Before you spend any more money on the Jeep, get you an infared heat gun and check the engine's actual temp. Just aim it at a few points on the engine while its running hot. You might find that it's not as hot as the gauge says.
These things can be helpful for other things, too.

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“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell

It's not over when you lose. It's over when you quit.