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It’s normal.
The coolant pump is designed to operate after car shut off to prevent oil coking in the turbos.
These engines run exceedingly hot and are prone to oil coking if a very hot engine is immediately shutoff. In fact it’s recommended to let the car cool down sometimes after spirited driving by letting it idle for a few minutes before turning off the ignition. It allows the oil to dump heat.
The fans running after engine shutoff attempts to achieve the same thing, albeit it’s not as effective.
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