1990 corsica has a water leak above the brake pedal during a heavy rain storm. Have removed drivers side wiper and plastic cover to check for crack inside windshield box; could not find or see a crack. How or where can water be coming from to find path to path?
Water is a tricky problem sometimes. If your A/C drain is plugged water can't drain from you air plenum you were looking into, so check the drain located below the heater motor and make certain no debris has blocked it.
Next, if the windshield sealer has deteriorated it can cause a leak. ( you haven't had the windshield replaced lately?).
The brake vacuum booster has a weather proof seal between the booster and the firewall, it may have deteriorated.
Anything that goes through the front of the dash should be suspect.
A good way to check is to use a garden hose and place it in particular spots and check inside for leaks. That way, you can narrow down the area that is leaking.
Good luck, let me know.
Regards,
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