[kaede]

Behind the wheels as in the rear left fender liners? Take the liner off and see if there is crap blocking?

Vapor barrier in the doors = gotta rip the door panels off i suppose (sorry, not a hands on interior person, only do basic maintenance and always too worried about doing anything more than just the oil changes, coolants, brake bleeding etc haha). Thanks and will perhaps bring to my mechanic and have them take a look!