I recently bought G20 van with a 305 engine. I have done a major tune-up and found most of the vacuum lines were disintegrating. While replacing some lines, the plastic connectors broke and finally replaced. However due to the sheer number of vacuum lines I'm having difficulty putting them all back correctly. Next time i will label everything. Is there a diagram or a shop manual image that would help me out?
Could the HVAC issue of not working could be attributed to the vacuum lines in the engine? Thanks.

 

Try here: | Repair Guides | Vacuum Diagrams | Vacuum Diagrams | AutoZone.com

Fig. Fig. 133: 1986 5.0L engine-Federal with automatic transmission (G10 and 20 models)