Interface to factory HVAC controls
If your getting stuck and you really want to be able to control your factory knobs and buttons automatically (retaining your orginal control circuity, by tucking it away) I would be willing to do an interface that could controll it via a PC etc. I just need to know what signals you will need to control it. Serial or USB will be easiest, depending on the resolution of the dial you could have :
16 steps need 4 digital outputs
256 steps need 8 digital outputs
alternatively if you outputs could give x amount out pulses that were done fairly quick this could be done also.
the only thing you would have to send you control unit so i can analyize it, then i would just attach a connector to the side of the unit to be able to access the controls.
hopefully im on the right track with you here. :)