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A 'coolant recovery system' is, in effect, an expansion tank, or an over-flow area for an engine's coolant (sometimes called anti-freeze) as the engine warms. When you start your engine, it becomes warmer due to the combustion process of the gasoline it burns, and the friction caused by moving parts. This heat is transferred to the cooling system of the vehicle, and it's radiator. As the engine's coolant warms, it expands within the radiator, causing pressure. At a certain pressure (usually arounds 15 psi) the cap on the fill-hole of the radiator allows the expanding coolant to flow into a plastic 'overflow tank'; a part of the coolant-recovery system. When you shut your car off, and the engine cools, a vacuum is created by the decrease in temperature, which sucks the coolant from the plastic 'over-flow' tank, back into the radiator. This is the 'recovery' process. Most vehicles from the mid 1970's, possibly even earlier, have had some form of a coolant recovery system.

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