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98 xj overheating out of nowhere???

My fans are working fine. Mechanical one is turning and the electric kicks on when it gets too hot.

Original water pump as far as I know.

This is something I really want to figure out and fix on my own for the experience. I know enough about engines that I SHOULD be able to swap out any part on the engine myself.

I guess I will start with flushing the system and making sure it is filled appropriately. See if that helps, then moving to the thermostat and go from there.
 
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