Re: Vacuum Diagrams (alldatadiy.com)
I joined alldatadiy for about an hour. Long enough to see that they don't have the diagram I want. I will say to their credit they gave me a prompt refund (or said they did).
This is my SPECIFIC problem; there is a vacuum-servo valve that cuts OFF the coolant flow to the rear heater core. I can't find what ACTUATES that valve.
I think its been bypassed and removed in my van, there is a brass "elbow" linking two vacuum lines together up behind the heat/ac control module. One vacuum line (small colored plastic) goes to the cutoff valve, the other (thicker black rubber) goes back into the engine compartment and then to nowhere.
I can't figure where is was originally supposed to go, and I can't figure what the "missing" part is, and how it was actuated from the controller.
I've closed the valve with a zip-tie which allows the AC core to cool the rear air (the heater always won) which I will clip in cold weather. However, I might fix this thing if I could figure it out.
Plus my cruise doesn't work in a halfarsed way (will keep a low speed, but not a high speed, like it can't get enough vacuum to pull the cable hard enough), which I suspect is a vacuum leak, not a totally broken thing. Maybe this hose goes in the missing port, or something.
Any clues are welcomed.
'89 E250 XLT Sportwagon 7.3 IDI, E40D, 4.11