There are two puddles in the front.  One on each side in the front, near to the side wall.  
I guess, there is something wrong with the windshield seal.  But I'm not sure.
And it's not the antenna hole, it's sealed already.  

I think, it must be something commonly known to some Vanagon guru, except me.  
Who would know this?

Thank you all,
Zoltan