CSF
1 Row Plastic Tank Aluminum Core

CSF 3698 Radiator

Brand CSF 3698
Box Height (in) 5 7/8
Box Length (in) 34
Box Weight (lbs) 15
Box Width (in) 29 5/8
Cap Included No
Core Length 22 5/8
Core Material Aluminum
Core Thickness 7/8
Core Width 25 5/8
Csf Cap Number 4514
Down Flow Or Cross Flow Type Down Flow
Hazardous Material No
Inlet Diameter 1 5/16 Right
Inlet Length (in) 26 7/16
Inlet Width (in) 1 5/8
Oil Cooler (in) 9 13/16 (high-efficiency Plate Type)
Outlet Diameter 1 5/16 Left
Outlet Length (in) 26 7/16
Outlet Width (in) 1 5/8
Radiator Core Row Quantity 1
Tank Material Plastic
Tech Note O.E.M. style Plastic tanks & Aluminum core.
Product line 1 Row Plastic Tank Aluminum Core
Fits Toyota · 14 vehicles

OE-style construction. Plastic tanks and an aluminum core match the original design.

Wind-tunnel tested. Engineered to validate cooling performance in the lab.

Down-flow design. Built for efficient coolant flow through the radiator.

Cross-references Carlson 13251, Spectra Premium CU13251 and 16400 31711 for the same application. See all 8.

$195.88Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
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Step 2 — Quantity
Order total $195.88
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.

OE-Style Radiator for Toyota 4Runner

This CSF radiator is built for 2010-2023 Toyota 4Runner applications with an OE-style plastic tank and aluminum core design. It is engineered for direct replacement fitment and consistent cooling performance in daily driving and demanding conditions.

Key Features

  • 1-row radiator design with plastic tanks and aluminum core
  • Down-flow configuration for the listed Toyota 4Runner applications
  • Core thickness: 7/8 in.
  • Core size: 25 5/8 in. wide x 22 5/8 in. long
  • Inlet diameter: 1 5/16 in. right; outlet diameter: 1 5/16 in. left
  • High-efficiency plate-type oil cooler section: 9 13/16 in.
  • OE-style plastic tank and aluminum core construction
  • CSF Part Number 3698

Product Details

CSF 3698 is part of the brand’s 1 Row Plastic Tank Aluminum Core line, a product line focused on OE-style radiator construction with aluminum heat exchange and molded plastic end tanks. CSF manufactures a wide range of radiator applications and validates cooling performance through laboratory wind-tunnel testing. For Toyota 4Runner owners, this radiator provides the correct down-flow layout and connection sizing for the listed model years.

This part cross-references Spectra Premium CU13251 and Carlson 13251 for the same application. It is a direct-fit radiator for Toyota 4Runner cooling system service where the original radiator has aged, leaked, or lost efficiency.

What This Radiator Helps Address

  • Coolant leaks from cracked or weakened radiator tanks
  • Overheating caused by reduced heat transfer efficiency
  • Temperature fluctuation from a restricted or deteriorated radiator core
  • Cooling system service needs on high-mileage Toyota 4Runner models
  • Replacement of a damaged OE-style radiator assembly

Installation Notes and Fitment

Fits 2021-2023 Toyota 4Runner, N/A. Fits 2010-2020 Toyota 4Runner, N/A; OE style design; use Micro, 16 psi cap; 1 row plastic tank aluminum core. Confirm inlet and outlet orientation before installation: inlet is on the right and outlet is on the left. The radiator is designed for the listed Toyota 4Runner applications and should be matched to the vehicle’s cooling system configuration before installation.

Quality Assurance

CSF radiators are manufactured to high-performance standards and produced by an ISO/TSO-certified factory network. The brand states that its radiator designs are engineered and wind-tunnel tested for cooling performance validation. Part Number 3698 is built to support dependable OE-style replacement service for Toyota 4Runner cooling system maintenance.

This part fits 14 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersPositionNotes
2023Toyota4Runner4.0LV6N/A1 Row Plastic Tank Aluminum Core
2022Toyota4Runner4.0LV6N/A1 Row Plastic Tank Aluminum Core
2021Toyota4Runner4.0LV6N/A1 Row Plastic Tank Aluminum Core
2020Toyota4Runner4.0LV6N/AOE Style Design; Use Micro, 16 psi Cap; 1 Row Plastic Tank Aluminum Core
2019Toyota4Runner4.0LV6N/AOE Style Design; Use Micro, 16 psi Cap; 1 Row Plastic Tank Aluminum Core
2018Toyota4Runner4.0LV6N/AOE Style Design; Use Micro, 16 psi Cap; 1 Row Plastic Tank Aluminum Core
2017Toyota4Runner4.0LV6N/AOE Style Design; Use Micro, 16 psi Cap; 1 Row Plastic Tank Aluminum Core
2016Toyota4Runner4.0LV6N/AOE Style Design; Use Micro, 16 psi Cap; 1 Row Plastic Tank Aluminum Core
2015Toyota4Runner4.0LV6N/AOE Style Design; Use Micro, 16 psi Cap; 1 Row Plastic Tank Aluminum Core
2014Toyota4Runner4.0LV6N/AOE Style Design; Use Micro, 16 psi Cap; 1 Row Plastic Tank Aluminum Core
2013Toyota4Runner4.0LV6N/AOE Style Design; Use Micro, 16 psi Cap; 1 Row Plastic Tank Aluminum Core
2012Toyota4Runner4.0LV6N/AOE Style Design; Use Micro, 16 psi Cap; 1 Row Plastic Tank Aluminum Core
2011Toyota4Runner4.0LV6N/AOE Style Design; Use Micro, 16 psi Cap; 1 Row Plastic Tank Aluminum Core
2010Toyota4Runner4.0LV6N/AOE Style Design; Use Micro, 16 psi Cap; 1 Row Plastic Tank Aluminum Core
Directly replaces or cross-references 8 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Carlson — 13251Spectra Premium — CU1325116400 3171116400-3171016400-3171216400-3171316410-AZ030TO3010329