Most likely the coolant sensor is bad......The sensor has probably cracked and leaked into the harness, causing the harnes to corrode. Very common problem Check the sensor first!!!!!
Not neccessarily it sounds more like it could be a thermostat problem,water pump not pumping at capacity I mean there could be a clog but highly unlikely would'nt life be grand if all our automobile problems were simple and cheap ones head gasket problem is another culprit but start small and work your way to the big problems the cooling system is a pretty simple system aside from the Engine Coolant Temperature Sensor which I have seen cause problems that you would think it could have nothing to do with give that baby a once over as well
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^^^^NOT a thermostat issue. Thermostats are designed to be open when/if they fail. The car would always be cool if the thermostat was bad. Also, because the ECTS has NOT been replaced the gauge can NOT be used as an accurate temperature reading. The PCM uses the sensor to control the fan power. If this sensor is bad then the PCM will not turn the fan on, thus allowing the car to over heat. Replace the ECTS ASAP and move on from there if the issue is not solved!
a thermostat stuck open in fail safe mode WILL cause overheating because the coolant free flows and doesnt have enough capture time in the radiator to let the fans cool,hence the degree ratings on the thermostat for various climates.give good info or dont give it.a removed thermostat or a free flow stuck open will not allow enough cool time for coolant.stopping flow give the radiator and fans the gradual cooling time needed to accomplish this.
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