Question about 2000 Chevrolet Impala

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Temperature gage not working

Information center says hot engine a/c off

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These cars and their Monte Carlo cousins were notorious for wiring problems with the two wires coming off the temp sensor. Backtrack the wires for about the first 14" off the sensor and you will probably find a swell or a limp spot. When the computer loses this signal the computer doesn't the engine temp.

Posted on Nov 26, 2013

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My 97 Nissan Altimas temperature gage inside car dash is stuck on the highest setting, past Hot. I replaced thermostat and temperature sensor. It's still not working. What else could be the problem?


Are you saying the gauge is stuck on hot even when the engine is cold ?
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Where is the temperature sensor for the temperature gage


Engine Temperature Sensor Operation:00116_engine_temp_sensor.jpgThis sensor monitors the temperature of the engine and sends that information to the engine control computer to regulate the amount of fuel needed - more if engine is cold and less if it's hot. The signal generated can also be sent to the temperature gauge as a visual indicator of overheating and imminent danger

I checked with autozone.com and their site says that the engine temperature sensor is not used on both engine sizes available for this vehicle.

The Coolant Temperature Sensor is used though. So maybe it has a dual purpose on your vehicle.

Coolant Temperature Sensor Operation:00113_coolant_temp_sensor.jpgThis sensor monitors the temperature of the engine and sends that information to the engine control computer to regulate the amount of fuel needed. More fuel is needed if the engine is cold; less if it's hot. If the temperature is extreme, the signal will be sent to the temperature gauge as a visual indicator of overheating and imminent danger.

Because ECT (engine coolant temperature) sensor procedures vary depending upon their location, first locate the part. You may need to partially drain the engine coolant to prevent coolant spillage.
  • Disconnect the negative battery cable.
  • Unplug the ECT.
  • Then, unscrew it.
  • Reverse the removal procedures to install the new part.
  • Connect the negative battery cable to the battery.









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The fan doesnt work but if i turn on the ac the fan starts working i want to know what the problem could be if some body could help me please. Thanks


The fan is used by both the engine cooling and the A/C systems. Evidently, your cooling system is not turning it on. Is the car overheating at idle? When I review the wiring diagrams for 89 Camaros, they indicate the fan is controlled by the engine control module using inputs from both the temperature sensor and the A/C settings. This leaves me puzzled. Do you have a temperature gage or light? If gage, how hot does it get? If light, does it come on?

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Dodge neon 1996 heat gage goes to hot andthen


is it really because the engine is hot, sounds like a flaky guage of the temperature sensor under the hood is going bad

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A thermostat stuck in the open position can cause both of these problems

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The guage and fan speeds work on independant sensors. If you can remove the plastic engine cover and locate the "sending unit" for the gauge disconnect it and restart the engine. The gauge should remain cold and not move. If this is the case replace the sending unit. This should be a single wire sender located in the waterjacket of the intake manifold look in the area where the upper rad hose enters the intake.

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