Usually the sensor is located in the reservoir. If contaminated it can stick when the level gets low. Not knowing the year most can be removed and cleaned up. If that doesn"t work, then the sensor is the first thing to replace. To check it use a paper clip and jump across the electrical contacts of the wiring connector. If light goes out the circuit is good.
Many times vehicles have a coolant sensor mounted on the radiator that goes bad allowing the low coolant light to stay lit changing this sensor usually takes care of the light also make sure the wires running to the sensor are not shorted or broke.
SOURCE: 'low coolant"
Inside the surge tank is a float that turns on the "low coolant" light. As the float gets gummed up it gets stuck in the low position. I've had good luck in cleaning the surge tank out really well and ungummed the float so it slides up and down like it should.
SOURCE: replace coolant level sensor
THESE SENSORS ARE A KNOWN PROBLEM REPLACE IT, IT IS HELD IN BY A WIRE RETAINER CLIP, IT IS LOCATED IN THE PLASTIC SIDE TANK OF THE RADIATOR NEAR THE TOP OF THE TANK, ENGINE SIDE. THE PART IS ABOUT $60.00
SOURCE: low coolant light stays on, coolant level is full
Check coolant level sensor, sit in the coolant resv. tank has two wire that go to it, tap on tank see if light goes off, if it don't replace sensor easy to do, part run's about $12.00 - $20.00, part # FLS609 at NAPA. Hope this was helpful.
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