AC WORKING ONLY WHEN KEYSWITCH IS POSITION 2, WHEN CAR IS STARTED NO AC

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THE AC SYSTEM IS FULLY CHARGED HEAD PRESSURE IS FINE, CHECKED THE AC CLUTCH BY MANUALLY TRIGERRING CAN HEAR IT PUUL IN, THE AC CLIMATE SYSTEM SEEMS TO BE FINE IN POSITION 2 WITH KEYSWITCH, BUT WHEN KEY IS TURNED TO START AC STOPS AN DOESN'T WORK .....