CSF 3785 Radiator

CSF 3785 Radiator for Lexus NX300h and Toyota RAV4 Hybrid

CSF 3785 is an OE-style radiator built with an aluminum core and plastic tanks for direct-fit cooling system service. It is engineered and wind tunnel tested for cooling performance validation, making it a practical replacement for select Lexus NX300h and Toyota RAV4 Hybrid applications.

Key Features

• Aluminum core with plastic tanks in an OEM-style construction
• Cross flow design with 1-row core layout
• Core thickness: 1 1/4 in.
• Core size: 16 in. wide x 26 9/16 in. long
• Inlet: 1 1/2 in. left; outlet: 1 1/2 in. right
• Designed for hybrid cooling system fitment on select Lexus and Toyota models
• Part number 3785 for easy identification

Detailed Description

CSF 3785 is a replacement radiator designed around OE-style plastic tanks and an aluminum core to match the factory cooling layout. The cross flow configuration, 1-row core, and 1 1/4-inch core thickness support efficient heat transfer in the specified applications. This radiator fits 2015-2020 Lexus NX300h and 2016-2018 Toyota RAV4 Hybrid models, with a 2021 Lexus NX300h application noted as an upgraded heavy-duty core at 30 mm versus the OEM 27 mm design. This part cross-references Bosch 13515 for the same application.

Common Cooling System Issues Addressed

• Cracked or leaking radiator tanks
• Restricted coolant flow from an aging core
• Overheating caused by reduced heat rejection
• Corrosion or wear in the original radiator assembly
• Cooling system service needs on Lexus NX300h and Toyota RAV4 Hybrid models

Installation Notes and Tips

Verify inlet and outlet orientation before installation: 1 1/2-inch inlet on the left and 1 1/2-inch outlet on the right. Confirm vehicle-specific fitment for the exact model year and hybrid configuration before replacing the radiator. Cap is not included, so reuse or replace the existing cap as needed based on the vehicle’s cooling system specification.

Quality Assurance

CSF states that its factories are ISO/TSO certified and that its radiators are engineered to high performance standards. The brand also notes laboratory wind tunnel testing for cooling performance validation and more than 50 years of radiator manufacturing experience.