CSF 3780 Radiator
OE Quality 60-Day Returns
CSF

CSF 3780 Radiator

Brand CSF 3780
Core Thickness 5/8
Core Width 17 5/16
Core Material Aluminum
Tank Material Plastic
Core Length 21 5/8
Inlet Diameter 1 1/4 left
Outlet Diameter 1 1/4 right
Down Flow Or Cross Flow Type Cross flow
Radiator Core Row Quantity 1
Cap Included No
Box Height (in) 5 1/2
Box Length (in) 28 1/16
Box Weight (lbs) 7
Box Width (in) 21 9/16
Hazardous Material No
Inlet Length (in) 17 15/16
Inlet Width (in) 1 3/8
Outlet Length (in) 17 15/16
Outlet Width (in) 1 3/8
Tech Note O.e.m. style plastic tanks & aluminum core.
Fits Honda · 10 vehicles

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

Cross-flow layout. Engineered for efficient coolant flow and cooling performance validation.

ISO/TSO certified. Built in certified factories and sold worldwide for decades.

Cross-references OSC 13583, Spectra Premium CU13583 and 19010-5BA-A01 for the same application. See all 4.

$117.28Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
Free return shipping if it doesn't fit when you check fitment here first.
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
Step 2 — Quantity
Order total $117.28
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
Not what you need? See all Radiator options

CSF 3780 Radiator for Honda Civic

The CSF 3780 radiator is an OE-style replacement built with an aluminum core and plastic tanks for the 2016-2020 Honda Civic. It is engineered as a cross-flow radiator with left-side inlet and right-side outlet placement to match the factory cooling layout.

Key Features

  • Fits 2016-2020 Honda Civic, N/A
  • OE-style plastic tanks with aluminum core construction
  • Cross-flow design for factory-style cooling system routing
  • Core thickness: 5/8 in.
  • Core dimensions: 21 5/8 in. length x 17 5/16 in. width
  • Inlet diameter: 1 1/4 in. left; outlet diameter: 1 1/4 in. right
  • Single-row core design
  • Part number: 3780

Detailed Description

CSF 3780 is a direct-fit radiator for the Honda Civic that follows an OEM-style layout for consistent fitment and cooling-system alignment. The aluminum core helps transfer heat efficiently, while the plastic tank design matches the factory-style construction used on many original radiators. CSF manufactures radiators to performance-focused standards and validates cooling performance through laboratory wind-tunnel testing. This part cross-references Spectra Premium CU13583 for the same application.

Common Cooling Issues It Can Address

  • Cracked or leaking radiator tanks
  • Restricted coolant flow from an aging core
  • Overheating caused by reduced heat dissipation
  • Corrosion or wear in the original radiator assembly
  • Cooling-system fitment problems after radiator replacement

Installation Notes and Tips

Verify inlet and outlet orientation before installation: this radiator uses a left inlet and right outlet configuration. Confirm core dimensions and hose connection sizes against the original unit on your Honda Civic before removal. Inspect hoses, clamps, and coolant condition during replacement to help restore proper system performance. The cap is not included.

Quality Assurance

CSF radiators are manufactured in ISO/TSO-certified facilities and built for global OE-style replacement use. The brand has supplied radiators worldwide for decades and applies engineering validation to support consistent cooling performance. Part number 3780 is built to match the listed application and factory-style radiator layout.

Related reading

This part fits 10 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelBody TypeLitersCylindersPositionNotes
2020HondaCivicSedan2.0LL4N/AOE style design ensures optimal fitment and performance.
2020HondaCivicCoupe2.0LL4N/AOE style design ensures optimal fitment and performance.
2019HondaCivicSedan2.0LL4N/AOE style design ensures optimal fitment and performance.
2019HondaCivicCoupe2.0LL4N/AOE style design ensures optimal fitment and performance.
2018HondaCivicCoupe2.0LL4N/AOE style design ensures optimal fitment and performance.
2018HondaCivicSedan2.0LL4N/AOE style design ensures optimal fitment and performance.
2017HondaCivicCoupe2.0LL4N/AOE style design ensures optimal fitment and performance.
2017HondaCivicSedan2.0LL4N/AOE style design ensures optimal fitment and performance.
2016HondaCivicCoupe2.0LL4N/AOE style design ensures optimal fitment and performance.
2016HondaCivicSedan2.0LL4N/AOE style design ensures optimal fitment and performance.
Directly replaces or cross-references 4 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
OSC — 13583Spectra Premium — CU1358319010-5BA-A01HO3010240