Vacuum source for Comfort control Panel (HVAC)
 

Hello! I'm still working on this problem. Does any one known where the orginal vacuum feed is located on the engine? I have a 1988 E250 5.8l MPI engine. I have located the vacuum tree on the Plentum (sp) but I can't size or reach it! I'm considering tapping the vacuum modulator feed as its near by and 0.25 inches. The "Orange" plastic line on the fire wall side sems to be (0.156) or 5/32. Any thoughts or Comments?
Thanks.:)