Vacuum Line???

Discussion in 'GM Powertrain' started by jnbascom, Dec 14, 2009.

  1. jnbascom

    jnbascom New Member

    I have a vacuum line that I am trying to locate. It goes in the puck looking thing where the PCV valve plugs into. It is a smaller line probably 1/4 inch but it doesn't go anywhere. It has vacuum while the motor is running. Could this line have something to do with the front differential not engaging? The car is a 1999 GMC Jimmy 4X4.

    Thanks in advance for any help with this.
  2. brianj

    brianj Rockstar

    The front diff. locks through vacuum. It sounds like the line for the 4x4 is off - you need to check a manual to see how it is supposed to be routed.

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