Recently I had my heat set to the "floor setting" while driving down a dirt road. When I tried to slide the adjustor back to "vent" a few days later it would only go about 1/2 way and then it seemed to get hung up on something. It slides over to the "defrost" setting fine, and all the other various "climate adjustors" work as they should. No matter how much I mess with it, the slider will not go back to the "vent" setting. I think something may have become dislodged, but I have no idea where to even begin looking. Has anyone had this happen to them before? and was it a simple fix??