(Almost) new a/c install square body 1990 suburban

Weekend project to get the A/C running in my 1990 square body Suburban. Not a “how to” more of a “how I did it”. Should help with what to look for if you are trying to do the same. Had a little help from my friend, thanks Mike.

[@smallfried6]

I have a 91 and I’m having an issue getting the A/C to blow out the dash vents, it’s stuck on floor only. There isn’t any vacuum at the switch on the dash

[@candykid5135]

for the rear ac i need a new evaporator core, if you know where i can get one ?