Combi switch Heating Ventilation Air conditioning

I’m new in the forum, I scrapped a 91 Orion 1.4 and for a few days a Escort 1.6 16V Zetec 90PS year of construction 96 Schrägheck. Machine-wise my “screw” did well and there was a lot to fix, But with the electrics he has “left paws” fact I have to change the ZEB (secure is ok, voltage is also on) but the switch is “played hood” there is no mechanical rest when turning or pressing. except for ATU (32,90 Euro) I have no longer s (even with E-Bay found nothing) How do you change the switch? Is this possible from the inside? I have already felt (through the radio shaft) everything loose. As I said then I also have to get there to measure whether voltage arrives. Question about ZEB If you have the name on the note which is glued on the front with me ( TA 18563 High LHD 12.3.96) or you have to expand the thing (is not funny at the time) Had it already folded down a bit unfortunately not far enough (search nämli er Ersatz über E-Bay) 95 AG or 96AG? Last question at the front right side of the battery so between the battery and the air-conditioning box are the cables to the fan motor? What is this for a black box (painting box size) in front of the air-conditioning box? As I said, I have to get along with the Essi now, not a bad car, others also have your quirks, you just have to stay on the ball.