Water in the cab

[mmssvv]

Let me share my experience with similar problem.
On my Volvo the windshield is hold in place by a rubber gasket.This rubber originally has two small holes symmetrically located only on the one of the longest(horizontal) sides.
When some morons at Safelite company changed my windshield,they didn't put the right side with those holes on the bottom and I start get some water inside the cab coming out under the dash.
After drilling the new holes on the WRONG installed rubber side the problem was solved.Pay attention
those holes must match the two symmetrical very small canals on the cab body.
That way the water collecting in the rubber will come out instead of overflowing inside.       
Hope this will help somebody.