle service procedure, and inspect hoses, clamps, and coolant condition while the cooling system is open. This part cross-references Toyota 16410-AZ020 and TO3011100 for the same application.

Quality Assurance

CSF manufactures cooling products in ISO/TSO-certified facilities and validates designs through engineering and performance testing. The 3774 follows an OE-style plastic tank and aluminum core construction intended to match the listed Toyota Prius and Prius Plug-In applications.