I have an 05 3.0 Sport with NAV and just noticed one HVAC setting isn't working correctly. All the vents function as expected except when I select floor & dash... air only comes out of the dash vent... not floor. I can get air from the floor with all other floor settings. Is this a known problem? I honestly don't know how long this has been happening. But now that temps are below 20F it's obvious.