> Gauge show car is running hot but it is not hot, and then it gauge goes back to cool?

Gauge show car is running hot but it is not hot, and then it gauge goes back to cool?

Posted at: 2015-01-07 
When gauge reading vary it is most likely to be a faulty gauge or connection

Radiator man opened cap and said water in radiator is not hot

How do you know it's not hot? How hot? What year make model?

or air lock in coolant sysytem