While the posters are correct--you can't file a lemon law claim against GM for this car due to its age, there comes a point where you question if your car's value is diminished as a result of this problem and the subsequent repair. You do not mention if you bought this car from a Cadillac dealer or who is fixing the car. If you bought this from a Cadillac dealer and you have a GM warranty, you may be eligible for soem resource udner a Federal law known as the Magnuson Moss Warranty Act. This applies to cars that have a manufacturers warranty and have substantial repairs during the warranty period but outside of the lemon law parameters. Look at the following websites for more info:
www.lemonlaw.com www.lemonlawamerica.com www.nationallemonlawcenter.com
If a firm does help you, there is no cost, because like the lemon law, the mag moss act provides free legal representation.
Safe driving. I hope you get your car back soon.