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Q:

humming sound on 1999 Infiniti G20

Enthusiast 01be16a5a93688912f14755221fb15211b518d9a788cf01b455e03cc1bd585ac
after car is turned off, there is a humming sound that contiues for 15 secs.
(4) Answers
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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.
Fuel cap - pressure equalization. Normal.
There is a humming sound that continues constantly after it is shut off
If sound is from rear of car it could be the antenna retracting or attempting to retract