Testing antifreeze/coolant for glycol concentration and inhibitors is an important part of engine management. Because glycol and water are naturally corrosive, coolant manufacturers add inorganic and/ or organic salts and chemicals, known as corrosion inhibitors, to the coolant in order to protect the cooling-system components against rust and corrosion across all the metal surfaces. Over time these inhibitors can become depleted, so testing is required. The correct mixture of coolant with the proper amount and type of inhibitors will guard against corrosion. Recommended testing for levels of glycol is also essential for protecting a heavy duty engine against extreme hot or cold temperatures. If the glycol concentration is too rich or too poor, not only can freezing or boil-over become a problem, but protecting the essential engine components can become a matter of concern.
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