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How can I power the electric cooling fans on/off using a scan tool? Fans work when AC on. All relays checked and I replaced the temp sensor. Fans still won't kick on when engine temp rises. By elimination - only thing left would be the PCM isn't sending a signal to trigger the fans. Problem; My "limited" knowledge of using a OBD scan tool, i.e., it might as well be thermo-pulse detector from NASA cause I'd know about the same on how to use it

Vehicle: 2006 GMC Sierra Denali V8 6.0 Liter

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