Mercedes EQV Rear Ventilation Problem

I had similar issues on a 2016 Skoda Octavia. Same symptoms, ventilation all over the place. Have you checked all the fuses?

Fuses, eh? I hadn't considered that. Wouldn't that affect other systems too? Was it only the rear climate acting up in your Skoda, or were you getting weirdness up front as well? Where should I look for these fuses?

Just the rear ventilation was affected. Check the fuse box diagram; there should be one specifically for the rear HVAC. If the fuse is fine, it's likely a wiring fault as you suspect. A workshop visit is probably unavoidable.

You're a legend! It WAS a dodgy connection. The workshop confirmed it. The HVAC repair was easy once they found it. The automatic climate is back, and the rear passengers are comfortable! Thanks for the pointer!