Possibly low on coolant. Next most likely is a coolong fan not working. next a thermostat being stuck closed after thata water pump.
get a new temperature sensor.
220.
# 1 check point..Your sending unit has worn out. No big deal...Easy to replace..
Replace your thermostat had same problem it sets a code but no check engine light
my o6 chevy impala is lighting up on the dash that the engine is hot but the gauge is saying its cold what is wrong and how can i fix it?
We replaced the temperature gauge in my 1991 Chevy blazer what is the normal operating temp?
You could have a bad thermostat....mine wasn't moving at all and the fan would come on at start up.Make sure to clear your computer after you change it.
Replace sending unit
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.
get a circuit tester and start looking with the key on
It means that the hydraulics which operate your fuel and temperature gauges may be leaking or damaged. One or more of the gauges is out of the normal operating range when engine is running. It could be the oil pressure gauge is reading to low, the temperature gauge is reading to high or the voltmeter is reading to low so, check the gauges.
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