Have you replaced the thermostat? You said it does fine without it, and you
didn't mention it in the list of things replaced...
Maybe a restriction in the system, perhaps a chunk of the old gasket
restricting the flow of coolant?
I have crankshaft driven fan and it works properly. I've replaced the
thermostat too. Heck if I know what is wrong with the darn thing but
there isn't anything left to replace and it still overheats. *kicking
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