Power to ac clutch fuse no power at clutch on 03 leSabre

If your AC system is otherwise operational, it may just need to be charged. The compressor will not come on unless there is sufficient charge/pressure in the system. So, first thing to check is the amount of charge in the system. You can purchase a gauge , similar to a tire gauge, that will give a reading of the system's charge. The gauge hooks up to the low pressure side ,or the larger diameter hose/line, same as where you place the re-charge hose. Again, if the system is operational, as you charge it, the compressor should kick in. At first, it will cycle on and off until the system reaches sufficient pressure.
Hope this helps...