The 4wd in my 99' GMC Envoy will not work and I just noticed under the hood there are a couple very brittle and missing from the sensor on the firewall vacuum hoses. Does anybody have a vacuum diagram for the 4wd system? I have searched for the past two hours trying to fing it. Help I'm desperate and my envoy is stuck in my driveway from the 9+ inches of snow around it!

edit: found that the main vac is off of the actuator? where is that located?

 

desperately need help they are calling for more snow this tuesday!

and might I add that this "Diamond Edition" Envoy has to be the biggest peice of S**T I've ever owned! Anything that could go wrong with it has, and it's falling apart around me! *except for the motor lol it seems to run very well.