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.
Avatar
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



AD