The gauge stays in the middle when the car is on.Even when only the ignition is on, it goes to the middle. Then back down when the car is off.Goes straight to the middle on a cold start, and stays there when warm and never moves (until I turn off the engine).I unplugged the coolant temp sensor (CTS) and turned on the ignition (not the engine) and the gauge went to the middle again. This also kicked on the cooling fans.Then I unplugged the temp sender unit (right next to the CTS) and the gauge still went to the middle again when I turned on the ignition.What is wrong here? Any ideas?