Hi all.. Just noticed when I went to use the a/c on my '90, that it wasnt coming out the vent. Instead all the functions only come out the defrost. Could this be that tinny little diaphram that has the vacuum line going to it?And has the arm attached to the other side? Just curious as I have a spare from one of my other SHO's and thought I would ask before pulling stuff apart.. thanks Curt