The Best Radiator Flushes of 2023

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We ranked and reviewed the top 9 Best Radiator Flushes in 2023. Read more How we ranked

Emily Sloyan
  Mar 30, 2023 5:09 PM
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1
Design Engineering 040206 Heater Hotter Performance Radiator Additive to Accelerate Heat Transfer, 16 oz.
Design Engineering 040206 Heater Hotter Performance Radiator Additive to Accelerate Heat Transfer, 16 oz.
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  • SCORE
    9.4
    KT Score

    KT Score is a ranking system developed by our team of experts. It from 0 to 10 are automatically scored by our advanced technological tool based upon the data collected. Our website is an independent organization and has no relation to the manufacturers, so our reviews are completely objective.

  • Brand
    Design Engineering
Features

Accelerates transfer of heat from engine to heater

Improves engine warm-up time by 50%

Simply add to your radiator

Safe with all types of anti-freeze; contains no glycol

Helps reduce engine wear

PROS
    CONS
      2
      Hy-Per Lube HFL400 Hy-per Cool Radiator Cleaner & Super Flush - 16 oz.
      Hy-Per Lube HFL400 Hy-per Cool Radiator Cleaner & Super Flush - 16 oz.
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      • SCORE
        8.3
        KT Score

        KT Score is a ranking system developed by our team of experts. It from 0 to 10 are automatically scored by our advanced technological tool based upon the data collected. Our website is an independent organization and has no relation to the manufacturers, so our reviews are completely objective.

      • Brand
        Hy-Per Lube
      Features

      Eliminates Damaging Coolant Gels

      Reduces Operating Temperatures

      Neutralizes Acids That Cause Corrosion

      Helps Prevent Formation of Scales / Deposits

      Rislone Hy-per Cool Radiator Cleaner and Super Flush removes coolant gels and neutralizes acids in the cooling system. It cleans the entire cooling system preventing overheating and corrosion

      PROS
        CONS
          3
          Permatex 80030 Heavy Duty Radiator Cleaner, 1 quart
          Permatex 80030 Heavy Duty Radiator Cleaner, 1 quart
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          • SCORE
            7.8
            KT Score

            KT Score is a ranking system developed by our team of experts. It from 0 to 10 are automatically scored by our advanced technological tool based upon the data collected. Our website is an independent organization and has no relation to the manufacturers, so our reviews are completely objective.

          • Brand
            Permatex
          Features

          Removes rust and scale from automotive engines, radiators and water jackets

          Cleans and unclogs stream cleaner coils and broiler tubes

          Not for use in aluminum radiators

          Suggested Applications: Engines, radiators, water jackets, industrial maintenance applications

          PROS
            CONS
              4
              Irontite ThoroFlush (468-9110-16)
              Irontite ThoroFlush (468-9110-16)
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              • SCORE
                9.4
                KT Score

                KT Score is a ranking system developed by our team of experts. It from 0 to 10 are automatically scored by our advanced technological tool based upon the data collected. Our website is an independent organization and has no relation to the manufacturers, so our reviews are completely objective.

              • Brand
                Irontite
              Features

              Industrial Strength concentrated radiator, engine coolant system and fuel tank cleaner

              Loosens and removes rust, scale, grease, oil and sludge

              Cleans Auto, HD Truck and Equipment Cooling Systems

              Safe for use on Cast Iron, Aluminum or Plastic

              PROS
                CONS
                  5
                  BlueDevil 32oz Head Gasket Sealer w/Radiator Flush
                  BlueDevil 32oz Head Gasket Sealer w/Radiator Flush
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                  • SCORE
                    9.3
                    KT Score

                    KT Score is a ranking system developed by our team of experts. It from 0 to 10 are automatically scored by our advanced technological tool based upon the data collected. Our website is an independent organization and has no relation to the manufacturers, so our reviews are completely objective.

                  • Brand
                    N/A
                  Features

                  Permanently Seals Blown Head Gaskets

                  Permanently Seals Leaking Radiators

                  Permanently Seals Warped & Cracked Heads

                  Permanently Seals Leaking Heater Cores

                  Includes 32oz Head Gasket sealer and 32 oz Flush

                  PROS
                    CONS
                      6
                      Prestone AS105 Radiator Flush and Cleaner - 22 oz. - 2 Pack
                      Prestone AS105 Radiator Flush and Cleaner - 22 oz. - 2 Pack
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                      • SCORE
                        9.6
                        KT Score

                        KT Score is a ranking system developed by our team of experts. It from 0 to 10 are automatically scored by our advanced technological tool based upon the data collected. Our website is an independent organization and has no relation to the manufacturers, so our reviews are completely objective.

                      • Brand
                        Prestone
                      Features
                      PROS
                        CONS
                          7
                          BlueDevil Radiator Flush
                          BlueDevil Radiator Flush
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                          • SCORE
                            8.9
                            KT Score

                            KT Score is a ranking system developed by our team of experts. It from 0 to 10 are automatically scored by our advanced technological tool based upon the data collected. Our website is an independent organization and has no relation to the manufacturers, so our reviews are completely objective.

                          • Brand
                            BlueDevil Products
                          Features

                          Extends Vehicle Life

                          Advanced Cleaning Power

                          Concentrated Formula

                          PROS
                            CONS
                              8
                              Prestone AF-KIT Flush 'N Fill Kit
                              Prestone AF-KIT Flush 'N Fill Kit
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                              • SCORE
                                9.8
                                KT Score

                                KT Score is a ranking system developed by our team of experts. It from 0 to 10 are automatically scored by our advanced technological tool based upon the data collected. Our website is an independent organization and has no relation to the manufacturers, so our reviews are completely objective.

                              • Brand
                                Prestone
                              Features

                              Professionally back-flushes cooling systems of most cars and light trucks

                              Allows you to flush the complete cooling system, not just the radiator, in one easy process

                              Removes rust and dirty coolant that that can lead to a clogged radiator

                              Prevents potential overheating and engine damage

                              Easily installs antifreeze/coolant in minutes

                              PROS
                                CONS
                                  9
                                  Liqui Moly Radiator Flush Cleaner (2 Pack)
                                  Liqui Moly Radiator Flush Cleaner (2 Pack)
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                                  • SCORE
                                    9.5
                                    KT Score

                                    KT Score is a ranking system developed by our team of experts. It from 0 to 10 are automatically scored by our advanced technological tool based upon the data collected. Our website is an independent organization and has no relation to the manufacturers, so our reviews are completely objective.

                                  • Brand
                                    Liqui Moly
                                  Features

                                  Flushes and Cleans Radiators

                                  Increase Performance

                                  PROS
                                    CONS

                                      Last update on 2023-03-30 / Prices / Affiliate links / Images, and Product Highlights from Amazon Product Advertising API

                                      Editor's Notes

                                      We ranked and reviewed the top 9 Best Radiator Flushes in 2023. With the support of 33,218 customer's reviews, we hope that this article can give you the most realistic view of these products. The list below contains some main brands as design-engineering, hy-per-lube, permatex, irontite, na, prestone, bluedevil-products, liqui-moly.

                                      4.5
                                      2 ratings