The thermostats is what regulates the flow of coolant through the engine. When the engine has been sitting for a while and is not warm, the thermostats will be closed.
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Thermostats, like any other part, don’t last forever. So, There are two scenarios for a failing thermostat:
If the thermostat becomes stuck in the open position. As a result, There is continuous flow of coolant into the radiator causing the engine to run cold. Also, Overcooled engines run inefficiently, which leads to increased fuel consumption and higher emission levels. In addition, the car interior will not heat up properly.
If the thermostat becomes stuck in the closed position. Consequently, The circulation of the coolant is blocked which causes the engine to overheat.
The consequences of an “open failure” may be less catastrophic than those of a “closed failure”.
A broken thermostat can also cause your car to overheat. The thermostat in your engine controls the flow of coolant. When the engine is cold, the coolant is allowed to circulate through the engine. As the coolant reaches operating temperature, the thermostat opens to allow some of the coolant to flow. This keeps the coolant in your engine at a specific temperature designed for best operation.