CSF Audi B5 A4 1.8T High-Performance All-Aluminum Radiator

With over five decades of expertise in radiator manufacturing, CSF stands as a leader in delivering superior cooling solutions. The CSF Audi B5 A4 1.8T High-Performance All-Aluminum Radiator exemplifies this commitment, engineered to maintain optimal engine temperatures and enhance the performance of your B5 A4 1.8T. Whether for daily driving or competitive motorsports, this radiator is meticulously designed to meet the rigorous demands of high horsepower applications and race environments requiring exceptional cooling capacity. This radiator incorporates a 2-Row core featuring CSF’s proprietary B-Tube Technology. Unlike conventional oval “O” type tubes, the innovative “B” shaped tubes are precision-formed and seam-brazed to achieve superior strength and durability. This advanced design allows the use of thinner, lighter aluminum material without compromising structural integrity, resulting in improved cooling efficiency. The unique inlet positioned in the middle of the brazed seam increases the heat transfer surface area by approximately 15% compared to standard tubes, effectively delivering the cooling performance of two smaller tubes within the same spatial constraints. Additionally, the “B-tubes” facilitate dual liquid laminar flow, optimizing coolant movement through the radiator. Complementing this design, CSF employs ultra-efficient multi-louvered fins that are precisely aligned to maximize airflow across the radiator core. Each fin’s dimensions and orientation are carefully calculated and validated through extensive wind-tunnel testing to ensure maximum heat rejection efficiency, providing reliable cooling under demanding conditions. The CSF B5 A4 1.8T radiator is engineered as a true “Drop-in fit” replacement, requiring no modifications for installation. All mounting brackets are CNC machined and welded to OE specifications, ensuring exceptional durability and precise fitment. The inlet and outlet connections are designed to match OEM configurations, allowing seamless integration with existing hoses—whether OEM or aftermarket—simplifying the upgrade process. Features 2-Row, 42mm Ultra-High-Performance Dual Pass Core for enhanced cooling capacity 45 Cooling Tubes utilizing CSF’s exclusive B-Tube Technology for superior heat transfer 6.5mm Tall Ultra Efficient Fins with Multi-Louvered Design to maximize surface area contact and airflow CNC Machined Mounting Brackets and OEM Style Inlet/Outlet connections for precise fit and durability Constructed from 100% All Aluminum with TIG-Welded joints ensuring strength and corrosion resistance Finished with a Smooth Satin coating for added protection and aesthetic appeal True Plug-and-Play “Drop-in Fit” installation requiring absolutely no modifications Designed exclusively for Manual Transmission applications Each unit is individually Leak and Pressure Tested to guarantee reliability Backed by a 2-Year Limited Warranty for peace of mind Applications Year Range Make Chassis Code Model Trim Engine / Trans / Etc Notes 1998 Audi B5 A4 Avant Turbocharged 1.8L L4 (Manual) – 1997-2001 Audi B5 A4 – Turbocharged 1.8L L4 (Manual) – 1998-2001 Audi B5 A4 Quattro Avant Turbocharged 1.8L L4 (Manual) – 1997-2001 Audi B5 A4 Quattro – Turbocharged 1.8L L4 (Manual) – 1998-2001 Volkswagen – Passat GLS Turbocharged 1.8L L4 (Manual) – OEM Part Numbers Audi: 8D0 121 251 P Audi: 8D0-121-251-P Audi: 8D0121251P Warranty Cooling Systems and Flexibles, Inc. (CSF) guarantees the quality and performance of its High-Performance Cooling Systems under normal use and service to the original purchaser of the vehicle in which the product was originally installed. For comprehensive warranty details, please visit our Warranty Page. SKU# 7204 Warranty Term: 2 years In summary, the CSF Audi B5 A4 1.8T High-Performance All-Aluminum Radiator represents a pinnacle of engineering excellence, combining innovative design with precision manufacturing to deliver reliable, efficient cooling. Its robust construction, advanced B-Tube Technology, and meticulous testing ensure that your vehicle maintains optimal operating temperatures under all conditions, safeguarding engine performance and longevity. Trust CSF to provide a high-quality, durable radiator that meets the exacting standards of both enthusiasts and professional racers alike.