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I see two possible reasons here the first would be that the coolant level sensor is malfunctioning. It is possibly located at the over flow tank. It could also just be dirty. I not really familiar with this model, but some models have the sensor at the overflow tank. The second possibility is that your radiator cap is malfunctioning and letting pressure out. The radiator cap should only vent when high pressure is created like when it overheats. You have to have pressure for the coolant system to circulate properly. This would mean you need to replace the radiator cap. That is two common causes. I hope I could be some help. Good luck.

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Q: What repair is needed when the low coolant light is on but the vehicle is not running hot and is full of coolant on a 1998 Grand Prix GT?
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