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

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

by in Fresno, CA on July 16, 2012
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3 answers
ANSWER by , July 16, 2012
You could have defective coolant temp sending unit or the computer might be acting up.
ANSWER by , July 17, 2012
Also, the thermostat may need replaced. It may have froze up in the full open position.
ANSWER by , January 06, 2014
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