CSF 3644 Radiator

OE-Style Radiator for Honda and Acura Applications

CSF radiator 3644 is an OE-style cooling replacement built with a plastic tank and aluminum core layout. It is engineered for direct-fit service on select Honda Passport, Honda Ridgeline, Honda Pilot, and Acura MDX applications, with fitment coverage spanning 2014-2025 depending on model.

The CSF 1 Row Plastic Tank Aluminum Core line focuses on factory-style construction with performance validation in controlled testing. For buyers searching for a Honda Pilot radiator, Honda Ridgeline radiator, or Acura MDX radiator replacement, this part number 3644 follows the original equipment design approach while using a single-row aluminum core for efficient heat transfer.

Key Features

• CSF part number 3644
• 1-row down-flow radiator design
• Aluminum core with plastic tanks
• Core thickness: 1 1/4 in.
• Core width: 30 1/16 in.
• Core length: 19 11/16 in.
• Inlet diameter: 1 1/4 left
• Outlet diameter: 1 1/4 left
• OE-style plastic tank and aluminum core construction
• No cap included

Detailed Description

CSF 3644 is built for drivers who need a radiator replacement that matches factory-style packaging and cooling layout. The down-flow configuration, single-row core, and OE-style tank construction are suited to vehicles that require a direct replacement radiator with the same inlet and outlet orientation. CSF manufactures a wide range of radiator models and uses engineering and wind-tunnel validation methods to confirm cooling performance across its product line.

This radiator is listed for 2021-2025 Honda Passport, 2021-2025 Honda Ridgeline, 2022 Honda Pilot, 2016-2021 Honda Pilot, 2014-2020 Acura MDX, 2019-2020 Honda Passport, and 2017-2020 Honda Ridgeline. If you are replacing a Honda Passport radiator or Honda Ridgeline radiator, CSF 3644 provides the OE-style fitment and core layout needed for a clean service replacement. This part cross-references 19010-5J6-A01 and AC3010153 for the same application.

What This Radiator Helps Address

• Overheating caused by a leaking or restricted radiator
• Coolant loss from cracked plastic tanks or aged seams
• Reduced heat rejection from a damaged or clogged core
• Temperature instability during stop-and-go driving or towing
• Service replacement needs after collision or corrosion damage

Installation Notes and Tips

Verify inlet and outlet orientation, core dimensions, and vehicle year before installation. This radiator uses a down-flow layout with left-side inlet and outlet placement, so matching the original configuration is important for proper routing and fit. Inspect hoses, clamps, and coolant condition during replacement, and confirm the cooling system is fully bled after installation.

Quality Assurance

CSF states that its factories are ISO/TSO certified and that its radiators are engineered to high-performance standards with laboratory cooling validation. The brand also notes more than 50 years of radiator production experience and over 30 million units sold worldwide.