Hi there,

My father has been struggling to fix up an 89 Chevy Blazer. The only problem he is having is he cannot find (this is what he said word for word) a vacuum diagram for the interior manifold. Everything he has found shows the diagrams to the engine, but not a diagram for what's underneath the dash. Basically the engine runs but we cannot get heat, a/c, defrost etc. Even a picture of a working one might help. We have tried Chevy, auto shops and even spoke to someone who worked on the assembly line, but are out of ideas. I have Googled my brains out. Any suggestions are welcome.

Many thanks, Jacie