Why isn't my temperature gauge going up?

I have a 2004 ford ranger 2.3. Its 48 degrees right now in texas and its raining. I cranked my truck and it died 10 seconds later. I cranked it 2 more times and it would die as soon as it turned on. I tried a fourth time and it turned. The truck has been on for 45 minutes and the temperature gauge hasn't moved at all. The heater is working fine though and the truck isn't making any weird noises or smells. What could be the problem?

Maybe its low on water. The fluid has to actually contact the sensor.

The temp gauge isn't working. Its unplugged.

Check the coolant level. If it's too low the temperature sensor won't work.

Hi so still expect wonders from a 13 years old car designed to last just 8 years well hardly surprising honsetly.

The temp sensor is bad or the wire from it to the ECU is bad. Of course, it could be the gauge or ECU.

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