Learning Coolant Fundamentals
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In general, coolants degrade over time as the ethylene glycol breaks down into primarily glycolic and formic acids. Degradation occurs more quickly in engines operating at higher temperatures or those that allow more air into cooling systems. The coolant should be tested on an annual basis if it is intended to operate the system for several years between coolant changes, and particularly where the coolant is used in severe applications.
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I imagine that coolant boiling will mean that elevated temperatures exist right at the point where film boiling of the coolant occurs.