replacing transfer vacuum switch 1995 blazer
 

2D 4.3L 4wd Does it matter which vacuum line is on which connection on the new vacuum switch. I don't see any markings on the new switch.

im pretty sure it does matter, i plated with my Vac. lines until i got the right order

Year there's two vacuum lines and the 3rd is a vent. If you arejust swapping switches the part that snaps back onto the switch is notched so you can't out it on wrong

mine was located on the firewall, two vac hoses comming from it, not sure what years were like that, a buddy of mine has a 1998 Envoy, just like mine, but the vac switch is not on the firewall, it some place else,