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Q: overheating shutting down on 1994 Ford Mustang

in two weeks mustang gauge showing rapid change in overheating then cooling down on its own. I've changed thermostat and heat regulator. car runs fine over 50 miles but then I exit in a town and engine shuts down overheating, yet temp gauge only shows half that its overheating, after cool down car runs fine again. I've yet to flush out cooling systom as my next step.
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Check the operation of your cooling fan, it may not be working properly, that may be why it runs cooler on the freeway. Also check for any service engine soon codes, you may have a defective coolant temperature sensor or gauge sensing unit.

here are some shops if you need some help:
the temperaure sensor I've replaced but not the gauge sensing unit. thanks for the help and will post of my outcome.
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