Edges are not welded Need help

HI guys
i find today a pretty big Problem
90% of the edges in my car mod the dodge challenger are not welded anymore
but in an older Version is all fine i dont understand this
ill used automerging edges but it dont works

Anyone an idea how i can fix this???

 

That's because you applied the Edge-Split modifier

 

Nope sry thats not sovling the Problem

 

He means that at some point in the past you applied your edge-split, which caused all the edges marked as sharp to be split.
Select all of the geometry in edit mode (A) and open the specials menu (W) then choose "Remove Doubles" to get everything back together semi-properly.
Not sure how your model is made, but you may have some work ahead sorting out certain mesh areas that were placed together with remove doubles.

 

WOW great it worked thank you