Have a 99 Blazer.. 4.3 6cyl 4 x 4 .. 4 button transfer switch .. Having an issue with the transfer case shifting into modes by itself. I've done a ton of searching on this subject but haven't found anything specific related to what is going on with my truck. When I start it up, the mode switch on the dash will flash in 4x4 auto, 2-wheel drive, 4 x 4 HI, and then 4 x 4 LO .. then it goes back to flashing in 4 x 4 auto and settles there. I can not get it to go into 2-wheel drive unless I disconnect the vacuum switch on the firewall and plug the line that runs over to and under the battery. If I leave it in 4 x 4 auto and drive the truck it will eventually switch down to 4 x 4 LO by itself and I have to stop and disconnect the vacuum line and start over. I am on a fixed income with very little extra money to spend on this so any help would be deeply appreciated by me. The snow is coming and I need this to work properly for the winter. I have replaced the dash 4 position switch and checked the vacuum lines and all seems to be okay. I don't know whether to buy a new transfer case switch or the comp unit in the kick panel. Hoping someone here has had the same issues and figured it out.

 

45 looks and not one attempt to answer .. oh well, guess no one has come across this issue before.

 

Sorry your not getting any responces to your problem,dont feel bad your not alone.The site is getting to big and experiencing growing pains.Its difficult to find the answers your seaking sometimes.Maybe bring it up again and see what happens.