I am hearing a sloshing sound when I close both doors of my 2014 Mustang. Also when driving I hear it from the rear passenger side quarter panel area. Has anyone else had this issue?

 

Pull the drain plugs on the bottomed of the door. No joke

 

yep, there are drain holes along the bottom of the door; they are covered with little black plastic thingies; apparently they must be clogged . . . remove those and the water should come out

 

No, they're kind of a joke, I mean, look at this situation.

Better'n the Caliber's. (or probably Patriot or Compass Gen 1, as they're virtually the same car...) They just have enlarged weep holes in the panels. Plugged up alla time.

 

There's enough water in there that you can hear it? I'd be opening drains before rust provides holes.