This doesn't happen all the time but when it does, I start the engine and after about 60 seconds a humming starts up and gets louder and louder then maintains. When I shut off the engine in buzzes back down, it sounds like a nuclear reactor starting... I was thinking it might be the engine fan or a bad starter solenoid. I could use some advice...
Here is a link to a video of the noise:
https://www.dropbox.com/s/i140y30tb7mx…