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2018 Sienna Noise After Shut Off

656 Views 7 Replies 4 Participants Last post by  goldenpiggy, 
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I have a 18’ Sienna that just started making a noise when I shut the vehicle off. The closest thing i can describe it to is like someone tried to pass gas quietly but it ended up being louder than expected. Once its off, it almost sounds like air is being released from a hose or valve. Its hard to tell if its coming from under the air intake (in the back) or if its coming from the front. Can anyone help identify this problem?
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2018 XLE
If the A/C has been on, it may be the system equalizing pressure when it's first turned off. I have not heard that on ours, but we are usually making noise opening doors and grabbing stuff after shut off.
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