rear window washer leaks at winsheild onto dash
How can the rear window washer leak onto the front windshield and dash ? 
Must be quite a system to get from the rear window to the dash.
Fiat sure is inventive.
Try cleaning the rear window washer
The pump and reservoir are up front so there has to be a way to get the fluid where it’s needed. Some older Acuras ran the supply line up the windshield pillar and along the roof. I suspect the OP’s minivan uses a similar arrangement. There’s a leak in the supply line that needs to be spliced.