CSF 3709 Radiator
OE Quality 60-Day Returns
CSF
 1 Row Plastic Tank Aluminum Core

CSF 3709 Radiator

Brand CSF 3709
Box Height (in) 5 1/16
Box Length (in) 28 1/2
Box Weight (lbs) 10
Box Width (in) 20 9/16
Cap Included No
Core Length 22 13/16
Core Material Aluminum
Core Thickness 1 1/4
Core Width 17 5/8
Down Flow Or Cross Flow Type Cross Flow
Hazardous Material No
Inlet Diameter 1 1/2 Left
Inlet Length (in) 18 1/8
Inlet Width (in) 1 5/8
Outlet Diameter 1 1/2 Right
Outlet Length (in) 18 1/8
Outlet Width (in) 1 5/8
Radiator Core Row Quantity 1
Tank Material Plastic
Tech Note O.E.M. style Plastic tanks & Aluminum core;with quick-connect inlet & outlet pipe.
Product line 1 Row Plastic Tank Aluminum Core
Fits BMW · 60 vehicles

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

Cross-flow construction. Promotes efficient coolant flow through the core.

Quick-connect pipes. Inlet and outlet connections simplify installation.

Cross-references Anchor 2636, Spectra Premium CU2636 and 17 11 9 071 519 for the same application. See all 4.

$102.22Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
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Step 2 — Quantity
Order total $102.22
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
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BMW Z4 and E46 Cooling Replacement

CSF Radiator 3709 is an OE-style replacement built with a plastic tank and aluminum core for direct-fit cooling service. It is engineered for BMW applications that need a cross flow radiator with quick-connect inlet and outlet pipe connections, including BMW Z4 and select E46 3 Series models.

Key Features

  • OE-style plastic tank and aluminum core construction
  • 1-row cross flow design for factory-style cooling layout
  • Core thickness: 1 1/4 in.
  • Core dimensions: 17 5/8 in. wide x 22 13/16 in. long
  • 1 1/2 in. left inlet and 1 1/2 in. right outlet
  • Quick-connect inlet and outlet pipe design
  • No radiator cap included
  • CSF part number 3709

Product Details

CSF 3709 is part of the brand’s 1 Row Plastic Tank Aluminum Core line, a product family focused on OE-style radiator construction for factory fitment and consistent cooling performance. CSF manufactures radiators to high-performance standards and validates designs through laboratory wind tunnel testing. With broad manufacturing coverage across thousands of radiator models, CSF supports a wide range of BMW cooling system replacement needs. This radiator cross-references CSF 3709 and Spectra Premium CU2636 for the same application.

What This Radiator Helps Address

  • Overheating caused by a leaking or restricted radiator
  • Cracked or aged plastic end tanks
  • Reduced cooling efficiency from a clogged core
  • Coolant loss at the inlet or outlet connection points
  • Factory-style replacement needs on BMW Z4 and E46 3 Series vehicles

Installation Notes and Tips

  • Fits 2003-2008 BMW Z4, N/A
  • Fits 2006 BMW 323i, N/A
  • Fits 1999-2001 BMW 323i, N/A
  • Fits 2001-2006 BMW 325Ci, N/A
  • Fits 2001-2006 BMW 325i, N/A
  • Fits 2001-2006 BMW 330Ci, N/A
  • Fits 2001-2006 BMW 330i, N/A
  • Fits 2001-2006 BMW 330xi, N/A
  • Fits 2001-2005 BMW 320i, N/A
  • Fits 2001-2005 BMW 325xi, N/A
  • Fits 2000 BMW 323Ci, N/A
  • Fits 2000 BMW 328Ci, N/A
  • Fits 2000 BMW 328i, N/A
  • Fits 1999 BMW 328i, N/A
  • Verify inlet and outlet orientation before installation and confirm the quick-connect pipe style matches the original radiator.
  • Inspect hoses, clamps, and cooling system seals during replacement to help prevent repeat leaks.

Quality Assurance

CSF radiators are manufactured in ISO/TSO-certified facilities and built to support OE-style fitment and cooling performance. The design process includes laboratory wind tunnel validation, and the brand has supplied radiators worldwide for more than 50 years.

Related reading

This part fits 60 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelTransmissionLitersCylindersPositionNotes
2008BMWZ4Automatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2008BMWZ4Automatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2007BMWZ4Automatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2007BMWZ4Automatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2006BMW323iAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2006BMW325CiAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2006BMW325iAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2006BMW330CiAutomatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2006BMW330iAutomatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2006BMW330xiAutomatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2006BMWZ4Automatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2006BMWZ4Automatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2005BMW320iAutomatic2.2LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2005BMW325CiAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2005BMW325iAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2005BMW325xiAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2005BMW330CiAutomatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2005BMW330iAutomatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2005BMW330xiAutomatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2005BMWZ4Automatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2005BMWZ4Automatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2004BMW320iAutomatic2.2LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2004BMW325CiAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2004BMW325iAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2004BMW325xiAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2004BMW330CiAutomatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2004BMW330iAutomatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2004BMW330xiAutomatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2004BMWZ4Automatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2004BMWZ4Automatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2003BMW320iAutomatic2.2LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2003BMW325CiAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2003BMW325iAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2003BMW325xiAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2003BMW330CiAutomatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2003BMW330iAutomatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2003BMW330xiAutomatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2003BMWZ4Automatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2003BMWZ4Automatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2002BMW320iAutomatic2.2LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2002BMW325CiAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2002BMW325iAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2002BMW325xiAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2002BMW330CiAutomatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2002BMW330iAutomatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2002BMW330xiAutomatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2001BMW320iAutomatic2.2LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2001BMW323iAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2001BMW325CiAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2001BMW325iAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2001BMW325xiAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2001BMW330CiAutomatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2001BMW330iAutomatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2001BMW330xiAutomatic3.0LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2000BMW323CiAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2000BMW323iAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2000BMW328CiAutomatic2.8LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
2000BMW328iAutomatic2.8LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
1999BMW323iAutomatic2.5LL6N/AOE style design ensures optimal fitment and performance.; 1 Row Plastic Tank Aluminum Core
1999BMW328iAutomatic2.8LL6N/AOE Style Design; w/ E46 Body Code; 1 Row Plastic Tank Aluminum Core
Directly replaces or cross-references 4 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Anchor — 2636Spectra Premium — CU263617 11 9 071 519BM3010107