You might have blown the start capacitor on the 2006 front ac..known issue..google it, easy fix but you need to know what you are doing with electricity or you might get zapped..OR...the front AC compressor is toast and the unit has to be replaced or the front fan motor might be burning or burnt out and that can be replaced..is compressor running for front?...or fan turning on? or just fan and no compressor and the compressor tries to start but won't...the behavior of what is happening can give us some more ideas.