I do have the complete Climate Control Wiring Diagram for my model, but I don't have a good schematic on where each of the components actually resides (I only have one of the two CDs - so while I may see on the wiring diagram part B10/4 actually LOCATING that part is challenging). Does the outside temp sensor feed both the CCU and the dashboard display, or are those seperate sensors? If they are the same, then the outside sensor is feeding reasonably accurate data (within a few degrees). It is my hunch that the inside sensor is also reading correctly, as the blower fan speed does varry appropriately in other operating modes.

__________________
Lifetime owner
1977 240D

"new" owner
1988 300TE