Thermostats sole purpose is to maintain proper engine temperature by regulating the flow of coolant to the radiator.
The thermostat is a small device, usually only 5 cm in diameter. When the engine is cold, the device is closed and does not allow coolant to flow out of the engine.
Once the engine heats up, the thermostat opens, allowing coolant to flow into the radiator and dissipate heat to the surroundings.
But how does the thermostat magically open when the engine heats up? Most are filled with wax, which melts and around 82℃.
A rod connected to the thermostat’s valve then press into the melted wax once it passes that temperature, opening the valve for coolant to flow. When the engine cools off, the wax re-solidifies and closes the valve.
Car thermostat replacement
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