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There is a vacuum manifold that can easily be used to individually send vacuum to 5 different vacuum actuators. It's a delco part, I've got it shown on my Automatic Climate Control thread in the fusion brain forum. each solenoid is powered by +12v with a common out.
There are servos that will do the job for the heat door, take a look at the box, where the heat door swivels and see if there's room for a servo. The servo's should have potentiometer position feedback, or be stepper motors that can be tracked by pulse counting. You just have to be sure you have room for one.
There's a lot you would be bypassing by controlling the actuators directly and reading the inputs directly. This is most true with automatic HVAC control in mind.
I'm not a Mac guy, so I'm not much help, I know. But I am developing software for PC to do that (slowly, as I'm a beginner), and using the Fusion Brain's very diverse and robust skinning language to allow the same through their software (which will likely be done much sooner).
There is a lot of the mech engineering/process control to be included. I'd say I'm about 60% on it.
Temperature blend door and fan control are much harder than mode control, imho.
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