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.
The 1999 Cadillac normal coolant temperature gauge reading should be 180 degrees. A 195 degrees thermostat could be used, causing the temperature gauge to read 195.
Either your oil pressure gauge is reading low , your engine temperature gauge is reading high , or your fuel gauge is reading low so your almost out of gas
Speedometer, fuel gauge, and temperature gauge.
Is vehicle actually overheating? Could be a bad temperature sending unit or gauge Check temperature with a thermometer If thermostat does not open vehicle will overheat
Usually the gauge in on the dashboard with all the other gauges. That way you can read it while driving.
If the gauge is reading hot and the car is running normal temperatures, the water temperature sensor needs replaced.
Most likely a bad sensor
Center of gauge. 180-220 FCenter of gauge. 180-220 F
Below the middle mark. if you have not removed the battery and the needles poped past the stops. this willmove the temp gauge and place it at a higher reading. replace dash to correct this.
It depends on the setpoint of the thermostat.