Cadillac Repair: 1990 Cadillac Deville, coolant level, plastic jug

Question
CHECK COOLANT LEVEL light has come on two times in the last 3 month. What could be the possible cause?

Answer
Make sure that the plastic radiator overflow jug is at the FULL mark.. If the plastic jug is EMPTY this will cause the LOW COOLANT light to illuminate. If the overflow jug is at the full mark, Replace the COOLANT LEVEL SWITCH in the plastic overflow jug.