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I have heard it too, if I'm not mistaken, it's the car's coolant pump recirculating heated coolant from the reservoir into the radiator in preparation for when you start the car to minimize ICE warm-up times. I hear it all the time whenever I unlock the car and open the door, so I'd have to assume it's that since the car assumes you're gonna start the car shortly after unlocking it and opening the door.
 
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