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The thermostat does not read or send a siginal to the gauge ,I opens and closes. The thermostat may need changing.Use a new one from Mazda not from an Auto parts store . I would also flush the system and clean the radiator inside and out . Next I would send the fuel injectors out for cleaning The may be leaking causing the motor to wash down be hard to start and smoke .Change the oil and filter and check the spark plug wires and coils and change the plugs for new ones .
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