Any chance this is the "famous" FORD noise called MOOSING - Sounds a bit like a MOOSE ?
Caused by a resonant vibration / oscillation in the pipes in and around the Air filter and air intake etc.
I know Explorers do it, as do the V6 Mondeos with Duratec engines.
Try a Google of Ford Moosing for more info.
Modifying one of the pipes can stop it happening by changing the air intakes system resonant frequency to something outside of the normal operating range that causes it.
Hope this helps
More then likely it's going to be your a/c compr clutch hub bearing, Napa auto parts stock's this item part # 5106WCC. The growling sound is the hub bearing, where your serpentine belt ride's on.
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