Dazed and Confused
Join Date: May 2012
Location: Upstate New York
Re: p71 radiator cooling fan
Could be, I'm sending a link of what should be the schematic for your fans. As noted in the schematic (and most of the relays controlled by the PCM, the PCM breaks the ground or neutral, not the hot. So find the neutral to the relay and short it to ground and your fan runs, it's your PCM.
Ever notice that there's so many high performance parts available for GM products?
Did you ever think that maybe they NEED them?