Need Hvac wiring schematic

[blacknight80]

hi guys I'm looking for an hvac wiring schematic and some details on the ac to engine harness connector. What does the red, blue, black wire do. I'm guessing red is switched 12v and black is ground but unsure of the blue wire. I'm trying to use the driver side harness from my 82 regal for a hot air transplant.
The stock connector is the same but has different coloured wires and I am thinking I can repin it to make it work. I have found the schematics from gnttype and vortexbuicks but I'm looking for a little more detail that shows all the wires in the circuit if it exists.

Thanks