2001 Taurus Low Coolant Light

Have a 2001 Taurus with 75000 miles on the clock. Last few days I noticed the "Low Collant Light" come on occasionally. The weather has been extremely hot but the engine temp is normal never wavers. Checked
the coolant level and it is within less than 1/2" of the fill lines. Any help would be appreciated.
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those switches are known to be unreliable on some models. Ford dealer should have plenty in stock and they should be easy to replace
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