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Running Hot, Tried Almost Everything To Keep My Cool 200 1981

Arrgh! I've literally done everything and can't figure out why my temp gauge is running high. I have a pre-1985 water temperature gauge, so the temperature compensation board is not an issue.

Until two weeks ago, my temp gauge pointed to the bottom of the "N." Now it's half-way between the top of the "N" and the red zone, regardless of how and where I drive.

I've changed: coolant (50/50), radiator, thermostat, fan clutch (that was fun).
There are no leaks and I hear pressure when I try to loosen the coolant overflow cap. The water pump is not leaking and does not make any noises. I cleaned the water temperature sender terminal.







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