2003 Ford Explorer back door latch will not open

Mine just did the exact same thing. The latch may be moving freely because it is not hooked to the latching mechanism anymore. In my case, the handle had broken where the handle hooks to the rod that operates the mechanism. Go to the Ford dealer and buy a new handle. Here in S.C. it was $24. You can't get this at the parts houses. Start by removing the plastic "Ford" cover that is over the liscense plate lights. You then have to remove the aluminum rivets that hold the handle to the tailgate from the outside and remove the broken latch. Remove the pull handle loop on the interior side of the tailgate (2 screws), unsnap the inside plastic tailgate interior panel, and pull down the black plastic sheeting that is underneath the panel to make access to the mechanism inside of the tailgate. There is also a hard plastic cover that you will see that needs to be pulled loose to open another access hole. Install the new tailgate latch handle by sliding back into the mounting holes and attach with two 10-32 screws and nuts. The new handle will come with a new yellow rod attachment piece on the handle. You will see inside of the tailgate a small rod hanging down, most likeky it will have the same rod attachment piece as the one on the new handle. Note the position of the yellow piece on the rod, as you will connect the new piece in the same place. Once the rod is hooked up, relubricate the metal mechanism with a light machine oil, replace the black plastic cover, replace the black plastic sheeting, (secure with a small amount of duct tape), replace the tailgate interior panel, replace the pull handle loop, shut tailgate, replace "Ford" cover over lights, and you're done!