Part #: 3937

CSF 3937 Radiator

⚙️ 11 vehicles fit this part
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Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
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✅ In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: Ram, 2500 and 3500
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST

Overview of CSF Radiator Part Number 3937

The CSF radiator 3937 is designed specifically for Ram 2500 and 3500 models, providing reliable cooling performance. Featuring a durable aluminum core and plastic tanks, this radiator supports efficient heat dissipation for heavy-duty applications.

  • Core thickness: 1 5/8 inches
  • Core width: 20 5/16 inches
  • Core length: 39 3/8 inches
  • Aluminum core material with plastic tanks
  • Cross flow design with 2 core rows
  • Inlet and outlet diameter: 1 15/16 inches (left inlet, right outlet)
  • Compatible with Ram 2500 and 3500 models
  • OEM style plastic tank and aluminum core construction

Detailed Product Description

This CSF radiator (part number 3937) is engineered to meet the cooling demands of Ram 2500 and 3500 trucks. The radiator features a 1 5/8 inch thick aluminum core that measures 20 5/16 inches wide and 39 3/8 inches long, providing ample surface area for heat exchange. The cross flow design with two core rows enhances coolant flow and heat dissipation efficiency. Both the inlet and outlet have a diameter of 1 15/16 inches, positioned on the left and right sides respectively, ensuring proper fitment and connection to the vehicle's cooling system. The plastic tanks are designed to OEM specifications, offering a balance of durability and weight savings.

Applications and Problem Solving

  • Replaces damaged or leaking radiators on Ram 2500 and 3500 trucks
  • Addresses overheating issues caused by inefficient cooling
  • Restores proper coolant flow with cross flow core design
  • Prevents engine damage due to coolant loss or radiator failure
  • Supports heavy-duty engine cooling requirements in demanding conditions

Installation Notes and Tips

When installing the CSF radiator 3937, ensure all hose connections match the 1 15/16 inch inlet and outlet diameters. Verify the radiator core dimensions fit within the engine bay space, especially the 39 3/8 inch length and 20 5/16 inch width. Since the radiator does not include a cap, reuse the existing cap or purchase a compatible replacement. Properly bleed the cooling system after installation to avoid air pockets and ensure optimal performance.

Quality Assurance and Warranty

CSF radiators are manufactured to meet OEM standards, using high-quality aluminum cores and plastic tanks for durability and corrosion resistance. This radiator is free of hazardous materials and designed for long service life. Warranty details should be confirmed with the distributor or manufacturer, as they may vary by region.

BrandCSF
Part Number3937
Core Thickness1 5/8
Core Width20 5/16
Core MaterialAluminum
Tank MaterialPlastic
Core Length39 3/8
Inlet Diameter1 15/16 left
Outlet Diameter1 15/16 right
Down Flow Or Cross Flow TypeCross flow
Radiator Core Row Quantity2
Cap IncludedNo
Box Height (in)8 1/4
Box Length (in)47 3/8
Box Weight (lbs)24
Box Width (in)24 1/8
Hazardous MaterialNo
Inlet Length (in)20 7/8
Inlet Width (in)2 3/16
Oil Cooler (in)No
Outlet Length (in)20 7/8
Outlet Width (in)2 3/16
Tech NoteO.e.m. style plastic tank & aluminum core.

This part fits 11 vehicles. Search below:

YearMakeModelLitersCylindersFuel TypePositionNotes
2025Ram25006.7LL6DIESELN/AUpgraded Heavy Duty 16% Stronger Core
2025Ram35006.7LL6DIESELN/AUpgraded Heavy Duty 16% Stronger Core
2024Ram35006.7LL6DIESELN/AUpgraded Heavy Duty 16% Stronger Core
2023Ram35006.7LL6DIESELN/AUpgraded Heavy Duty 16% Stronger Core
2022Ram35006.7LL6DIESELN/AUpgraded Heavy Duty 16% Stronger Core
2021Ram25006.7LL6DIESELN/AOE style design ensures optimal fitment and performance.
2021Ram35006.7LL6DIESELN/AOE style design ensures optimal fitment and performance.
2020Ram25006.7LL6DIESELN/AOE style design ensures optimal fitment and performance.
2020Ram35006.7LL6DIESELN/AOE style design ensures optimal fitment and performance.
2019Ram25006.7LL6DIESELN/AOE style design ensures optimal fitment and performance.
2019Ram35006.7LL6DIESELN/AOE style design ensures optimal fitment and performance.

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

This part directly replaces or is cross-referenced with the following part numbers:

1387168322491AA68322492AACH3010390

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