not exactly correct... On single cam cars, the auxilary electric fan is activated by a thermostatic switch in the lower radiator hose. On dual cam cars, the aux electric fan is triggered by the ECU based on the AC system. I don't think the ECU can operate the fan based on temp. If it did, it could be exploited to control larger electric fans, and several reputable ECU hackers/tuners say that it cannot be done. Both cars do have two coolant temp sensors next to the thermostat housing. One operates the cluster gauge, and the other informs the ECU so that it can do cold idle and overheat retarding. The stock auxilary fan does not move very much air anyways.