Frame And Members problems of the 1997 Lincoln Town Car

The water leak is coming in from the windshield wiper motor assembly. I have talked with other 1997 Lincoln towncar owners and they all have the same problem. The water enters the car under the windshield wiper motor and runs down the firewall underneth the carpet and forms a pool of water underneth the carpet in the rear passenger compartment. The dealer tries to sell you an undercoating and does not guaratnee this will fix the problem.