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Once your car is moving more than 10/15 mph, the fan doesn't matter anymore, so scratch that. There should be NO leaks whatsoever. I use a 190 deg thermostat with a 1/8th hole drilled in it for air bleed purposes, and my FE runs between 170 and 180 unless I'm in stop & go traffic. I also use a stock FE water pump and pully which works fine. The higher number thermostat gives the water a little more time in the radiator to cool before going back to the block.
Just get back to basics, and if you have no luck check the head gaskets. Good luck.
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