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Q: humming sound on 1999 Infiniti G20

after car is turned off, there is a humming sound that contiues for 15 secs.
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Is this humming sound from the engine compartment? If so it is probably the electric cooling fan on the radiator and this would be normal. If inside the car again I wonder if it could be related to the heating and air conditioning fan that is switching off but you hear it rotate while is switching off.
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