Part #: 3871

CSF 3871 Radiator

⚙️ 13 vehicles fit this part
🔍
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$91.19Free Shipping
🚚Free ShippingNo Cost to Continental U.S.
🔄Free Returns*Wrong fit? No cost
🛡️60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
🔥
✅ 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: Hyundai and Kia, Elantra, Elantra GT, and Forte
🔄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 3871

The CSF radiator 3871 is engineered for reliable cooling performance in Hyundai and Kia vehicles. Designed specifically for models like the Hyundai Elantra, Elantra GT, and Kia Forte, this radiator features a durable aluminum core and plastic tanks to ensure efficient heat dissipation and long-lasting operation.

  • Core thickness: 5/8 inch
  • Core width: 16 inches
  • Core length: 24 1/16 inches
  • Aluminum core material with plastic tanks
  • Cross flow design for optimized coolant flow
  • Inlet and outlet diameter: 1 5/16 inches (left inlet, right outlet)
  • Single-row radiator core
  • Includes a high-efficiency plate type oil cooler measuring 10 13/16 inches

Detailed Product Description

This CSF radiator (part number 3871) is built with an aluminum core that measures 5/8 inch thick, 16 inches wide, and 24 1/16 inches long, providing a robust surface area for effective heat exchange. The plastic tanks are designed in an OEM style to match original equipment specifications, ensuring proper fit and function. The cross flow configuration enhances coolant circulation, improving engine temperature regulation under various driving conditions. Both the inlet and outlet have a diameter of 1 5/16 inches, positioned on the left and right sides respectively, facilitating straightforward hose connections. Additionally, the integrated oil cooler is a high-efficiency plate type, measuring 10 13/16 inches, which helps maintain optimal oil temperatures for engine protection.

Compatible Vehicles and Applications

  • Hyundai Elantra
  • Hyundai Elantra GT
  • Kia Forte

This radiator is designed to replace original equipment radiators in these specific models, addressing common cooling system issues such as overheating, coolant leaks, and reduced cooling efficiency.

Common Issues Addressed by This Radiator

  • Engine overheating due to clogged or damaged radiator cores
  • Coolant leaks from cracked or worn plastic tanks
  • Reduced cooling performance from corrosion or buildup
  • Oil temperature regulation problems addressed by the integrated oil cooler
  • Incompatibility or poor fit of aftermarket radiators causing installation issues

Installation Notes and Tips

When installing the CSF radiator 3871, ensure all hoses match the 1 5/16 inch inlet and outlet diameters for proper sealing. The cross flow design requires correct orientation to maintain coolant flow direction. Verify that the radiator core dimensions (24 1/16 inches length, 16 inches width, and 5/8 inch thickness) fit within the vehicle’s radiator support. Since the radiator does not include a cap, reuse the existing cap or source 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. While specific warranty details are not provided here, CSF products typically come with manufacturer-backed warranties covering defects in materials and workmanship. Consult the product documentation or manufacturer for exact warranty terms.

BrandCSF
Part Number3871
Core Thickness5/8
Core Width16
Core MaterialAluminum
Tank MaterialPlastic
Core Length24 1/16
Inlet Diameter1 5/16 left
Outlet Diameter1 5/16 right
Down Flow Or Cross Flow TypeCross flow
Radiator Core Row Quantity1
Cap IncludedNo
Box Height (in)6 5/8
Box Length (in)33 5/8
Box Weight (lbs)9
Box Width (in)20 3/16
Hazardous MaterialNo
Inlet Length (in)16 5/8
Inlet Width (in)1 3/8
Oil Cooler (in)10 13/16 (high-efficiency plate type)
Outlet Length (in)16 5/8
Outlet Width (in)1 3/8
Tech NoteO.e.m. style plastic tank & aluminum core.

This part fits 13 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2024KiaForte2.0LL4N/AUpgraded Heavy Duty Core. 41% Thicker 15.5mm vs OEM 11mm
2023KiaForte2.0LL4N/AUpgraded Heavy Duty Core. 41% Thicker 15.5mm vs OEM 11mm
2022KiaForte2.0LL4N/AUpgraded Heavy Duty Core. 41% Thicker 15.5mm vs OEM 11mm
2021KiaForte2.0LL4N/AUpgraded Heavy Duty Core. 41% Thicker 15.5mm vs OEM 11mm
2020HyundaiElantra2.0LL4N/AOE style design ensures optimal fitment and performance.
2020HyundaiElantra GT2.0LL4N/AOE style design ensures optimal fitment and performance.
2020KiaForte2.0LL4N/AUpgraded Heavy Duty Core. 41% Thicker 15.5mm vs OEM 11mm
2019HyundaiElantra2.0LL4N/AOE style design ensures optimal fitment and performance.
2019HyundaiElantra GT2.0LL4N/AOE style design ensures optimal fitment and performance.
2019KiaForte2.0LL4N/AUpgraded Heavy Duty Core. 41% Thicker 15.5mm vs OEM 11mm
2018HyundaiElantra2.0LL4N/AOE style design ensures optimal fitment and performance.
2018HyundaiElantra GT2.0LL4N/AOE style design ensures optimal fitment and performance.
2017HyundaiElantra2.0LL4N/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:

1360925310F200025310F2100CU13609HY3010213HY3010215

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