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On the 2002 grand prix there is a sensor in the radiator about 6 inches from the top on the vehicles right side. It works based on electrical conductivity of the coolant. when it becomes dirty (doesn't conduct) or fails it will show low level. Remove the battery (for access) remove a spring clip (holds the sensor in) pull out the sensor and clean or replace. for the purpose of testing, with the sensor out of the radiator, but still plugged in and the key in run (engine off) ground the sensor to the battery. if the dash light goes out, the sensor is good. clean and reinstall.

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16y ago
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Q: 1993 grand prix that says low coolant when the coolant is full?
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