Ok, so I noticed the ac was vacuum actuated on the 5.0, well first off I was only getting heat and cold through the defrost, fixed the issue with the little hose being unhooked from the AC line on the tree. So what gives? Blend door, or what? I was going to look for a blend door before I found out these were vacuum operated, so what do I need to do? It won’t blow hot or cold on low or medium, only high. Someone have a vacuum hose Diag for the 94 5.0? My chiltons don’t have it.