Finally got it figured out! After nearly 3 months of fighting with the Chevy dealer, after about eight times of 50 mile round trips to pick up my broken car that was "fixed" the service manager finally agreed to check the car over with me present. I showed him the low speed fans did NOT work and high speed is all that would work. He confirmed for the first time that the PCM was not the problem and that he was sorry for being a "dick" to me. I showed him a service bulletin that said BCM was at fault for intermittent fan failure. They kept the car one more week replaced the BCM and fans are now fully functional and operate as they should. Best part is he saw us pull up and brought the keys out to me and again apologized for being an "ass hole" ( my wife and children were present) and that he backs his mechanics and they have never seen a BCM cause these issues. The bill for the BCM....NO CHARGE! he shook my hand and said he hoped that I'd still consider them in the future for repair work. If I can figure out how to attach the information on the BCM bulletin I will add them to this post.