Nissan Pathfinder

Hi. I had my car overheat, and 2 shops told me it was the fanclutch. I replaced it and still doing it. I replaced the termostat, it still doing it. I had a cooling system service, it still overheats. I also replaced the serpentine belt and A/C belt. I dont think it's the waterpump, because there are no leaks and I have to go 50-60 miles an hour and come to a red light in order for the thing to overheat. I got a 2001 Nissan Pathfinder, 3.5 V-6, 107.000 miles Any ideas?
August 4, 2007.

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