CSF 3851 Radiator

CSF 3851 Radiator for Honda Accord

The CSF 3851 radiator is an OE-style replacement built for 2018-2022 Honda Accord applications. It combines a plastic tank design with an aluminum core and an upgraded heavy-duty core thickness for direct-fit cooling system service.

Key Features

• OE-style plastic tanks with aluminum core construction
• Upgraded heavy-duty core, 11% thicker than OEM 27mm
• Down-flow radiator design
• Core thickness: 1 1/4 in.
• Core width: 29 11/16 in.; core length: 15 11/16 in.
• Inlet and outlet diameter: 1 1/4 in., left side
• No radiator cap supplied
• Part number: 3851

Detailed Description

Built for Honda Accord cooling system replacement, the CSF 3851 radiator follows an OE-style layout with plastic tanks and an aluminum core for proper fitment and thermal performance. The heavy-duty core design increases thickness to 30mm, giving this radiator an 11% thicker core than the OEM 27mm specification noted by the manufacturer. That added core depth supports improved heat exchange capacity while maintaining the factory-style configuration expected in a direct replacement radiator. This part number 3851 is listed for 2018-2021 Honda Accord and 2022 Honda Accord applications, making it a focused choice for Accord owners needing a replacement radiator with factory-style dimensions and connections.

This part cross-references Spectra Premium CU13674 for the same application.

Common Problems It Can Address

• Coolant leaks from a damaged or aging radiator tank
• Restricted cooling performance from a clogged or corroded core
• Overheating caused by reduced heat transfer efficiency
• Cracked plastic end tanks from heat cycling and age
• Fitment issues when replacing a worn OE-style Honda Accord radiator

Installation Notes and Tips

Verify inlet and outlet orientation before installation, as this radiator uses left-side inlet and outlet connections. Confirm the vehicle is a 2018-2022 Honda Accord and compare core dimensions, hose sizes, and mounting points against the original unit before removal. Transfer any vehicle-specific components not supplied with the radiator, and refill the cooling system with the correct coolant mixture after installation. Bleed air from the system according to Honda service procedures to help prevent hot spots and temperature fluctuations.

Quality Assurance

CSF manufactures this radiator with OE-style plastic tanks and an aluminum core, along with an upgraded heavy-duty core specification for the listed Honda Accord applications. The design and dimensions are intended to match factory-style replacement requirements for 2018-2022 Honda Accord cooling system service.