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An alcohol based fluid that is miscible in water and used to remove heat from the engine. Also see the [cooling-system] tag for related components such as the radiator and water-pump.
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How, and why, do you test coolant concentration?
Testing Coolant is pretty easy using specific gravity. A tester has several balls that have slightly different densities. Different balls will float depending on the concentration. … This will allow the coolant to freeze at higher temps but also cools the engine better at very high temps.
In the end, Flush the coolant if your unsure. Testing only tests the reservoir. …