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  See more parts for Honda Civic
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CSF Radiators CSF OEM Plastic Radiator for Honda Civic 2016-2021, 1.5L Turbo & Si - 3781
CSF Radiators CSF OEM Plastic Radiator for Honda Civic 2016-2021, 1.5L Turbo & Si - 3781 - Image 2 CSF Radiators CSF OEM Plastic Radiator for Honda Civic 2016-2021, 1.5L Turbo & Si - 3781 - Image 2

If you’re looking to keep your ride cool, you can’t go wrong with a CSF radiator. I’ve been around the block with different radiators, and CSF really stands out. They’ve got a massive lineup—over 3,200 applications covering everything from Acura to Volkswagen. So, no matter what you’re driving, there’s a good chance they’ve got something that fits.

What I love about CSF is that they stick to the same materials and style as the original equipment (OE). Whether your old radiator is Copper-Brass, Plastic-Copper-Brass, Plastic-Aluminum, or All Aluminum, CSF has got you covered. These guys have been in the game for over 50 years and have sold more than 30 million units worldwide, so you know they mean business.

Now, let’s talk about the nitty-gritty. These radiators are built to high-performance standards. They’re engineered and even wind tunnel tested to ensure they deliver solid cooling performance. The OEM specified Plastic Tank-Aluminum Core construction means you’re getting durability without sacrificing efficiency. The tanks are made from virgin-grade engineered plastic resins that are “glass filled” for added strength. Trust me, that’s not just marketing fluff. It makes a difference when you’re pushing your engine hard.

One thing I really appreciate is the attention to detail in the design. The gaskets are made from special grade EPDM rubber, which can handle extreme temperatures—up to -120 degrees Fahrenheit. And the fins? They’re designed with a high-performance multi-louvered setup that really helps with heat dissipation. Plus, every radiator is leak tested before it leaves the factory at 150% of the operating pressure, so you know you’re getting a reliable product.

Here are some quick specs for the radiator if you’re curious:

  • Type: Crossflow
  • Rows: 1
  • Core Length: 26 9/16"
  • Core Width: 17 11/16"
  • Core Thickness: 1 1/4"
  • Core Material: Aluminum
  • Tank Material: Plastic
  • Inlet Location: Upper Driver Side
  • Outlet Location: Lower Passenger Side
  • Inlet Diameter: 1 1/4"
  • Outlet Diameter: 1 1/4"

For fitment, this radiator is perfect for the Honda Civic models from 2016 to 2021, including the Civic Si from 2019 to 2020. Just a friendly reminder: when you’re swapping out your radiator, take a minute to check the old radiator pressure cap for any wear and tear. It’s a small but important detail that can save you headaches down the road.

Other Part Numbers:
CSF Radiators #csf3781

Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Vehicle
2016-2021
 Honda Civic
CSF Radiator

Anyone who needs a new radiator should consider buying a CSF radiator. A CSF radiator and CSF cooling system offers the best performance for driving and racing enthusiasts. If you have a faulty radiator or are looking to upgrade to a high-performance radiator, a CSF radiator will get the job done. 

What is a CSF Radiator?

During the last 40 years, CSF has manufactured over 10,000 different models of radiators, oil coolers, heat exchangers and condensers for Automotive, Truck, Industrial and Marine applications. Today, their products are sold in over 60 countries throughout the world. Their US Aftermarket Division stocks over 1000 models that cover over 2100 applications for all popular Import vehicles.

CSF supplies radiators and condensers that are designed to meet or exceed original equipment (OE) engineering specifications. Their plants meet ISO 9000 standards and provide parts to OE manufacturers, and to top it all off - check out their industry leading warranty. Simply put, you cannot buy, sell, install or own a better value radiator or condenser.

Why Should I Buy a CSF Radiator? 

A CSF radiator offers a number of benefits over the competition. Below, we explain the main reasons why you should buy a CSF radiator.

A Market Leader for over 45 Years

CSF has been a market leader for over 45 years, as the company was initially established in 1975 and have been selling CSF radiators ever since. Over time, a CSF radiator has become known for its innovative design and impeccable quality.

High-Quality Radiator Testing

Every single CSF radiator and CSF cooling system has been put through a rigorous series of tests to make sure every system is reliable and performs at a high level. In their testing lab, CSF puts in the time to make sure every product works perfectly. 

Cutting-Edge Technology

Each CSF radiator uses cutting-edge technology to bring customers the best CSF full cooling system possible. CSF racing radiators combine a high-efficiency core, advanced endtank designs, and innovative design and engineering to give our customers the most advanced and efficient radiator possible.  

Get a CSF Radiator or CSF Cooling System From Vivid Racing 

Vivid Racing carries a wide selection of CSF radiator products, including CSF cooling systems and other accessories. If you are interested in learning more or would like to purchase a CSF radiator, please contact Vivid Racing today by calling (480) 966-3040.

CSF takes pride in the quality of its products and offers one of the best warranty’s in the industry. Please refer to the CSF warranty card in the shipping carton for details.

CSF warranty is applicable only to the original owner of the vehicle. Original paper work verifying the proof of purchase and pre-installation cooling system checklist signed by the professional installer is required to process warranty claims.

All warranty claims should be directed to the point of purchase. Due to CSF’s established agreements with Authorized CSF Warehouse Distributors, CSF is unable to handle and/or process warranty related calls/inquires from any individuals – all inquires/warranty related claims should be directed to the point of purchase or an authorized warehouse distributor.

Take care of your radiator, as under circumstances listed below the warranty will be void.

If the radiator is installed and is returned deformed (bulging tanks, warped core etc.), this is an indication that the radiator is the victim of some other problem and not the cause. The deformation is a result of the radiator being subjected to extremely high pressure and or temperature caused by any of the following reasons:Defective Pressure Cap, Defective Head Gasket, Defective Temperature gauge (incorrect readings), Defective Water Pump etc. Such units are not covered under the warranty.

If a radiator seems to have a “fit problem” there is the possibility that there is some confusion about a multi-fit radiator that might look different. Your nearest CSF WD can clarify the application, just give them a call. A perceived fit problem is not covered under warranty.

If a unit is damaged in shipping, please file a claim with the carrier. Damages caused during shipping, installation or handling are not covered under warranty.

Any repairs or alterations to the unit will automatically void the warranty.

Any form of abuse, including the use of improper coolant mixtures, damage caused by steam, corrosion etc and use on commercial vehicles voids the warranty. It is the vehicle owners’ responsibility to maintain the cooling system as specified in the owners manual.

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