CSF 3678 Drive Motor Inverter Cooler

OE-Style Inverter Cooler for Hybrid Cooling

CSF 3678 is an OE-style drive motor inverter cooler built with a 1-row aluminum core and plastic tanks. It is designed for hybrid cooling service on select Kia Optima and Hyundai Sonata applications, with fitment matched to the original layout and hose locations.

CSF’s radiator and cooler manufacturing focuses on engineered fitment and validated cooling performance, using factory-style construction for direct replacement service. Part number 3678 is a practical choice when replacing a worn or leaking inverter cooler on the listed hybrid vehicles.

Key Features

• 1-row plastic tank and aluminum core construction
• Cross-flow design for OE-style cooling layout
• Core thickness: 7/8 in.
• Core length: 25 1/16 in.; core width: 2 11/16 in.
• Inlet: 11/16 in. right; outlet: 11/16 in. left
• Cap not included
• OE-style plastic tanks and aluminum core

Product Details

CSF 3678 is built as a direct-fit drive motor inverter cooler for hybrid cooling systems. The aluminum core helps transfer heat efficiently, while the plastic tanks follow the original equipment style used on the vehicle platform. This part number 3678 is engineered for the 2011-2016 Kia Optima and 2011-2015 Hyundai Sonata hybrid applications listed below, making it a focused replacement for vehicles that need the correct inlet and outlet orientation.

This part cross-references Spectra Premium CU13478 and BBB Industries 13468 for the same application.

Common Replacement Reasons

• Coolant seepage from aging plastic tank seams
• Restricted inverter cooling from internal wear or contamination
• Physical damage to the cooler core or end tanks
• Incorrect cooling performance after a failed OE unit
• Need for an OE-style replacement on a hybrid cooling system

Installation Notes

Verify inlet and outlet orientation before installation: inlet is on the right and outlet is on the left. Confirm the core dimensions and OE-style mounting points against the removed unit before assembly. This cooler is listed for hybrid applications on the Kia Optima and Hyundai Sonata, so match the vehicle year and configuration carefully before installation.

• Fits 2011-2016 Kia Optima, N/A; OE Style Design; Hybrid; 1 Row Plastic Tank Aluminum Core
• Fits 2011-2015 Hyundai Sonata, N/A; OE Style Design; Hybrid; 1 Row Plastic Tank Aluminum Core

Quality Assurance

CSF manufactures cooling components to ISO/TSO-certified factory standards and validates designs through engineering and wind-tunnel testing for cooling performance. The brand has supplied radiators worldwide for decades and produces a broad range of OE-style cooling components for vehicle applications.