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Defective low coolant sensor. Be aware that the sensor can be good but just clogged up. Have you ever put stop leak junk in your cooling system? If you did you have now learned a $50 lesson on what NOT to do to your car!! Sensor part #10096163 about $50 from GM. But first remove the sensor and clean it. See if that might save you from replacing the sensor. . . .

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Q: What might cause the low coolant light to flash sometimes or stay on when coolant levels good and a new water pump installed on a 99 Monte Carlo 3100 The thermostat opens and the fans light off?
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