There are 4 weep holes in the cowl under the windshield rubber as seen in the first three pictures. they let the water out of the windshield trac. he may have seal them when installing the windshield. I only use sealer on the corners and top of the gasket between the gasket and body , Not on the area by the weep holes.
Then the water is supposed to flow out the drain holes as seen in the forth picture. behind the fenders. There are also drains in the bottoms of the fenders . If they get clogged the fenders rust
Most of the time the drains are clogged shut with debris in the cowl. Then the water flows over the round dams under the cowl on each side. Remember there is no paint under the cowl so cars that sit out in wet weather will rust under there as this car did. to clean these drains the fenders must be removed.
If your car is painted after removing the Fenders and heater and vent box and cleaning the drains. Look for rust holes and seal them with "POR15 putty" . when dry reach up in the holes and coat as much as you can with . "Chassis saver"you should be able to put water in the cowl and it should drain behind the fenders without any coming in the car. That is what the dams are there for.
View attachment 1715850108
View attachment 1715850109
View attachment 1715850110
View attachment 1715850117
View attachment 1715850118
View attachment 1715850119
View attachment 1715850120
View attachment 1715850121
