CSF 3970 Radiator
OE Quality 60-Day Returns
CSF

CSF 3970 Radiator

Brand CSF 3970
Core Thickness 5/8
Core Width 22 5/16
Core Material Aluminum
Tank Material Plastic
Core Length 27 9/16
Inlet Diameter 1 1/2 left
Outlet Diameter 1 1/2 right
Down Flow Or Cross Flow Type Cross flow
Box Height (in) 5 7/8
Box Length (in) 33 5/8
Box Weight (lbs) 10
Box Width (in) 27 1/16
Hazardous Material No
Inlet Length (in) 23 1/16
Inlet Width (in) 1 9/16
No. Of Rows 1
Oil Cooler (in) No
Outlet Length (in) 23 1/16
Outlet Width (in) 1 9/16
Radiator Cap Supplied No
Tech Note O.e.m. style plastic tank & aluminum core. upgraded with higher p
Fits Toyota · 9 vehicles

Cross-flow design. Promotes efficient cooling with left inlet and right outlet flow.

Aluminum core. Lightweight construction helps transfer heat effectively.

Upgraded tube design. Stronger B-tube construction adds durability and cooling performance.

Cross-references Bosch 13842, 16400-F0080 and TO3010375 for the same application. See all 3.

$156.00Free shipping
In stock · usually ships same day before 1pm CST
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Step 2 — Quantity
Order total $156.00
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
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OE-Style Radiator for Toyota Highlander and Grand Highlander

CSF 3970 is a cross flow radiator built with an aluminum core and plastic tanks in an OE-style layout. It is engineered for direct replacement use on select Toyota Highlander and Toyota Grand Highlander applications, with upgraded B-tube construction for improved heat transfer and durability.

Key Features

  • Aluminum core with plastic tank construction
  • Cross flow design with 1-row core
  • Core thickness: 5/8 in.
  • Inlet: 1 1/2 in. left; outlet: 1 1/2 in. right
  • Core dimensions: 27 9/16 in. length x 22 5/16 in. width
  • OE-style replacement with stronger B-tube design
  • CSF part number 3970
  • Cross-references Bosch 13842 for the same application

Detailed Description

CSF 3970 is designed for cooling-system service on 2020-2025 Toyota Highlander and 2024-2026 Toyota Grand Highlander models. The radiator uses an aluminum core paired with plastic tanks, matching the OE-style layout while incorporating a higher-performance B-tube design for improved cooling efficiency. With a 5/8-inch core thickness, cross flow configuration, and 1 1/2-inch inlet and outlet sizing, this radiator is built around the factory-style fitment requirements of these Toyota SUVs. If you are replacing a worn or leaking radiator on a Toyota Highlander or Toyota Grand Highlander, CSF 3970 provides a direct-fit cooling solution backed by CSF’s long-running radiator manufacturing experience.

What This Radiator Helps Address

  • Coolant leaks from a damaged or aging radiator tank or core
  • Overheating caused by restricted or inefficient heat exchange
  • Cooling-system service needs after radiator corrosion or wear
  • Replacement of a factory-style radiator on Toyota Highlander and Grand Highlander models
  • Restoration of stable engine operating temperatures

Installation Notes and Tips

Verify inlet and outlet orientation before installation: this unit uses a left-side inlet and right-side outlet. Confirm radiator dimensions and mounting layout against the original part before removal. Transfer any vehicle-specific components required by the application, and inspect hoses, clamps, and coolant condition during replacement. This part is listed for 2020-2025 Toyota Highlander and 2024-2026 Toyota Grand Highlander applications.

Quality Assurance

CSF manufactures radiators to high-performance standards and validates cooling performance through laboratory wind tunnel testing. The brand states its factories are ISO/TSO certified and that it has supplied radiators worldwide for more than 50 years.

Related reading

This part fits 9 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersFuel TypePositionNotes
2026ToyotaGrand Highlander2.5LL4FULL HYBRID EV-GAS (FHEV)N/AUpgraded with Higher Performance & Stronger B-Tube Design
2025ToyotaGrand Highlander2.5LL4FULL HYBRID EV-GAS (FHEV)N/AUpgraded with Higher Performance & Stronger B-Tube Design
2025ToyotaHighlander2.5LL4FULL HYBRID EV-GAS (FHEV)N/AUpgraded with Higher Performance & Stronger B-Tube Design
2024ToyotaGrand Highlander2.5LL4FULL HYBRID EV-GAS (FHEV)N/AUpgraded with Higher Performance & Stronger B-Tube Design
2024ToyotaHighlander2.5LL4FULL HYBRID EV-GAS (FHEV)N/AUpgraded with Higher Performance & Stronger B-Tube Design
2023ToyotaHighlander2.5LL4FULL HYBRID EV-GAS (FHEV)N/AUpgraded with Higher Performance & Stronger B-Tube Design
2022ToyotaHighlander2.5LL4FULL HYBRID EV-GAS (FHEV)N/AUpgraded with Higher Performance & Stronger B-Tube Design
2021ToyotaHighlander2.5LL4FULL HYBRID EV-GAS (FHEV)N/AUpgraded with Higher Performance & Stronger B-Tube Design
2020ToyotaHighlander2.5LL4FULL HYBRID EV-GAS (FHEV)N/AUpgraded with Higher Performance & Stronger B-Tube Design
Directly replaces or cross-references 3 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Bosch — 1384216400-F0080TO3010375