Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
Do you have power and ground at the fan? Unplug fan connect test light between terminals and see. If I’m not mistaken one wire is hot with key on. Then the other is a switched ground that goes through the resistor
