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Tech Tips :: Cross Generation Tech Tips :: Keeping Coolant and Radiator free of corrosion

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While I think that we all pretty much understand the make up/qualities of antifreeze or coolant it is more important than ever to be able to judge the condition of that liquid in our cooling systems. Scale and deposits can eat away at our metal parts especially aluminum. How can we, inexpensively monitor the condition of our coolant I'd always wondered until I saw this neat tip that I thought I'd share. Whether it is Green, Red, blue or some other color you can easily check it without anything more than digital volt-ohmeter. Simply attach the positive lead to the metal part of the radiator(I wedge it carefully into the fins to hold it) and the negative probe into the coolant itself. A voltage reading of .2 volts is considered good and a reading of .5 volts should be considered marginal. If you are above .7 volts your coolant has failed and you should flush and clean your system right away! This works surprising well and is so easy to do. I'm not completely comfortable with some of the 5 year claims about coolant life and am changing the coolant utilizing this method without worry as there is no guesswork. Try it! Streetrod