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I have a 2000 F350 7.3 diesel when you turn the ignition key on the temperature gauge goes all the way to hot whether the trucks been running or not.
 

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Does it stay that way when the truck is running?
DENNY
 

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Probably the temp sensor. Common failure is to HOT. Unplug the wire and the gauge should read COLD. If it does then replace the sensor.
 
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