This one has me clueless. I have 2 vacuum lines that come out of the firewall where the wires for the interior go in. I know one of them go to the intake , this one controls you A/c vents. the other one I,m not sure. The previous owner had a donut leak and it melted the plastic vacuum lines. If anyone has an 89 or equiv.with a 2.8MPFI If they could go take a look on theirs I would greatly appreciate it. They are on the passenger side between the a/c duct and the engine.
Thanx