Hello,
Typically, you will get hissing noise form a leaking tire. If the tire were to leak from the inner wall, it can appear that the noise is coming from the engine area. Check the tire on that side and make sure it has proper pressure.
A vacuum leak can also make that type of noise, but it should not exist 10 minutes after engine shut off.
Here is a guide of typical engine noises, go thru this and see if any of them appear to be the issue:
https://www.2carpros.com/articles/engine-noises
Please let me know of any questions.
Thank you.
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Sunday, September 26th, 2021 AT 1:57 PM