I had a similar experience (Aug 2023). Took it to my service place, and they removed the dashboard after putting dye in the system and found the evaporator coil (passenger side not far from cabin air filter) was leaking and they replaced it. I had them check the coil in the back and they said it...
That is 1 annoying sound & I have no clue what that could be! I've owned my EXPY for over 2 years & had a turbo replaced for the waste gate rattle issue. Never heard these 4thGens make that noise. Looking forward to reading what you find out on this.
I posted my update on this in the wrong thread. Here is the resolution of my issues (bottom of page):
https://www.expeditionforum.com/threads/2018-help-cold-start-noise.50702/page-2
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