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CSF 3921 Radiator

Brand	CSF 3921
Core Thickness	1 1/4
Core Width	17
Core Material	Aluminum
Tank Material	Plastic
Core Length	25 9/16
Inlet Diameter	1 1/4 left
Outlet Diameter	1 1/4 right
Down Flow Or Cross Flow Type	Cross flow
Radiator Core Row Quantity	1
Cap Included	No
Box Height (in)	4 1/2
Box Length (in)	32
Box Weight (lbs)	7
Box Width (in)	20 3/16
Hazardous Material	No
Inlet Length (in)	17 11/16
Inlet Width (in)	1 5/8
Oil Cooler (in)	No
Outlet Length (in)	17 11/16
Outlet Width (in)	1 5/8
Tech Note	O.e.m. style plastic tank & aluminum core with quick-connect inl
Fits	Volkswagen · 28 vehicles

OE-style design. Plastic tank and aluminum core with quick-connect inlet and outlet pipes.

Cross-flow radiator. Engineered for efficient coolant flow through a single-row core.

Aluminum core. Lightweight construction with durable plastic tanks.

Cross-references BBB Industries 13423, Genuine 5C0121251K and VW3010171 for the same application. See all 3.

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OE-Style Radiator for Volkswagen Cooling Service

CSF 3921 is an OE-style radiator built with an aluminum core and plastic tanks for direct replacement cooling service. It uses a cross-flow design with quick-connect inlet and outlet pipes, making it a practical choice for Volkswagen Passat, Beetle, and Jetta applications that need a factory-style fit.

With a 1-row aluminum core, 1 1/4-inch inlet and outlet diameters, and OEM-style tank construction, this radiator is built around the original layout used in the vehicle platform. CSF 3921 is a direct-fit cooling component for drivers replacing a leaking, clogged, or damaged radiator on select Volkswagen models.

Key Features

CSF part number 3921
OE-style plastic tank and aluminum core construction
Cross-flow radiator design
1-row core layout
Core dimensions: 25 9/16 in. length, 17 in. width, 1 1/4 in. thickness
Inlet diameter: 1 1/4 in. left
Outlet diameter: 1 1/4 in. right
Quick-connect inlet and outlet pipe design
No radiator cap included

Detailed Description

CSF 3921 is engineered as an OEM-style radiator with a plastic tank and aluminum core construction to match the original cooling system layout. The cross-flow configuration and quick-connect pipe connections support straightforward replacement in vehicles that use this factory-style design. This radiator is listed for 2020-2022 Volkswagen Passat, 2014-2019 Volkswagen Beetle, 2014-2019 Volkswagen Passat, and 2014-2018 Volkswagen Jetta. The part number 3921 is also referenced for interchange purposes with BBB Industries 13423 and Genuine 5C0121251K.

Common Cooling System Issues It Can Address

Coolant leaks from cracked or aging radiator tanks
Restricted coolant flow from internal corrosion or buildup
Overheating caused by a damaged radiator core
Failed factory-style quick-connect pipe connections
Cooling performance loss after impact or road debris damage

Installation Notes and Tips

Verify inlet and outlet orientation before installation; this unit uses a left-side inlet and right-side outlet. Confirm the vehicle’s original radiator uses a cross-flow layout and quick-connect pipe connections before ordering. Because the cap is not included, reuse or replace the existing cap as needed based on the vehicle’s cooling system specification. For fitment, this radiator is listed for 2020-2022 Volkswagen Passat, 2014-2019 Volkswagen Beetle, 2014-2019 Volkswagen Passat, and 2014-2018 Volkswagen Jetta.

Quality Assurance

CSF manufactures cooling components to OE-style specifications, with this radiator built around the original tank-and-core format used in the listed Volkswagen applications. Part number 3921 is intended for direct replacement service in compatible Passat, Beetle, and Jetta cooling systems.

This part fits 28 vehicles

Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

Year	Make	Model	Liters	Cylinders	Fuel Type	Position	Notes
2022	Volkswagen	Passat	2.0L	L4	—	N/A	—
2021	Volkswagen	Passat	2.0L	L4	—	N/A	—
2020	Volkswagen	Passat	2.0L	L4	—	N/A	—
2019	Volkswagen	Beetle	2.0L	L4	GAS	N/A	OE style design ensures optimal fitment and performance.
2019	Volkswagen	Passat	2.0L	L4	GAS	N/A	OE style design ensures optimal fitment and performance.
2018	Volkswagen	Beetle	2.0L	L4	GAS	N/A	OE style design ensures optimal fitment and performance.
2018	Volkswagen	Jetta	2.0L	L4	GAS	N/A	OE style design ensures optimal fitment and performance.
2018	Volkswagen	Jetta	1.8L	L4	—	N/A	OE style design ensures optimal fitment and performance.
2018	Volkswagen	Passat	2.0L	L4	GAS	N/A	OE style design ensures optimal fitment and performance.
2017	Volkswagen	Beetle	2.0L	L4	GAS	N/A	OE style design ensures optimal fitment and performance.
2017	Volkswagen	Jetta	1.8L	L4	—	N/A	OE style design ensures optimal fitment and performance.
2017	Volkswagen	Jetta	2.0L	L4	GAS	N/A	OE style design ensures optimal fitment and performance.
2017	Volkswagen	Passat	1.8L	L4	—	N/A	OE style design ensures optimal fitment and performance.
2016	Volkswagen	Beetle	2.0L	L4	GAS	N/A	OE style design ensures optimal fitment and performance.
2016	Volkswagen	Jetta	1.8L	L4	—	N/A	OE style design ensures optimal fitment and performance.
2016	Volkswagen	Jetta	2.0L	L4	GAS	N/A	OE style design ensures optimal fitment and performance.
2016	Volkswagen	Passat	1.8L	L4	—	N/A	OE style design ensures optimal fitment and performance.
2015	Volkswagen	Beetle	2.0L	L4	GAS	N/A	OE style design ensures optimal fitment and performance.
2015	Volkswagen	Beetle	1.8L	L4	—	N/A	—
2015	Volkswagen	Jetta	2.0L	L4	DIESEL	N/A	OE style design ensures optimal fitment and performance.
2015	Volkswagen	Jetta	2.0L	L4	GAS	N/A	OE style design ensures optimal fitment and performance.
2015	Volkswagen	Jetta	1.8L	L4	—	N/A	OE style design ensures optimal fitment and performance.
2015	Volkswagen	Passat	1.8L	L4	—	N/A	OE style design ensures optimal fitment and performance.
2014	Volkswagen	Beetle	2.0L	L4	GAS	N/A	OE style design ensures optimal fitment and performance.
2014	Volkswagen	Beetle	1.8L	L4	—	N/A	—
2014	Volkswagen	Jetta	2.0L	L4	GAS	N/A	OE style design ensures optimal fitment and performance.
2014	Volkswagen	Jetta	1.8L	L4	—	N/A	OE style design ensures optimal fitment and performance.
2014	Volkswagen	Passat	1.8L	L4	—	N/A	OE style design ensures optimal fitment and performance.
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Directly replaces or cross-references 3 part numbers

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.

BBB Industries — 13423Genuine — 5C0121251KVW3010171