My air conditioner is not working in the front or the back.

If you have some kind of extended warranty, it depends on the coverage of that warranty. It would be helpful to get to know what it does and does not cover; check your contract information, but also reach out as needed to your warranty company. If it is a General Motors warranty, consult your dealership for guidance. There are so many possible causes and components that could be in question that it's difficult to speculate. A system diagnosis will be necessary to determine what area to focus on to determine the cause of your concern.