Hissing sound from left side of 4.0 after shutdown

[Sam Solo]

Anybody have experience with this? It last about 2-3 seconds and sounds like it could be coming from inside the air cleaner tube where it goes into the throttle body. Don't see any evidence of missing vacuum lines from the top left side of the engine either.

 

[Daryl]

Are you running the air conditioner? May be the air conditioner refrigerant pressure equalizing upon shutdown.

 

[MallCrawlOnTons]

Mine does it after shut down when running the ac.

 

[Sam Solo]

No, not running AC but I've read that. Going to run it tomorrow just see what happens. I've also heard it described as a whistling.

 

[Daryl]

Post a video of what your hearing.

 

[Sam Solo]

Post a video of what your hearing.

I don't know why I don't think of the obvious sometimes...
The length of the noise right after I turn the engine off varies by a second or two either way.