Good morning gents, I'm getting a whistling/clogged sound when running in non recirculation mode. In previous cars it was an easy fix. However I've noticed the 2015 doesn't have a cabin filter and cannot locate the outside air intake. Any help finding the path to remove the clog?
I bought a new 2015 Expedition Limited 4x4. During one service visit, the Ford dealer said there was a computer update for the HVAC controller, and it was performed.
After the update - when I use the a/c on high, including the rear a/c on any speed, I now get a whistling sound from the system. If I switch to recirculation mode, the sound goes away. If I get the whistling sound, it will also go away if I slightly open the rear, tilt-out windows.
I was irritated the dealer performed an update, which only caused a problem. On return visits, the advisor said they could not “undo” the update - and there were no additional updates.
I removed the LR taillight assembly to ensure the vent flap fitting was not clogged, and it wasn’t.
I’m stumped.