Strange noise

Link to YouTube vid of sound.

https://youtu.be/f3b8G_uxjnY

I have a 2010 5.4. Just hit 60000 miles. My wife drove it to work and parked, but on the way inside she noticed the noise. I have no clue. Never heard it before and hasn't made it since. Her best description was the "truck is on a ventilator."

Any ideas?

I hope the link works let me if not.

Thanks for the help.

Fixed your link for ya.



Sounds like vacuum lines. Does your 4x4 work?

Haven't tried 4x4 yet. It happened this morning and i would think that also except in video the truck is completely off keys in hand.
Also thanks for fixing the link.

a vacuum leak would engage 4wd though. if you can pinpoint where its coming from then we can probably figure it out. i think i would check to see if 4wd stays engaged or if it comes on and off

Figured it out....water from Ac dripping on exhaust. The parking lot at her work slants forward a good bit, I guess that's why it only happens there. Man do I feel like a newb.

Thanks again guys.

yeah happened to me mine drips like a crazy