I can rant off some possibilities for you if it helps...
-- wrong rotation pump
-- clogged radiator and/or water jackets
-- fan clutch is inoperative
-- thermostat isn't opening far enough or is in bass ackwards
-- inoperative radiator cap
That's all I can think of right now. Hope this helps. Good luck!
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Capri306, Moderator, The Mustang Works Online
1979 Mercury Capri, 5.0L -- C4 -- 2.73
1987 Mustang LX Notch 