Well, you really need a FSM to run diagnostics. I am not sure if a computer will help or not. It may, but I am not up on that stuff. I seem to recall someone once posting the diagnosis. You might find it with a search. When mine failed, I ran the tests and everything checked out ok and sort of pointed to the programmer ($$$). I had my doubts as the voltage controling the fan speed is something like .4 -.9 volts and I was not sure I was getting the proper readings. Electronics is not my strong point. I went with my gut and ordered a new blower from gmpartsdirect. I plugged it in before I installed it and sure enough, it spun right up. As I said, they are known to fail and have been redesigned so my money is on the blower.Lotusman said:Ranger:
I was afraid of that. What diagnostics can I do to confirm it is the blower motor? I work part time at J & A Automotive in Villa Park, IL. Our mechanic has a computer...will this help? Thanks for the reply.