Hey guys I'm Alex now my 98 blazer 4x4 has stoped working so has my heat control from hot to cold is their any relations to this my heat still kind works and some times changes from up front to down low heat. My main question is my t case In gauges and the drive shaft will spinning but when I jack up my truck my wheels are not spinning too could this be as simple as the cable not working I just found that on another form any one of a diagram of any other hoses I can check ?

 

Both the HVAC system and the 4wd system use engine manifold vacuum to control various functions. Chances are good that you have a vacuum leak that is causing problems with both systems. Vacuum diagrams can be found in at least one of the 4wd related Tech Article (DIY) posts. Check my signature below for a link to the Tech Article (DIY) Index.