Forgot to mention, mine is a 2017. I understand about the turbo, but my question is more towards the HVAC whistling as the OP originally stated. Only whistles from mid to high. Nothing on low. I checked if there was an debris where I could, nada...
Sorry if I'm hijacking the thread, but I think...
I just joined the forum and this was going to be my first question. Bought the Expedition in the winter, so the first time turning on the AC this weekend.
It's the same issue as you described, but haven't gone to the dealership yet. Hope someone has some info....
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