CSF 3451 Radiator
OE Quality 60-Day Returns
CSF
 1 Row Plastic Tank Aluminum Core

CSF 3451 Radiator

Brand CSF 3451
Box Height (in) 6 5/8
Box Length (in) 32
Box Weight (lbs) 10
Box Width (in) 20
Cap Included No
Core Length 24 15/16
Core Material Aluminum
Core Thickness 7/8
Core Width 15 1/4
Down Flow Or Cross Flow Type Cross Flow
Hazardous Material No
Inlet Diameter 1 1/4 Left
Inlet Length (in) 16 1/16
Inlet Width (in) 1 9/16
Oil Cooler (in) 11 13/16 (high-efficiency Plate Type)
Outlet Diameter 1 1/4 Left
Outlet Length (in) 16 1/16
Outlet Width (in) 1 9/16
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 Audi · 35 vehicles

OE-style design. Plastic tanks and an aluminum core with quick-connect inlet and outlet pipes.

Cross-flow construction. Engineered for efficient cooling performance and validation in lab testing.

ISO/TSO certified. Built to high performance standards and supplied worldwide for decades.

Cross-references Anchor 2823, APDI 8012556 and 8E0 121 251 AE for the same application. See all 8.

$124.76Free shipping
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OE-Style Radiator for Audi A4 and A4 Quattro

CSF Radiator 3451 is a direct-fit cooling replacement built with an OEM-style plastic tank and aluminum core design. It is engineered for Audi A4 and Audi A4 Quattro applications with standard transmission fitment, offering the dimensions and connection layout needed for a proper radiator replacement.

Key Features

  • 1-row cross-flow radiator design
  • Aluminum core with plastic tanks
  • Core thickness: 7/8 in.
  • Core size: 24 15/16 in. length x 15 1/4 in. width
  • Inlet and outlet: 1 1/4 in., left-side configuration
  • Quick-connect inlet and outlet pipe style
  • Integrated high-efficiency plate-type oil cooler, 11 13/16 in.
  • Cap not included

Product Details

CSF 3451 is part of the brand’s 1 Row Plastic Tank Aluminum Core line, a product family focused on OE-style radiator construction for common passenger vehicles. CSF manufactures a wide range of radiator applications and states that its cooling products are engineered and wind-tunnel tested for cooling performance validation. For Audi A4 and Audi A4 Quattro owners, this radiator provides the correct cross-flow layout, left-side inlet and outlet placement, and standard-transmission fitment details needed for a clean replacement.

This part cross-references APDI 8012556 and Anchor 2823 for the same application. Fits 2013-2016 Audi A4, N/A; Fits 2009-2010 Audi A4, N/A; Fits 2011-2012 Audi A4, N/A; Fits 2007-2008 Audi A4, N/A; Fits 2002-2008 Audi A4, N/A; Fits 2002-2016 Audi A4 Quattro, N/A.

Common Problems This Radiator Can Address

  • Coolant leaks from a cracked or aging plastic tank
  • Reduced cooling efficiency from a clogged or corroded core
  • Overheating caused by restricted coolant flow
  • Transmission cooling concerns on applications with an integrated oil cooler
  • Fitment issues when replacing an OE-style Audi A4 radiator

Installation Notes and Tips

Verify the vehicle’s transmission type before ordering, since this radiator is listed for standard transmission applications. Confirm inlet and outlet orientation, core dimensions, and the left-side connection layout against the original unit before installation. Inspect hoses, seals, and mounting points during replacement to help ensure a proper seal and stable fit.

Quality Assurance

CSF states that its factories are ISO/TSO certified and that its radiators are built to high-performance standards. The brand also notes long-term global production experience and laboratory testing used to validate cooling performance.

Related reading

This part fits 35 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelTransmissionLitersCylindersPositionNotes
2016AudiA4—2.0LL4N/Aw/ Standard Trans.; 1 Row Plastic Tank Aluminum Core
2016AudiA4 QuattroManual2.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2015AudiA4—2.0LL4N/Aw/ Standard Trans.; 1 Row Plastic Tank Aluminum Core
2015AudiA4 QuattroManual2.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2014AudiA4—2.0LL4N/Aw/ Standard Trans.; 1 Row Plastic Tank Aluminum Core
2014AudiA4 QuattroManual2.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2013AudiA4—2.0LL4N/Aw/ Standard Trans.; 1 Row Plastic Tank Aluminum Core
2013AudiA4 QuattroManual2.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2012AudiA4Manual2.0LL4N/A1 Row Plastic Tank Aluminum Core
2012AudiA4 QuattroManual2.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2011AudiA4Manual2.0LL4N/A1 Row Plastic Tank Aluminum Core
2011AudiA4 QuattroManual2.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2010AudiA4—2.0LL4N/Aw/ Standard Trans.; 1 Row Plastic Tank Aluminum Core
2010AudiA4 QuattroManual2.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2009AudiA4—2.0LL4N/Aw/ Standard Trans.; 1 Row Plastic Tank Aluminum Core
2009AudiA4 QuattroManual2.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2008AudiA4—2.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2008AudiA4—1.8LL4N/A1 Row Plastic Tank Aluminum Core
2008AudiA4 Quattro—2.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2007AudiA4—1.8LL4N/A1 Row Plastic Tank Aluminum Core
2007AudiA4—2.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2007AudiA4 Quattro—2.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2006AudiA4—1.8LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2006AudiA4—2.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2006AudiA4 Quattro—2.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2005AudiA4—1.8LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2005AudiA4—2.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2005AudiA4 Quattro—1.8LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2005AudiA4 Quattro—2.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2004AudiA4—1.8LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2004AudiA4 Quattro—1.8LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2003AudiA4—1.8LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2003AudiA4 Quattro—1.8LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2002AudiA4—1.8LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2002AudiA4 Quattro—1.8LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
Directly replaces or cross-references 8 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Anchor — 2823APDI — 80125568E0 121 251 AE8E0 121 251 AP8E0 121 251 AQ8E0 121 251 B8E0 121 251 LAU3010128