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Low coolant light comes on when coolant sensor corrodes over time...
...gives a false indication of a low coolant problem even though there is none.
Check the sensor residing at the bottom of the expansion tank...you will feel a bit of moisture, but it's trace, so overall, it won't change your coolant level appreciably.
I have been able to clean the contacts and get the light to stay off for a few days/weeks/months, but it comes back on eventually. The only sure cure is replacement.
A new one is about $40 and takes about 15 minutes to do the fix...
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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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