Question about 1999 GMC Sierra 3500
There is 1 or 2 vac solenoid on driverside rear of valve cover.
if there is only one then that one connects to the vac pump and wastegate actuator on turbo. if two vac solenoids,then other one goes to EGR valve on intake cover.
Posted on Jul 12, 2008
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Posted on Jan 02, 2017
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