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...in military driving school, they teach you that when the engine overheats, to immediately stop and shut the engine off...ie: "...turn OFF the FIRE..." that's the quickest way to cool down an engine, short of flooding everything with a hose and water.
...the quickest way to get an engine to warm up is to (ta,dah!) don't let it cool down, ie: use engine block heater, etc. while it's parked.
...also, using a "100%-closed" grille shutter at first also works, but you need to be very careful that it doesn't "stay" closed and also that it doesn't "stick" in some position.
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