I've got an 86 K20 that I'd like to add air conditioning to. I've got two parts cabs (87 R10 & 83 C10) , both with AC from factory. Other than the actual heater box and the vents, what all needs swapped? Where do I tap the wiring into? What all is recommended I replace off the bat? I'm really not sure if either cab has all the wiring. But both seem to have most of the parts on the firewall.
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