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CSF 3451 RadiatorOE Quality 60-Day Returns
Part #: 3451

CSF 3451 Radiator

1 Row Plastic Tank Aluminum Core
⚙️ 35 vehicles fit this part
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Select your vehicle to confirm fitment
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✅ In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
✅OE Direct Replacement — Bolt-on fit, no modifications needed
📦1 Row Plastic Tank Aluminum Core
🚗Fitment: Audi, A4 and A4 Quattro
🔄Easy Returns — Return within 60 days for a full refund
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Overview of CSF 3451 Radiator for Audi A4 and A4 Quattro

The CSF 3451 radiator is designed specifically for Audi A4 and A4 Quattro models, providing reliable cooling performance with a durable aluminum core and plastic tanks. This radiator features a single-row core construction optimized for efficient heat dissipation in a compact design.

  • Core thickness: 7/8 inch
  • Core width: 15 1/4 inches
  • Core length: 24 15/16 inches
  • Aluminum core material with plastic tanks
  • Cross flow design for effective coolant circulation
  • Inlet and outlet diameter: 1 1/4 inches, positioned on the left side
  • Includes a high-efficiency plate type oil cooler measuring 11 13/16 inches
  • Does not include radiator cap

Details on the 1 Row Plastic Tank Aluminum Core Product Line

The CSF 1 Row Plastic Tank Aluminum Core product line combines OEM-style plastic tanks with a robust aluminum core to deliver dependable cooling solutions. This line focuses on maintaining proper engine temperatures while ensuring compatibility with specific vehicle models. The single-row core design balances cooling efficiency with a compact form factor, making it suitable for Audi A4 and A4 Quattro applications requiring precise fitment and performance.

Technical Description of CSF Part Number 3451

The CSF 3451 radiator features a 7/8 inch thick aluminum core that measures 15 1/4 inches in width and 24 15/16 inches in length. Its cross flow configuration allows coolant to move horizontally through the core, enhancing heat exchange efficiency. The plastic tanks on this radiator are engineered to match OEM specifications, ensuring a secure fit and reliable sealing. Both the inlet and outlet ports are 1 1/4 inches in diameter and located on the left side, facilitating straightforward hose connections. Additionally, the integrated high-efficiency plate type oil cooler supports engine oil temperature regulation, contributing to overall engine performance and longevity.

Applications and Common Issues Addressed

  • Replacement for leaking or damaged radiators in Audi A4 and A4 Quattro vehicles
  • Resolves overheating caused by inefficient or clogged radiator cores
  • Addresses coolant leaks from cracked plastic tanks
  • Improves engine oil cooling with integrated oil cooler functionality
  • Restores proper coolant flow with OEM-style inlet and outlet connections

Installation Notes and Tips

When installing the CSF 3451 radiator, ensure compatibility with your Audi A4 or A4 Quattro model year and engine configuration. Verify that the inlet and outlet hose diameters match your vehicle’s hoses for a secure fit. Since this radiator does not include a cap, reuse the existing radiator cap or source an appropriate replacement. Properly bleed the cooling system after installation to remove air pockets and maintain optimal coolant circulation. Handle the plastic tanks carefully during installation to avoid damage.

Quality Assurance and Warranty Information

CSF radiators, including part number 3451, are manufactured to meet or exceed OEM standards for durability and performance. The aluminum core and plastic tank construction undergo rigorous quality control to ensure long service life. While specific warranty details may vary, CSF products typically include a limited warranty against defects in materials and workmanship. Consult product documentation or the supplier for exact warranty terms related to this radiator.

BrandCSF
Part Number3451
Position1 Row Plastic Tank Aluminum Core
Box Height (in)6 5/8
Box Length (in)32
Box Weight (lbs)10
Box Width (in)20
Cap IncludedNo
Core Length24 15/16
Core MaterialAluminum
Core Thickness7/8
Core Width15 1/4
Down Flow Or Cross Flow TypeCross Flow
Hazardous MaterialNo
Inlet Diameter1 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 Diameter1 1/4 Left
Outlet Length (in)16 1/16
Outlet Width (in)1 9/16
Radiator Core Row Quantity1
Tank MaterialPlastic
Tech NoteO.E.M. style Plastic tanks & Aluminum core;with quick-connect inlet & outlet pipe.

This part fits 35 vehicles. Search below:

YearMakeModelTransmissionLitersCylindersPositionNotes
2016AudiA42.0LL4N/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
2015AudiA42.0LL4N/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
2014AudiA42.0LL4N/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
2013AudiA42.0LL4N/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
2010AudiA42.0LL4N/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
2009AudiA42.0LL4N/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
2008AudiA42.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2008AudiA41.8LL4N/A1 Row Plastic Tank Aluminum Core
2008AudiA4 Quattro2.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2007AudiA41.8LL4N/A1 Row Plastic Tank Aluminum Core
2007AudiA42.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2007AudiA4 Quattro2.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2006AudiA41.8LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2006AudiA42.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2006AudiA4 Quattro2.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2005AudiA41.8LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2005AudiA42.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2005AudiA4 Quattro1.8LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2005AudiA4 Quattro2.0LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2004AudiA41.8LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2004AudiA4 Quattro1.8LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2003AudiA41.8LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2003AudiA4 Quattro1.8LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2002AudiA41.8LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core
2002AudiA4 Quattro1.8LL4N/AOE Style Design; Includes O-Ring OD 39.3 x ID 30.8 x 4.25mm; 1 Row Plastic Tank Aluminum Core

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

282380125568E0 121 251 AE8E0 121 251 AP8E0 121 251 AQ8E0 121 251 B8E0 121 251 LAU3010128

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

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