2007 Chevrolet Equinox
Service department at dealership cannot find anything wrong!
Question = Intermittent problem - temperature gauge will show car is overheating withing
minutes of turning car on... Arm on gauge is all the way up past the red overheat mark!!!  The
fans are working, the water in overflow tank is not boiling.  By time we drive to dealership, gauge
shows only slightly over half-way mark.  By time mechanic gets to it, it is acting normal again.  
Should we insist on a new temp sensor?
Answer:
The thing with the temp sensor, you see, is that if it is faulty, it would be faulty all the time.
This is a difficult problem to try and diagnose online. It might be best if you could leave the
vehicle overnight at the dealership, so when the mechanic looks at it, it should act up upon
starting. If there is an electrical problem, a trouble code could be set in the computer.

You could also have a problem with the temp gauge itself. Since your engine seems to
show no signs of overheating, I would assume that it isn't and you have some other issue
causing your gauge to spike.
;

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Chevy Equinox Gauge Shows Overheating