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Q:

I have a temperture gauge that is reading almost HOT almost to the red. on 1997 Ford Expedition

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I have a temperture gauge that is reading almost HOT almost to the red. But when I lift the hood It's running OK and doesn't seam to be hot at all. I think its the sending unit or the gauge what would I check first and How
(3) Answers
Also, the thermostat may need replaced. It may have froze up in the full open position.
You could have defective coolant temp sending unit or the computer might be acting up.
have you thought about replacing the "thermostate" their are ones that you can purchase for a few dollars that will run cool when its hot