AC WORKING ONLY WHEN KEYSWITCH IS POSITION 2, WHEN CAR IS STARTED NO AC on 1992 Mercedes-Benz 300SL

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 .....

Asked by for the 1992 Mercedes-Benz 300SL
1 answer
sounds like electrical on the run side of the ignition switch