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Message: <blockquote data-quote="CC&#039;S95GT" data-source="post: 775233" data-attributes="member: 10547">when you pull codes (engine off) one of the first things you will hear is the low speed fan for a couple of seconds followed by the hi speed fan for a couple of seconds.This is a good way to test the circuitry. But it doesn't test the temp sending unit.If the low or hi doesn't work , first thing to ck would be the motor itself. I ran a wire straight from the batt to the motor .Neg wire would to the center pin on the motor connector. and the pos wire would go the either side of the center pin (hi speed and low speed) do not try to pwr both hi and low at the same time or you will definately HAVE to buy a new motor.If the motor is good then look at the ccrm for pwr in and out for the fan controls. Wiring diagrams can be found in your HAYNES/CHILTON manuals.</blockquote>