octaneman

The low coolant light can be either a bad sensor or the wires are grounding somewhere. When the engine starts to overheat the temperature sensor is giving signals to the computer to correct the air/fuel ratio, but it also takes readings from other sensors and attempts to compensate the difference throwing the engine off balance. The computer only knows what the sensors tell it, and when the readings conflict with its internal programming the computer will go into limp home mode telling the user there is a problem with the sensors and it warns the driver with the check engine light. If the engine has seriously overheated, then it's not uncommon to find the coolant temperature sensor for the ECM to be burned out. The coolant sensor can be fooling the ECM that the engine is dead cold and send false readings causing the engine to rev high even though its hot.