Radiator, CSF Triple-Pass Aluminum - F22 M235i/M235iR, F30 335i, F32 435i

Extra-thick core and Triple-Pass means three times the cooling exposure

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BimmerWorld View - Unique three-pass design and extra thick core maximizes cooling. Developed and proven in World Challenge competition. CSF builds an industry leading, high-quality, all aluminum drop-in* radiator that exceeds OE standards, gets rid of the plastic end tanks, and improves cooling.

We trust CSF quality and performance in our street and track cars to provide proper cooling with an easy direct-fit* install. This aluminum radiator for the M235i, 335i M Sport, 435i M Sport, and M2 is a factory replacement using all factory shrouding, clip-on hoses, and mounting points. This racing radiator is designed to fit with the A/C condenser removed. With the condenser removed all other parts are a direct fit, including OEM hoses, mounting brackets, and fan shroud.

CSF uses new technology packed into a compact two-row design for better cooling capacity without the added weight. More efficient B-tubes have greater surface area for cooling (15% cooling capacity increase in fin technology alone) and a precision multi-louvered fin to increase heat rejection performance and surface area contact. Additionally, this CSF part has more total cooling tubes, and a three-pass flow design for maximum cooling in race environments and extreme driving conditions.

These technical features all contribute to improved cooling efficiency over OE-type performance upgrades, as well as other standard "performance" aluminum tanked radiators which are nothing more than aluminum tanks on a traditional stock core.

Read more about B-Tube technology (PDF)

Made in Indonesia in the same factory that produces CSF parts for aftermarket and car line production for several European cars. This part is a much higher level of quality than the typical Chinese factory parts. CSF's Racing & High Performance Division is able to produce a premium high performance cooling system with a level of quality and craftsmanship that is usually found in products with a much higher price point due to their economies of scale of over 600,000 units sold globally every year.

INSTALLATION NOTE: The extra thickness of this radiator requires the factory A/C condenser to be removed. Any radiator replacement can result in air pockets during initial installation/filling which will not allow the system to function properly. Special care must be taken to fully bleed all air in radiator, engine, and cooling system before operation.

All CSF radiators come with a two year warranty against defects in craftsmanship.

This performance radiator replaces Original BMW part numbers 17118672103 and 17117606017.

Fitment note: F30 3-series and F32 4-series models must be equipped with the optional M Sport package.

BMW Fitments:
2 Series
F22 / F23 (2014-2021) > M235i
F22 / F23 (2014-2021) > M235i xDrive
F22 / F23 (2014-2021) > M235i-Racing
F22 / F23 (2014-2021) > M240i-Racing
2 Series
F87 (2016-2021) > M2 N55 (2016-2018)
3 Series
F30 / F31 / F34 (2012-2019) > 335i
F30 / F31 / F34 (2012-2019) > 335i xDrive
4 Series
F32 / F33 / F36 (14-20) > 435i
F32 / F33 / F36 (14-20) > 435i xDrive
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