I have a 2009 Ford Escape 3.0L V6 that has a weird temperature pattern. The car 152,000 miles on it. For the past few weeks, the temperature gauge on my car will creep up past normal but never get to H or overheat, no steam or anything, this usually occurs at highway speeds or going uphill. The gauge will then return to normal after a few seconds. The water pump was replaced 2 years ago, the thermostat was replaced last year. Took it to a shop and they said the cooling system is fine. They did a coolant flush and found no leaks either. They also replaced the coolant temperature sensor. Still have the same problem. Is the head gasket blown or is it an electrical issue? I should also mention the radio display also cuts out sometimes. Open to any ideas or suggestions at this point. Thanks!