Ac won’t turn on after 411 swap

[nauju]

I just got done doing the 411 swap on my 98 gmc sierra, everything works good except that my ac won’t turn on anymore after I did the swap, it worked before, what can it be

 

[96greenmachine]

From the directions of the swap on my 96, it says "you need to ground C2-55 for the A/C to work" That should answer your question

 

[nauju]

Thank you sir that was indeed the issue