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It could be a faulty gauge, a faulty sensor, or a wiring problem. What engine do you have in what year car?
Possible causes of gauge not working. Faulty gauge Blown fuse. Open circuit in wiring to the gauge. Temprature transmitter in engine faulty. ( most probably the actual fault ) Lack of coolant in the engine.
There are several reasons this could be:There is no coolant in the engine to trigger the temperature gauge, this will cause complete engine failure very quicklyThe gauge, wiring or sender are badThe engine temperature control thermostat has jammed open or it has been removed.
One scenario could be that the sending unit for the gauge on the engine is bad. Try to locate it and replace it if it is corroded and check the wiring to it also.
Why would the temperature gauge indicate an overheated condition when the engine is not hot. It could be the gauge in the instrument panel. Unlikey however. More likely it is a bad coolant temperature sensor or the wiring from the sensor back to the instrument panel. Inspect the wiring and replace the coolant sensor. The sensor is not too expensive.
engine coolant
Bad gauge, bad sending unit, bad wiring.
You need to specify the amperage requirement and operating temperature to answer this.
Your engine coolant temperature gauge has a sensor ( there is also a engine coolant temperature sensor that is used for the computer / PCM )
A signal from the temperature sensor on the engine.
You have two different temperature sensors in your engine. One is connected to the gage on your dash. The other is connected to your car's computer. The one connected to your car's computer either malfunctioned or a wire leading to it broke. When that happened, it told your car's computer that the engine had overheated.
The average aircraft will have temperature gauges for the following: Outside air temperature, Engine air inlet temperature, Engine exhaust temperature, cabin temperature, and that's just on a small aircraft. So which temperature gauge do you mean?