CSF 3757 OE Replacement Radiator for Hyundai Sonata Kia Optima

The CSF 3757 is a high-performance OE replacement radiator designed for 2011-2015 Hyundai Sonata and Kia Optima vehicles. This direct-fit radiator features an upgraded heavy-duty core that is 19% thicker than the original equipment (22mm vs OEM 19mm), providing enhanced cooling capacity and improved thermal performance.

Key Features:

• Aluminum and plastic construction matching OE specifications
• Crossflow radiator design with integrated transmission cooler
• Inlet location: Upper passenger side
• Enhanced 22mm thick core (vs OEM 19mm) for superior cooling efficiency
• Direct drop-in fit replacement requiring no modifications
• Manufactured in ISO/TS certified facilities
• Rigorously tested: leak tested, vibration-cycle tested, thermal-cycle tested, and wind tunnel tested
• Burst pressure and impulse-cycle tested for durability
• Salt spray tested for corrosion protection

CSF is known as "The Cooling Experts" with over 50 years of experience and more than 30 million cooling products sold worldwide. Every CSF radiator undergoes comprehensive quality testing to ensure reliable performance and long service life. This radiator replaces OEM part numbers 25310-3Q600, 25310-3S750, and cross-references with Spectra Premium CU13189, APDI 8013189, and DENSO 221-9255.