Why does the temperature guage work when the key is turned on but not when the vehicle is running?
Bad tempreture sending unit,or guage.
"I have changed both of them and it is still the same"
Check the wiring,from guage to sensor.
"I have checked the wiring from the sensor to the computer, changed the engine control monitor, body control monitor, ignition switch, and the cluster but it has all not helped"
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