"The thermostat valve of engine cooling system of vehicle....
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remains closed while starting the engine from cold condition
opens as soon as the engine is started from cold condition
opens as soon as the engine is started and then closed after some time
remains closed when the engine is not running and always remains open when the engine is running
remains closed while starting the engine from cold condition
When the engine starts the already cooled coolant starts flowing through the engine block.
As the engine gets warmed up such that the temperature reaches 90 degrees Celcius (approx) the thermostat valves opens or in other words contracts paving a passage for the hot coolant to rush into the radiator.
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