The function of a thermostat is to block the flow of coolant to the radiator until the engine has reached a certain temperature as prescribed by the OEM. Therefore, when the engine is cold, no coolant flows through the engine.
Once the engine reaches its operating temperature, normally 92 degree celsius, the thermostat opens. By letting the engine warm up as quickly as possible, the thermostat reduces engine wear, deposits and emissions.
Echlin thermostats are made from the same material to meet OE design criteria. This means that the thermostats are more tolerant to excessive engine heat and poor coolant additives.
The specified degrees that the thermostat valves open and close are carefully monitored. This ensures that the engine temperature operates at the designated design criteria to ensure optimal combustion, thereby reducing emission gas and fuel consumption.