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This versions was created on December 10th, 2010 at 5:38 PM by junkyardhemi
Coolant is at the borderline to set the sensor
Coolant level is just below the sensor borderline. As the engine heats up, the coolant expands, turning off a low coolant warning light. When it cools the coolant contracts allowing it to drop below the required threshold and illuminates the light again.