I know the obvious but nothing is wrong with my system when I jump it turns compressor on and nice cool air comes out. I have had three mechanics look it over and still no solution. I've a full charge, replace high pressure switch 8 months ago?, tried a different switch panel, all relays and fuses are good, today I replaced the Evap temp sensor and still no a/c. I am in need of knowing what else it may be.. I'm very hot and need to cool off over all this..