Antifreeze/Coolant PN: AF1420

Test your heavy duty truck cooling system to avoid freeze-up or boil-over.

  • Easy to use.
  • For anti-freeze/anti-boil protection.
  • Allows visual inspection for rust and sediment.
  • Works with all ethylene glycol coolants.


  • ENSURE engine is cool.
  • TOTALLY IMMERSE pointer.
  • DRAW UP fluid. Fluid should be level with horizontal line at top of tester.
  • TAP to dislodge air bubbles. Pointer shows degree of protection.
  • INSPECT for rust or dirt. Flush and refill system if you find rust or dirt in the sample.
  • FLUSH tester with hot water to clean.


It is important to maintain your antifreeze/coolant at the proper concentration to provide good corrosion protection as well as prevent freeze-ups and boil-overs. This tester provides a quick and easy method to safely collect a sample and measure coolant concentration. It also allows a visual inspection of the antifreeze while you test it. This is a low-cost way to check the condition of the antifreeze/coolant in your HD fleet.