Hvac controls

[shaynehardy]

My 1993 gmc jimmy s15 4.3l 4wd hvac controls stopped working and i have not found any vaccum leaks at all. any ideas what i can do to get the system working again, not entirely ready rip apart the whole dash. just want to be able to use the ac in the truck for summer

 

[shaynehardy]

well for the people have the same issue but dont have an answer, i found the part casuing all my issues, it is the vaccum mode selector on the controls itself, as well as undercharged ac... aka no refrigedrent in system, part # 1571489