Front Drive Axle Vacuum Actuator Solenoid Valve?

I got on this site looking for a schmetic for a 2000GMC 4X4 Sonoma. My problem was the Air Controls and front axle failed at the same time.I immediately assumed a vacuum failure. Your pictures helped a great deal.I found that the vacuum line was hanging loose at the driver side fender.I plugged it and they are working. According to the pictures posted it should be plugged into the fender. You can see it was attached somewhere. The top threee photos in this post illustrate it greatly. The middle picture depicts the linedirectly under the thumb.I will be darn if I can find the connection.

I found it. Thanks. This post was a great help.

I have this same issue on mine. However today, while diagnosing my vacuum lines I broke the nipple off of the reservoir inside the driver side fender. How do I deal with this. Also is there a way to check the vacuum actuator solenoid that's located on the firewall to diagnose that it is faulty?