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The engine thermo fan on my 2009 Ford Mondeo 2.3-litre tends to run very fast for about 40 seconds when the ignition is turned off. It did it even when car was new. The dealer told me they could not find any fault codes and checked cooling system and said everything fine. But it seems like the radiator is too small for Australian conditions.
It is not unusual for the engine fan to run for a short time after the engine is turned off, although it's more common on engines with turbochargers, and it's done to cool the turbocharger before it's shut down. I don't believe there's anything untoward happening with your car.
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