Cool-Flo ~ Radiator Conditioner



Castle® Cool Flo™ prevents scale, scum, and corrosion build-up that can clog the cooling system and eat away at the solder and other system components. It has been given a government specification number, signifying that Cool Flo™ has been tested effectively in all types of vehicles. The special surfactant in Cool Flo™ prevents cavitation by eliminating air bubbles in cooling systems of diesel engines. It is compatible with all coolant types, including Dex-Cool™ .


  • Cars
  • Buses
  • Trucks
  • Any enclosed cooling system


1. 12 ounces treats up to 22 quarts. With the engine running, pour the required amount into the radiator.


  • 12oz (#C1212) 24/case
  • 5 gal (#C1212-5) 1 Each


Keep from freezing.


  • Color – blue
  • Specific Gravity – 1.01
  • Flash Point – N/A
  • Cleaning – N/A
  • Effect on Paint – none
  • Odor – slight
  • pH – 11
  • Freeze Stable – yes

Product #:

C1212, C1212-5

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U.S. Customers
Castle AutoChem Products Ltd services Canadian customers only.

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or call 1-800-876-0222.