CSF 3391 Radiator
OE Quality 60-Day Returns
CSF
 1 Row Plastic Tank Aluminum Core

CSF 3391 Radiator

Brand CSF 3391
Box Height (in) 5 1/16
Box Length (in) 30 5/8
Box Weight (lbs) 10
Box Width (in) 21 15/16
Cap Included No
Core Length 14 3/16
Core Material Aluminum
Core Thickness 5/8
Core Width 27
Csf Cap Number 4540
Down Flow Or Cross Flow Type Down Flow
Hazardous Material No
Inlet Diameter 1 1/2 Right
Inlet Length (in) 27 13/16
Inlet Width (in) 1 5/8
Oil Cooler (in) 14 3/4 (high-effeciency Concentric Type)
Outlet Diameter 1 9/16 Left
Outlet Length (in) 27 13/16
Outlet Width (in) 2
Radiator Core Row Quantity 1
Tank Material Plastic
Tech Note O.E.M. style Plastic tanks & Aluminum core;Manufactured with steel crimp strips to strengthen Radiator by 40% over O.E.
Product line 1 Row Plastic Tank Aluminum Core
Fits Subaru · 3 vehicles

OE-style construction. Plastic tanks and an aluminum core deliver a familiar replacement design.

Reinforced core. Steel crimp strips strengthen the radiator by 40% over OE.

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

Cross-references APDI 8012674, OSC 13021 and 45119SA060 for the same application. See all 5.

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CSF 3391 Radiator for Subaru Forester

The CSF 3391 is an OE-style radiator built with a plastic tank and aluminum core for the 2006-2008 Subaru Forester. It is engineered for direct replacement service with down-flow construction and factory-style hose connections for a clean fit in the cooling system.

Key Features

  • Brand: CSF
  • Part number: 3391
  • 1-row radiator design
  • Plastic tank and aluminum core construction
  • Down-flow configuration
  • Core thickness: 5/8 in.
  • Core width: 27 in.
  • Core length: 14 3/16 in.
  • Inlet diameter: 1 1/2 in., right side
  • Outlet diameter: 1 9/16 in., left side
  • OE-style plastic tanks with steel crimp strips for added strength

Product Details

CSF manufactures radiators to high-performance standards and validates cooling performance through laboratory wind-tunnel testing. The 3391 radiator follows an OEM-style layout with plastic tanks and an aluminum core, making it a practical replacement for Subaru Forester cooling system service. This part cross-references APDI 8012674 for the same application.

Compatible With 2006-2008 Subaru Forester, N/A. The fitment notes specify OE-style design and use of a Mini, 20 psi cap. Search terms such as Subaru Forester radiator replacement, 2006 Subaru Forester cooling system radiator, and 2008 Subaru Forester OE-style radiator all align with this application.

Common Problems This Part Can Address

  • Coolant leaks from a cracked or aging radiator tank
  • Reduced cooling efficiency from a clogged or corroded core
  • Overheating caused by radiator flow restriction
  • Damaged inlet or outlet connections
  • Cooling system service on a Subaru Forester with OE-style dimensions

Installation Notes

Verify inlet and outlet orientation before installation. The fitment notes call for a Mini, 20 psi cap, and the radiator is supplied without a cap. Confirm hose routing, mounting points, and clearance against the original unit before final assembly. This radiator is designed for 2006-2008 Subaru Forester applications listed in the fitment data.

Quality Assurance

CSF states that its factories are ISO/TSO certified and that its radiators are engineered and tested for cooling performance validation. The brand also reports more than 50 years of radiator production experience and a broad catalog covering many vehicle applications.

Related reading

This part fits 3 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2008SubaruForester2.5LH4N/AOE Style Design; Use Mini, 20 psi Cap; 1 Row Plastic Tank Aluminum Core
2007SubaruForester2.5LH4N/AOE Style Design; Use Mini, 20 psi Cap; 1 Row Plastic Tank Aluminum Core
2006SubaruForester2.5LH4N/AOE Style Design; Use Mini, 20 psi Cap; 1 Row Plastic Tank Aluminum Core
Directly replaces or cross-references 5 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
APDI — 8012674OSC — 1302145119SA0608013021SU3010649