CSF 3705 Radiator

OE-Style Cooling Replacement for Passat

The CSF 3705 radiator is an OE-style replacement built with a plastic tank and aluminum core design for the 2012-2018 Volkswagen Passat. It is engineered for direct-fit cooling system service where consistent heat transfer and factory-style packaging matter.

CSF’s 1 Row Plastic Tank Aluminum Core line focuses on practical OE replacement construction, combining a lightweight aluminum core with molded plastic tanks. For Volkswagen Passat radiator replacement needs, CSF 3705 follows the original-style layout to support proper fitment and cooling performance.

Key Features

• Fits 2012-2018 Volkswagen Passat, N/A
• CSF part number 3705
• 1-row cross-flow radiator design
• Aluminum core with plastic tanks
• Core thickness: 7/8 in.
• Core dimensions: 25 11/16 in. length x 15 11/16 in. width
• 1 1/4 in. left inlet and 1 1/4 in. left outlet
• OE-style plastic tank and aluminum core construction

Detailed Description

Built for the 2012-2018 Volkswagen Passat, this radiator uses a cross-flow layout with a single-row aluminum core and plastic end tanks to match the original equipment style. The design supports factory-style hose routing with left-side inlet and outlet placement, and the compact 7/8 in. core thickness helps maintain the intended packaging in the engine bay. CSF 3705 is a direct replacement choice for Passat cooling system repair when the original radiator is leaking, restricted, or damaged.

CSF manufactures a wide range of radiators for many vehicle applications, and this model reflects that OE-focused approach. This part cross-references Bosch 13422 for the same application.

What This Radiator Helps Address

• Coolant leaks from cracked tanks or aged seams
• Restricted coolant flow from internal radiator wear
• Overheating caused by reduced heat dissipation
• Physical damage to the radiator core or end tanks
• Cooling system service on a Volkswagen Passat with OE-style layout

Installation Notes and Tips

Verify inlet and outlet orientation, core dimensions, and hose routing before installation. Inspect related cooling system components such as hoses, clamps, thermostat, and coolant condition during radiator replacement. Confirm the vehicle uses the listed 2012-2018 Volkswagen Passat application and compare the original radiator layout to the CSF 3705 before final assembly.

Quality Assurance

CSF states that its factories are ISO/TSO certified and that its radiators are engineered and wind-tunnel tested for cooling performance validation. The brand also reports more than 50 years of global radiator supply experience and over 30 million units sold.