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All right here’s the update. Sorry for the delay. Follow the entire flow diagram in the maintenance manual. Everything checks out OK. That’s all systems. Fan switch, Cadillac valve, time delay module, continuity in the wiring harness and components, etc. Quick background, my fan comes on...

Got around to checking the rig out today. Started her up cold. Jiggled wires and harnesses. Nothing. Pulled the 2 prong connector to the cadillac valve and the fan spools up. Slows back down when connected. While still cold, I played with the throttle, holding steady at different RPMs. Sure...

Ahh. Good point. I did happen to know the fail safe is full on, so it makes sense that possible a wire my be loose causing the fan to sporadically turn on and off. I'll check it out tonight and see what I can find. Thank you for your input.

Hello everyone. My cooling fan has recently started freaking out. It just randomly comes on and off sporadically for no reason. My Humvee's cooling fan always came on once the temp gauge hit 200 degrees. Now, it will come on and off as soon as I starting driving down the road. Even with...