I have an 86 mustang LX 2.3 L and it seems to be over heating.. mostly when idling at a stop light or for a long trip. I have noticed that the electric fan is not kicking on as the engine heats up, however turning on the AC manually kicks the fan on the the overheating stops. Now I know there is a ECT sensor or something controlling the fans turning on withthe heat. and Im aware it prob needs replacing but i cant seem to find anything on where the damn thing is located or what it even looks like... any help?