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No diagram. but I had the same problem. The plastic vacuum line was melted near the distributor on the right side ( when you are sitting in the van). Just trace the vacuum lines very carefully, they are plastic and get brittle because it gets very hot under the cowl. I used rubber hose to replace the complete section and tried to cover every line I could reach with aluminum foil ( some insulation is better that nothing). I went for the ventillation problem first and removed the heat/AC control panel. It is very fragile and hard to reinsert, I broke it and had to replace. I had to use a dremmel tool and cut out some of the plastic molding inside the dash to get the 2nd control panel back in. I consider my problem was a major vacuum leak because a line was broke and not just a small crack in the line that can be found by spaying WD-40 or small enough to cause a whistle. If you find any other lines that look damaged you should replace them too. Good luck. igw
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