While on the topic of the fan clutch, how does the clutch work on low speed. Given the belt driven pulley operates at a single speed, I would assume the clutch has some sort of friction clutch that doesn't fully engage. If so, it sure would make me think it must generate a lot of heat. Along that same thought, that heat may be the leading contributor to early clutch failure. If I'm headed down the right path, those that keep their dash air will probably have a longer clutch life given on most dash air applications, the fan is signaled to stay in high speed as long as the dash air is on. Does that make any sense?