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Low Coolant Light

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I have a '99 Sierra with the 4.3 in it. My low coolant light comes on about once a month. The coolant level never drops, I am not blowing white smoke out of the exaust, there are no leaks in the cooling system and the oil is not a milky white it is clean. The only thing that I can think that is wrong is I might have a bad sensor. Has anyone else had this problem before????
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it doesnt take much to turn that light on...mine came on, and gradually got worse. turned out the water pump was bad....only 45K on it. never even leaked on the ground, burned off on the engine, i could only see it by looking closely or feeling the bottom of the pump
 
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