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Funny buzzing noise from under hood

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Has anybody noticed a funny buzzing noise after shut down? I have a 2012 Eco MT. Sometimes after I get in the garage and shut it off, there is a quite audible buzzing noise coming from under the hood. I thought it was an electronic buzz at first but now I am not sure. It sounds like it might be coming from the front of the motor, near the exhaust manifold. There appears to be some sort of vacuum solenoid or something just outside the heat shield, maybe coming from there. I have not noticed any type of performance issues, it is just an annoying sound.
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Fan sometimes runs after shut down
 

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Has anybody noticed a funny buzzing noise after shut down? I have a 2012 Eco MT. Sometimes after I get in the garage and shut it off, there is a quite audible buzzing noise coming from under the hood. I thought it was an electronic buzz at first but now I am not sure. It sounds like it might be coming from the front of the motor, near the exhaust manifold. There appears to be some sort of vacuum solenoid or something just outside the heat shield, maybe coming from there. I have not noticed any type of performance issues, it is just an annoying sound.
Sounds like a Cooling fan.. Open the hood and look at the fan and see if it's running ...
 

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After 5 minutes or so mine'll run a little motor. I always assumed it was the shutters closing to keep in engine heat.
 
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