general problems of the 1997 Cadillac Seville

1997 Cadillac rear light housings is a defective design. These housings continually leak causing excessive moisture to be trapped. We had delivery on our sts on 10/09/96. These housing were replaced under warranty on 2/18/97 due to this problem. Again on 3/25/98, these housings were replaced under warranty due to same problem. The moisture problem continued and when presented to dealer on 09/07/01 for service, we were told that this was a normal condition and Cadillac has washed its hands with no replacement. They have implied that this a defective design and can only be fixed by replacement, but at owner's cost. Now, this problem has continually got worse resulting in corrosion in light bulb sockets causing light failure. I am concerned that this moisture will eventually cause a electrical short resulting in a fire, etc. Or visibility concerns for on coming vehicles. Is Cadillac waiting for an accident caused by these conditions before they react????? also reference to odi id#10014105,8008955,8008954.