I’ve attached a clip capturing the sound I started hearing from time to time on my 2020 RX 350 f sport with only 14k miles on it.
it’s start right after I turn off the engine and last for about a minute. This is the second time I witnessed the sound.

Anyone know what it’s or know how to fix it please let me know … thanks

https://youtu.be/srWI17jEi4k

 

Wow, that is super weird and super annoying! At only 14K miles, instead of checking on the forums, go straight to the dealership to have them diagnose this for you! Show them this video clip!

 

I know, I always want to hear others experience before going to the dealership. Some dealerships will try to learn on your vehicle without giving you a clear reason for the issue, specially like my case the sound doesn’t come out every time, but I’m definitely going to show them.

 

It’s haunted !!!

ive never heard of anything like this before.

 

I'm the farthest thing from a car guru, and while my car often seems possessed, this sound could be (that's a huge could be) a vacuum leak from the pressure differentials somewhere in your system. It could be a small hole, or a loose connection between hoses, where there is a low vs high pressure differential. These differentials aren't always external vs internal, often it's an internal cold vs hot differential where pressure is applied to a component designed to separate the differences in temperature.

Wish I could help more, but maybe this can trigger some ideas from the many more knowledgeable folks on the forum. One final thought, this seems to be coming from where your heating cooling system is partially located. Could it be due to low AC refrigerant gas, thereby causing pressure on the compressor.

 

This is just a guess...It sounds like audio feedback to me, but how? Bluetooth glitch? I'm very interested to hear the dealer's diagnosis. Ray A.

 

I’m convinced with this explanation, but I’ll let you all know what the dealership will do or say

by the way no electricity was on since I already opened the door, so no way this sound can come from the audio system.

 

You had the climate control system running when you recorded that video?

 

no everything was off (turned off the engine and opened the door -which shut all electricity running off-)

 

I wonder if it's the vents closing up. On my GS once I shutdown the car, it will be a minute or so then the vents closes. I can hear it. It's normal for my car.

 

As expected after I showed the dealer the video they got no idea where this sound may come from, and advised me if it start coming more often to come for inspection.
Up to now I only experienced this sound 3 times.