Need help trying to fine where does the blue wire goes to

 

To the power steering cutoff switch.

 

that for ac green wire is going in side the firewall but I dont kno wire the blue goes

 

Right: power in that version comes from the control head via the green wire to the low-pressure switch, then to the power steering cutoff switch via the blue wire, then to the control module & compressor relay.

I'd suggest getting another one of that connector at the junkyard, rather than trying to splice to wires that short. The same connector is on MILLIONS of vehicles from that era.

 

I'm in alabama no junk yard has this vehicle in there
so the blue goes to the compressor its self then?

 

You weren't listening. You don't need "this vehicle". ANY GM vehicle from the 80s will have that connector; trucks, full-size, FWD econoboxes, … ALL of em. They ALL used the same low-pressure cutoff switch. (the thing that connector connects to)

You weren't listening. The blue in that connector goes to the power steering cutoff switch.