This would be pretty easy to design and code. You would need the following:
Interior air temp sensor
Engine temp sensor
Econ switch (tells the system if you want AC or not)
PCM blower motor controller
PCM for mono valve
Digital temp selector
It actually interesting, I bought an ACC retrofit for the Golf. I wonder how well it could be adapted to the Benz's.
On a side note, if you wanted to make something fun, come up with a VGT controller to retrofit modern turbo's on the early cars!
