My MKC, has a crunching noise , like a rusty shock piston sound,
Only at 40 degrees or below, and only when it is wet roads.
Very loud and almost constant when driving over slightest road imperfections,
Comes fro the rear of car.
Got appoint in March at dealer for maint service, and this problem.
Hope they find it like your rubber bushing.
2018 Reserve, FWD, purchase date 8/3/18
19" Wheels, Tech pack, Climate pack,
Sound THX, Pearl Ivory tricoat, Cappucino with Expresso trim Interior