Factory water temp guages only have 3 positions.. Normal, hot and off the guage. Generally normal is anywhere under 102 degree C, hot is 102-115, off the guage is boiling. If you have ever had an aftermarket water temp guage you will see that it constantly moves as the thermostat regulates the water temp. So if you are seeing the factory guage move from its normal position the car is not happy. Kev