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Q: Low Coolant llight......temporary loss of power on 2001 Buick Century

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just purchased a 2001 Buick Century...on the way home the low coolant light came on and the temperature guage went to RED...also the TRAC light came on and the car lost power...could only go about 20 mph....shut the car off and regained power....replaced the thermostat...still have the low coolant light
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If the radiator is full and the low coolant light is on the fault is most likely with the low coolant sensor or the wiring to the sensor. The low coolant sensor is located in the radiator side tank near the top. It is not uncommon for the low coolant sensors to fail.