Air sound vacuum like sound at shutoff

[CJVilla]

2021 Silverado RST about 1,800 miles noticed when I shut off there is a vacuum like air sound. Not sure what it is, I shut off radio and A/C and hear it like a poof sound.

[Anacortes Army Guy]

On 8/29/2021 at 7:57 AM, CJVilla said:

2021 Silverado RST about 1,800 miles noticed when I shut off there is a vacuum like air sound. Not sure what it is, I shut off radio and A/C and hear it like a poof sound.

Approximately 1 minute after shutting down my truck makes a short series of clicking noises and what sounds like a vacuum hose releasing air.  Assuming this is the noise you are referring to, this is apparently normal, at least according to others on this forum who have discussed it before.  When heard for the first time it can be a little unnerving as I've never had a vehicle "talk" to me as much as this truck does.  Kinda like after being shut off for awhile, then opening a door, and then hearing what others say is the fuel pump priming - it takes a little getting use to.

[CJVilla]

Yeah I have heard all that clicking and clacking but the fuel pump priming does that sound like a hiss sounds almost and cuts off, that’s the noise I’m trying to figure out it’s right at shut off and hear it when my door opens right at shut off

[Transient]

Only noise I could think of this being is the parking brake engaging, but that's electric. 

[bjr2020 6.2]

Mine makes same noise when I shut it off. Hard to explain sounds like something in the intake. Curious myself 

[CJVilla]

11 hours ago, bjr2020 6.2 said:

Mine makes same noise when I shut it off. Hard to explain sounds like something in the intake. Curious myself 

Yeah not sure I made a video. Is it the same noise your trying to explain? Check it out 

 

https://youtube.com/shorts/HCrGL-1izcU?feature=share