I have a 2007 ford mustang gt. My car does not over heat, but when i turn on the car and it reaches 198F, the cooling fan starts and stays on all the time and it stops only if i turn the key off. It sounds very loud. I changed the coolant myself and the next day it was doing that. I notice that the upper radiator hose is very hot, while the lower radiator hose is cold and not hard. Could it be the thermostat?
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