CSF 3640 Radiator
OE Quality 60-Day Returns
CSF
 1 Row Plastic Tank Aluminum Core

CSF 3640 Radiator

Brand CSF 3640
Box Height (in) 7 4/16
Box Length (in) 33
Box Weight (lbs) 10
Box Width (in) 23 9/16
Cap Included No
Core Length 25 1/16
Core Material Aluminum
Core Thickness 5/8
Core Width 18 15/16
Csf Cap Number 4503
Down Flow Or Cross Flow Type Cross Flow
Hazardous Material No
Inlet Diameter 1 3/8 Right
Inlet Length (in) 19
Inlet Width (in) 1 9/16
Oil Cooler (in) 13 3/4 (high-effeciency Concentric Type)
Outlet Diameter 1 3/8 Left
Outlet Length (in) 19
Outlet Width (in) 1 9/16
Radiator Core Row Quantity 1
Tank Material Plastic
Tech Note O.E.M. style Plastic tanks & Aluminum core.
Product line 1 Row Plastic Tank Aluminum Core
Fits Kia and Hyundai · 11 vehicles

OE-style design. Plastic tanks and an aluminum core match the original construction.

Cross-flow layout. Promotes efficient coolant movement through the radiator.

Wind tunnel tested. Validated for cooling performance in lab testing.

Cross-references APDI 8013191, Bosch 13190 and Bosch 13191 for the same application. See all 12.

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Free returns within 60 days if it doesn't fit when fitment is verified.
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OE-Style Radiator for Kia and Hyundai Applications

CSF 3640 is an OE-style radiator built with a plastic tank and aluminum core layout for direct replacement service. It is engineered for cross-flow cooling performance and is listed for select Kia Cadenza, Kia Optima, and Hyundai Sonata applications.

Key Features

  • 1-row radiator design with a 5/8 in. core thickness
  • Aluminum core with plastic tanks for OE-style construction
  • Cross-flow configuration with right-side inlet and left-side outlet
  • Core dimensions: 18 15/16 in. wide by 25 1/16 in. long
  • Integrated high-efficiency concentric-type oil cooler, 13 3/4 in.
  • Built by CSF, a manufacturer with ISO/TSO-certified factories and wind-tunnel tested cooling validation

Product Details

CSF 3640 is designed for drivers needing a direct-fit radiator replacement for 2011-2015 Kia Optima, 2014-2016 Kia Cadenza, and 2011-2013 Hyundai Sonata applications. The OE-style plastic tank and aluminum core construction follows the factory layout while supporting consistent coolant flow through the cross-flow design. CSF manufactures more than 10,000 radiator models and supplies cooling components for a wide range of vehicle platforms, with production backed by laboratory testing for cooling performance validation. This part cross-references Spectra Premium CU13189 and CU13191 for the same application.

Common Reasons to Replace the Radiator

  • Coolant leaks from aging plastic tanks or core seams
  • Overheating caused by restricted coolant flow
  • Corrosion or internal buildup in the radiator core
  • Temperature instability during stop-and-go driving
  • Cooling system service on a Kia Optima, Kia Cadenza, or Hyundai Sonata

Installation Notes

Verify inlet and outlet orientation before installation: inlet is 1 3/8 in. on the right and outlet is 1 3/8 in. on the left. Confirm radiator dimensions and oil cooler routing against the original unit before removal. The cap is not included, and the correct CSF cap number is 4503 if your application requires it.

Quality Assurance

CSF radiators are produced in ISO/TSO-certified factories and validated through cooling-performance testing. The brand states that its radiators are engineered to high-performance standards and supplied worldwide across a broad range of vehicle applications.

Related reading

This part fits 11 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2016KiaCadenza3.3LV6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2015KiaCadenza3.3LV6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2015KiaOptima2.4LL4N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2014KiaCadenza3.3LV6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2014KiaOptima2.4LL4N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2013HyundaiSonata2.4LL4N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2013KiaOptima2.4LL4N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2012HyundaiSonata2.4LL4N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2012KiaOptima2.4LL4N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2011HyundaiSonata2.4LL4N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2011KiaOptima2.4LL4N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
Directly replaces or cross-references 12 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
APDI — 8013191Bosch — 13190Bosch — 13191Partslink Numbering System — HY3010171Spectra Premium — CU13189Spectra Premium — CU1319125310-3Q00025310-3Q50025310-3R50025310-3S00025310-3S00125310-3S651