Vacuum Diagram for '98 F-150
 

Was hoping that someone had a diagram of the vacuum system for the '98.

the heater door control portion looks something like this.. general idea.

look at the bottom post drawing-

https://www.ford-trucks.com/forums/9...-please-2.html

I just posted the 98's vacuum schematic in this thread: https://www.ford-trucks.com/forums/9...rost-only.html

The one in the thread above is for the 03 which is pretty darned close.