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I have a 2014 Fusion 1.5 with 108000 miles. When I get on a highway and I get up to 80mph & the RPMs go to 5-6k the temperature gauge goes all the way up and I get a high temperature warning. As soon as the speed and RPMs drop the gauge goes back to the center.

My mechanic checked the system and couldn't find anything wrong. Coolant level is good. He told me checked the internet and found that I might need a computer software upgrade.
 

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Sounds kind of odd, he might be right. I'd get an independent temperature sensor and see what it records to see if it's tracking with the dash.
 
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