Mechanics

WHY WON'T MY 4WD ENGAGE

2000 Chevrolet Silverado • 138,000 miles

My 4wd won't engage. The actuator has been changed. Diagnostics said there was a vacuum problem.
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Mike1943
August 8, 2012.



There are updates for the actuator. Did you get the newest update as they had many issues with those old vacuum units.

Roy