This is what we did at the Dealer Years Ago (before I retired).
Get the water hose out and have somebody go inside the car and start looking/feeling for the water/wetness to start comming in while you move the hose slowly from area to area. In your case I suggest starting around the cowl first and then slowly move the hose around.This may take a little time so
try to do it when it is not hot outside or the person inside will overheat & quit!
Good Luck !
