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It would not be abnormal, so long as the fan does not come on when you switch on from cold. The fan's job is to draw air through the radiator to cool the contained liquid to a suitable working temperature. The fans sensor is activated by the temperature of the coolant. If this is a problem which worries you, try driving as gently and slowly as possible for the last mile or two of your journey. If things are normal the fan should not run on switch-off as that 'trick' will have allowed the coolant to get below the fan-kick-in temperature before you stop the engine. If your vehicle has a temperature gauge use the rteading as an indication.
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