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I have a 08 f150 screw 4x4. Im having problems with the actuators not disengaging in 2wd. Ive gone through the lines and everything looks good. I replaced the check valves and solenoid. If i bypass the solenoid, old and new, i get vacuum to the hubs to disengage the actuators but with the solenoid hooked up there is no vacuum. Any suggestions on what i can check or do? Thanks in advance.
