CSF 06-09 VW Golf / GTI / 99-06 Jetta / GLI High-Performance All-Aluminum Radiator

With over five decades of specialized expertise in radiator manufacturing, CSF stands as a benchmark in automotive cooling solutions. The CSF 06-09 VW Golf / GTI / 99-06 Jetta / GLI High-Performance All-Aluminum Radiator epitomizes this legacy, offering a meticulously engineered component designed to maintain optimal engine temperatures under demanding conditions. Whether for street use or competitive motorsports, this radiator delivers the enhanced cooling capacity essential for high horsepower applications and rigorous racing environments.

At the core of this radiator’s superior performance is CSF’s proprietary B-Tube Technology, a significant advancement over conventional oval “O” shaped tubes. The innovative “B” shaped tubes are precision-formed and seam-brazed, resulting in a structure that is not only stronger but also allows the use of thinner, lighter aluminum. This design increases the heat transfer surface area by approximately 15% compared to traditional tubes, effectively doubling the cooling efficiency within the same spatial constraints. The dual liquid laminar flow enabled by the B-Tubes ensures more uniform coolant distribution, thereby enhancing thermal dissipation and engine protection.

Complementing the B-Tube design are ultra-efficient multi-louvered fins, engineered with a 6.5mm fin height and precisely aligned to maximize airflow through the radiator core. Each fin configuration is rigorously tested in CSF’s wind-tunnel laboratory to achieve optimal heat rejection performance. This meticulous attention to detail ensures that the radiator performs reliably across diverse operating conditions, from daily driving to high-stress track scenarios.

The CSF radiator for MK4 VW models is engineered as a true “drop-in fit” replacement, facilitating straightforward installation without the need for modifications. All brackets are CNC machined and welded to exacting standards, guaranteeing exceptional durability and a secure fit. The inlet and outlet connections are designed to mirror original equipment specifications, allowing seamless compatibility with OEM hoses and aftermarket components alike. This ensures that vehicle owners can maintain the integrity of their cooling system while benefiting from the enhanced performance of a CSF radiator.

Features

• 2-Row 42mm Core (Dual Core) Featuring CSF's Exclusive B-Tube Technology for Superior Cooling Efficiency
• Core Equipped with Ultra-Efficient Multi-Louvered Fins, 6.5mm Fin Height, Optimized for Maximum Surface Area Contact
• CNC Machined "Quick-Connect" Inlet and Outlet Connections for Precision Fit and Easy Installation
• CNC Machined Brackets and Fittings Engineered for Durability and Exact OEM Compatibility
• All-Aluminum Race Style Drain Plug Enhancing Reliability and Maintenance
• Smooth Satin Finish Providing Corrosion Resistance and Aesthetic Appeal
• True "Drop-in Fit" Design Requiring No Modifications, Compatible with OEM Components Including Quick Connect Hoses, AC Condenser, Mounting Brackets, and Fan Shroud

Applications

OEM Part Numbers

• Volkswagen: 1K0 121 251 AB
• Volkswagen: 1K0-121-251-AB
• Volkswagen: 1K0121251AB
• Volkswagen: 1K0 121 251 BK
• Volkswagen: 1K0-121-251-BK
• Volkswagen: 1K0121251BK
• Volkswagen: 1K0 121 251 DM
• Volkswagen: 1K0-121-251-DM
• Volkswagen: 1K0121251DM
• Volkswagen: 1K0 121 251 EH
• Volkswagen: 1K0-121-251-EH
• Volkswagen: 1K0121251EH
• Volkswagen: 1K0 121 251 N
• Volkswagen: 1K0-121-251-N
• Volkswagen: 1K0121251N

Warranty

Unless explicitly stated otherwise, all products sold by R44 Performance Limited are designated RACE ONLY and are solely for competition or off-road use limited to racing formally sanctioned by a recognized racing organization. Any other use, including recreational off-road use, may violate local, state, and Federal laws. R44 Performance Limited does not implicitly or explicitly confirm the legality of using any products it sells on public roads; that is entirely the responsibility of the consumer.

It is the responsibility of the customer to check with all federal, state local and environmental laws before ordering and installing a product. R44 Performance Limited is not responsible for any fees, fines or costs that a customer may incur as a result of failing to check with federal, state, local or environmental laws before ordering and installing a product.

We get a large number of custom orders and requests everyday, so as a result it is not always possible for us to keep every item in stock at all times in our warehouse. If you require the item urgently please contact our sales team here to check the stock before you make your purchase.

We totally understand if you're not certain a part will be compatible with your car, so we highly recommend contacting us here with your query. Our friendly sales team will then be in touch to confirm if this part is the correct part you are looking for.

All in stock products ship the same day if ordered before 2pm GMT

For out of stock items we will contact you with an estimated wait time if not otherwise specified above.

We offer worldwide shipping on all products. If upon receiving your product you wish to return; we offer a 30-day returns policy. For our in-depth returns information please follow the link. "R44 Returns Policy

All of our products come with a standard warranty of 1-3 years. This is dependant on the type of product however. For more details please see our warranty page here.