Is there a Ford Vaccum TroubleShooting Guide 1990 still around somewhere?

[lexxxel]

I've been having some vacuum issues with my truck this year, and they're getting worse. Started with the fan not blowing heat/AC very fast, then it progressed to only blowing out of the defog, no matter what setting it was on.
I fixed that with wire around the switch the vacuum was supposed to control. Now it's on vent in the summer, and defog the rest of the time (like now) when you need to defog your windshield

But now, I've found the A/C compressor comes on all the time when I turn on the heat/AC system (instead of it just being "off"). I thought I had a leak the other day when there was a pool of liquid under the truck... but it was water off the AC compressor. Cold day too, but I guess with the engine being hot...

There is definately a vacuum leak (or leaks) somewhere behind the dash

Anyway... I know there was a vacuum troubleshooting guide back in the day... does anyone know where I could find it now in some form or other? I assume it's the same for all 88-91 F250's (diesel). Checked ebay, all I found was a '96

[cdnsarguy]

Do the vacuum pump test on my gallery....... there are 2 parts you may have to search for both. Select 90 pics per page.

[lexxxel]

thanks. It's definately in the accessories lines... and it's somewhere behind the dash... what I want is a diagram of where the lines run.

For some reason I can't even find my chilton's or I'd look to see if it's in there