well there are different temperature thermostat(temp equals pressure or steam that the coolant creates as your engine gets hot) which can let your engine run hotter or cooler. if you have never changed your thermostat before your engine wont run cooler, it will run the same or get hotter because it has become stuck and no longer allowing coolant to run as smoothly through your head which will actually make it hotter and eventually fail. as why your head is getting colder, who knows, maybe because its winter, driving distances, and how do you know its colder than normal? you use a temp finder?
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