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just a suggestion and you probably already looked but newer cars sometimes have a sensor in or on the overflow tank Did you check to see if level is between min and max

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โˆ™ 2006-07-12 15:23:55
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Q: 99 Grand Prix low coolant light keeps coming on and going off you check the radiator and it is full just replaced the lower intake gasket and installed new intake plenum the light was on before this?
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