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This has been driving me nuts for months now. 93' 5.0 F-150. The coolant keeps leaving and the truck overheats. I have changed t-stat (twice), New cap, new hoses last year, flushed radiator (though it could still be clogged).
Fan belt seems OK,

A friend of mine had a problem like this with his Accra (@ 110K miles no less - "good" cars?). Turned out to be his head gasket. Another indicator is it started to overheat while idling -- cooled down at speed. Nothing from the tail pipe.