CSF 3916 Radiator
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CSF

CSF 3916 Radiator

Brand CSF 3916
Core Thickness 1 1/4
Core Width 28 11/16
Core Material Aluminum
Tank Material Plastic
Core Length 18 7/8
Inlet Diameter 1 5/16 left
Outlet Diameter 1 5/16 right
Down Flow Or Cross Flow Type Down flow
Radiator Core Row Quantity 1
Cap Included No
Box Height (in) 6 1/4
Box Length (in) 31 5/8
Box Weight (lbs) 13
Box Width (in) 26 5/16
Hazardous Material No
Inlet Length (in) 29 1/2
Inlet Width (in) 1 5/8
Oil Cooler (in) No
Outlet Length (in) 29 1/2
Outlet Width (in) 1 5/8
Tech Note O.e.m. style plastic tank & aluminum core.
Fits Mazda · 8 vehicles

OE-style design. Plastic tank and aluminum core construction matches the original layout.

Wind tunnel tested. Validated for cooling performance in laboratory testing.

Aluminum core. Lightweight construction helps promote efficient heat transfer.

Cross-references BBB Industries 13622, MA3010245 and PY8V-15-200 for the same application. See all 3.

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CSF 3916 Radiator for Mazda CX-9

The CSF 3916 radiator is an OE-style replacement built with an aluminum core and plastic tanks for the Mazda CX-9. It is engineered for direct fitment on 2016-2023 Mazda CX-9 models, including the upgraded heavy-duty core application for 2022-2023 vehicles.

Key Features

  • OE-style plastic tank and aluminum core construction
  • Down-flow radiator design
  • Core thickness: 1 1/4 in.
  • Core width: 28 11/16 in.
  • Core length: 18 7/8 in.
  • Single-row core design
  • Inlet diameter: 1 5/16 in., left side
  • Outlet diameter: 1 5/16 in., right side
  • No radiator cap included
  • No oil cooler integrated

Detailed Description

CSF part number 3916 is a radiator designed for Mazda CX-9 cooling system service and replacement. The aluminum core helps transfer heat efficiently, while the plastic tank design follows an OE-style layout for proper fitment and factory-like hose connection points. CSF states its radiators are engineered to high performance standards and validated through wind tunnel testing, supporting consistent cooling performance across real-world driving conditions. This radiator is listed for 2016-2021 Mazda CX-9 and 2022-2023 Mazda CX-9, with the later application noted as an upgraded heavy-duty core that is 11% thicker than the OEM 27 mm unit.

This part cross-references BBB Industries 13622 for the same application.

What It Helps Address

  • Overheating caused by a worn or restricted radiator
  • Coolant leaks from aging plastic tank and core assemblies
  • Reduced heat rejection from a damaged or inefficient radiator
  • Fitment issues when replacing an OE-style Mazda CX-9 radiator
  • Cooling performance concerns on higher-demand CX-9 applications

Installation Notes and Tips

Verify inlet and outlet orientation before installation: inlet is on the left and outlet is on the right. Confirm radiator dimensions and hose routing against the original unit before removal. Because this radiator does not include a cap and does not have an integrated oil cooler, reuse or replace related components as needed during service. Fits 2016-2021 Mazda CX-9, N/A. Fits 2022-2023 Mazda CX-9, N/A.

Quality Assurance

CSF manufactures radiators to ISO/TSO-certified factory standards and has supplied cooling components worldwide for more than 50 years. The brand reports extensive production volume and laboratory validation of cooling performance for its radiator designs.

Related reading

This part fits 8 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2023MazdaCX-92.5LL4N/AUpgraded Heavy Duty Core. 11% Thicker 30mm vs OEM 27mm
2022MazdaCX-92.5LL4N/AUpgraded Heavy Duty Core. 11% Thicker 30mm vs OEM 27mm
2021MazdaCX-92.5LL4N/AOE style design ensures optimal fitment and performance.
2020MazdaCX-92.5LL4N/AOE style design ensures optimal fitment and performance.
2019MazdaCX-92.5LL4N/AOE style design ensures optimal fitment and performance.
2018MazdaCX-92.5LL4N/AOE style design ensures optimal fitment and performance.
2017MazdaCX-92.5LL4N/AOE style design ensures optimal fitment and performance.
2016MazdaCX-92.5LL4N/AOE style design ensures optimal fitment and performance.
Directly replaces or cross-references 3 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
BBB Industries — 13622MA3010245PY8V-15-200