had the coolant light go off on me. coolant is full full, way past the F mark. happens when i rev above 5k. No over heat of the engine.Got pissed and took out the battery to gain access and removed the sensor under the coolant reservior tank. Washed and cleaned it up and so good so far. Hopefully it doesnt come back and irritate me. Those with such a problem can try taking out the sensor and cleaning it. Got this tip from 'the boy'.

 

hahaha. peace!