Coolant temperature does not reach and stable operation

Generally, automotive coolant temperature of about 90 degrees is optimal normal engine operating temperature. (Individual brand models sometimes differSamples). Buick 1.8 coolant Positioning Sensor does not reach failure and stabloperationindicating that the coolant temperatureistoolow.CausingcoolantCar Sensors Probably too low a relationship with the thermostat. Explain here, theroleofthethermostat: Changing the scope of the water cycle to regulate cooling systemCooling capacity, ensure the engine at a suitable temperature range. Because there is a largeengine cooling cycles and small cycles. If you say that the thermostatIs broken, and we have a large circulation cooling, it is very difficult to raise the water temperature to the engine Crankshaft Sensor stable operation