There are many causes for the high coolant temperature reading. You may want to do some detective work. You can feel the temperature variation of the radiator from top to bottom (with common sense for safety). If there is no flow (blocked radiator, failed thermostat, bad coolant pump, air lock), the bottom will be cold while the top will be hot.

The temp. sensor near the thermostat housing may be suspect too. If the radiator temp does not correlate with over-heating (by feel or more accurate temp. gauge), the sensor is in-accrate.

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Shane83SD