My sportages temp used to run around 1/4, now it runs just under the 1/2 mark. Speeds over 35 temp stays just under the 1/2 mark, but when i slow down to 10-25mph for extended time or sit in stop and go traffic, the temp will climb. I have a new radiator, new water pump, new thermostat, the clutch fan seems to be working, and there is flow in radiator. Plus i had the system checked so no leaky head gasket. Is there a sensor, or maybe the radiator cap????