CSF 3725 Radiator - Front

Overview of CSF Radiator Part 3725 for BMW Models

The CSF radiator part number 3725 is designed specifically for select BMW vehicles, including the 320i, 328i, 335i, 428i, and 435i models. Engineered with an aluminum core and plastic tanks, this radiator offers reliable cooling performance tailored to these BMW applications.

• Core thickness: 1 1/4 inches
• Core width: 13 5/8 inches
• Core length: 23 5/8 inches
• Aluminum core material with plastic tanks
• Cross flow design for efficient heat dissipation
• Inlet and outlet diameters: 1 1/2 inches (left inlet, right outlet)
• Single-row radiator core
• Quick-connect inlet for ease of installation
• Cap not included

Detailed Product Description

This CSF radiator (part number 3725) features a cross flow design that enhances coolant circulation and heat exchange efficiency. The aluminum core provides durability and effective thermal conductivity, while the OE-style plastic tanks reduce weight without compromising strength. The radiator’s core dimensions—1 1/4 inch thickness, 13 5/8 inch width, and 23 5/8 inch length—are optimized for the cooling requirements of BMW 320i, 328i, 335i, 428i, and 435i models. The inlet and outlet ports, each measuring 1 1/2 inches in diameter and positioned on the left and right respectively, support proper coolant flow and compatibility with factory hoses. This radiator is designed as a direct replacement, maintaining OEM specifications for fit and function.

Common Applications and Issues Addressed

• Overheating due to radiator core damage or clogging
• Coolant leaks from cracked or worn plastic tanks
• Reduced cooling efficiency from corrosion or buildup
• Replacement of failed or leaking OEM radiators in BMW 320i, 328i, 335i, 428i, and 435i
• Restoring proper engine temperature regulation for optimal performance

Installation Notes and Tips

• Ensure compatibility with your specific BMW model and engine variant before installation
• Use proper coolant and follow manufacturer torque specifications for hose clamps
• Inspect and replace any worn hoses or clamps during installation
• Bleed the cooling system thoroughly to remove air pockets after installation
• Check for leaks and proper coolant flow before completing the installation

Quality Assurance and Warranty

CSF radiators are manufactured to meet OEM standards, using high-quality aluminum cores and durable plastic tanks. Part number 3725 does not include a radiator cap and is designed for direct fitment on compatible BMW models. While specific warranty details may vary, CSF products typically come with a limited warranty covering defects in materials and workmanship. Consult product documentation or the manufacturer for exact warranty terms.