[Unspec]

For those who already have automatic climate control, you don't need to get the front side vents replaced (64229166889/64229166890 in post #4)****. Also, in my search for parts, salvage yards almost always sell the distribution housing upper and lower as a single unit, which will include all the motors and temp sensors you need for the front distribution housing. Look for parts ideally from a RR, since 4 zone climate is standard on those cars and you don't need to worry about salvage yards misidentifying the parts.

The hardest part on this retrofit isn't really the wiring itself, newTIS wiring diagrams are genuinely easy to follow, but rather sourcing the right plugs and pins. I am planning on tackling this retrofit soon and managed to find a guy in Poland who was selling a wiring kit for 4 zone climate retrofit specifically, and will post pictures of the various plugs and pins once I get the harness.

Edit:

****: Turns out, realoem lies. I removed my front side grilles and they have no accommodations for wiring. Looks like you will need to buy part # 64229166889/64229166890 after all

Edit 2: But on newtis, it appears that the front side vents having any wiring is a 7 series specific thing?? Honestly I dunno at this point. Maybe M_Bimmer can shed some light.

Edit 3: Digging more on newtis, it appears that the wiring on the 4 zone climate specific side vents is just so the knob can...light up? That seems hilariously useless.