I’m in need of some help I just picked up a 1983 500sl and the AC is not working. It will randomly turn on but then it shuts off after a few minutes. I tried high low all of the different buttons and temp settings. Now I can’t get it to turn on at all when I push the top/ bottom button (second from left) I can hear something clicking on behind the glove box, I get the same thing with the button for bottom vents. When I push the fan button, high or low I don’t hear anything and no air comes out. I’m not sure where to start anyone have any suggestions?