Description
The CSF High-Performance All-Aluminum Radiator for the MK3 Ford Focus RS is engineered to eliminate overheating under aggressive street driving, track use, and high-boost applications. Designed in collaboration with EcoBoost specialists, this radiator solves a known issue among Focus RS owners: rising coolant temperatures that limit performance during spirited or extended driving.
The factory Ford radiator uses a plastic tank and single-row aluminum core, which is adequate for normal driving but quickly becomes a weak link on tuned or performance-built 2.3L EcoBoost engines. The CSF upgrade delivers a dramatic cooling improvement using a 42mm two-row core, increased fluid capacity, and motorsport-level heat dissipation.
Built with CSF’s exclusive B-Tube Technology, this system increases heat transfer efficiency by approximately 15% over standard welded oval tubes. Combined with high-density multi-louvered fins, this radiator is engineered to keep coolant temps stable in the toughest conditions.
The triple-pass flow configuration pushes coolant through the core three times before exiting, maximizing contact time with the cooling surface. This results in lower outlet temperatures, consistent engine performance, and extended engine life. Fully TIG-welded from aerospace-grade aluminum, it is built to last and installs as a direct plug-and-play replacement with no modifications required.
Key Features
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2-row 42mm ultra-high-performance aluminum core
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Triple-pass flow design for maximum cooling performance
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CSF B-Tube Technology improves heat transfer efficiency
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6.5mm multi-louvered cooling fins increase airflow and surface contact
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100% TIG-welded all-aluminum construction
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CNC machined mounting points and brackets
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OEM-style inlet and outlet
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Direct bolt-in factory fitment
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Increased coolant capacity for better heat control
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Individually leak and pressure tested
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Ideal for street, track, and high-boost builds
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2-year limited warranty
Vehicle Fitment (Unchanged)
Year Range | Make | Chassis Code | Model | Trim | Engine / Trans / Etc
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2016–2018 | Ford | MK3 | Focus | RS | Turbocharged 2.3L L4
Take control of engine temperatures and unlock reliable power—this is the ultimate radiator upgrade for any Focus RS build.
