95 is not OBD-II computer so a scanner will not read the sensors unless it's the ford dealer factory unit. Sounds like the low speed fan is out and it is cycling on the high speed fan limit point. try jumpering the los speed fan relay in teh aux fuse box and see if it turns on. Also 95 is subject to a recall for cracking wire harness so the underhood wiring could be the problem with the fan.
