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Q: check coolant light keeps coming on on 2005 Cadillac DeVille

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coolant level checked-found to be okay light keeps coming on
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The coolant level sensor is in the coolant reservoir and is a fairly high-failure item. Temporarily unplug the sensor and see if the light goes out. If it does and comes on when connected and with the reservoir full, I would bet on the sensor. Unfortunately, I think you have to buy the reservoir to get the sensor.
Tank assembly at GM $ouch.
Tank assembly at eBay: about $125
GM will NOT sell you the sensor.
Some folks reported success with the $20 FLS16 Coolant Level Sensor (about $13 on eBay http://www.ebay.com/itm/Engine-Coolant-Level-Sensor-Standard-FLS-16-/331733944237 ). The FLS16 sensor is reported to be slightly longer requiring more care when reconnecting the harness plug.
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