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Does your vehicle have climate control now?
If it does as single zone, then it may just be a setup on your part.
Or a reprogram to enable dual zone control.
If it doesn't have climate control, then it would be a large expensive job to remove all of the dash replace the HVAC assembly, and then program to vehicle.
Some would class this as an extreme amount of effort for little gain.
Hope this helps.
I would suggest contact your dealer about navigation.
I have gone down this path with a few cars.
Some of which cannot be changed because the other modules in the car will clash as a mismatch.
Your radio could have an auxilary jack within the console.
Does it have "Aux" as an input source choice?