Coolant is a fluid which runs through the engine for the purposes of maintaining the correct operating temperature of many components, including the engine, transmission, and in some vehicles, exhaust gas recirculation (EGR) systems and fuel systems. Coolant is also used to create heated air from your climate control system. Coolant is a mixture of water, an agent that prevents freezing (ethylene glycol or propylene glycol), and a small amount of corrosion inhibitor.
Manufacturer-specified and proprietary coolant types are becoming common. Make sure to use the coolant the manufacturer recommends; the wrong coolant can damage your vehicle. Some manufacturers suggest coolant should last the vehicle’s first 100,000 miles, however checking the “specific gravity” of the coolant during regular maintenance visits is a method of verifying coolant strength for prevention of freezing. Other tests can be done to verify the strength of corrosion resistance, which, when low, can be damaging to the cooling system components.
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