I have a 2006 GP GT. When the ambient temp is warm and the car is in traffic it will get hot. When the ambient temp is cold the car will not reach operating temperature while driving.
My first instinct was that the thermostat was bad. So I replaced the thermostat and flushed the coolant. This had no effect.
When hot the fans kick on when they are supposed to. The car has a new radiator cap too. No leaks and no issues with pressure testing.
Took to the dealer thinking it was under warranty. They couldn't find anything actually wrong with it because they couldn't diagnose it so my warranty did not pay them I needed to.
Any thoughts or suggestions from previous experiences would be great!