2000 S10, 4wd ,4.3 motor
When I push the 4wd button on dash the transfer case engages but the the front diff does not engage. I found the vac actuator under the battery tray was not being activated (no vac to actuator). I traced the vac line to where it goes down behind distributer. Not sure where it goes from there. I manually pulled on the cable to the front diff,(and clamped it with a vise grip),and the 4 wheel drive works fine. I have asked people at several parts stores as to where the vac line to the actuator comes from to no avail. All they offer me is a part number for the actuator that is under the battery tray.
Can some enlighten me as to where the vac line to the actuator under the battery tray comes from? I'm not sure if I have a vac leak upstream or maybe another actuator not opening.
Thanks in advance for your help