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When you start the car in the morning with a cold engine, the main purpose of the thermostat is to help the engine quickly warm up to the optimal temperature.
The optimal temperature for different machines varies approximately from 90 degrees to 110 degrees. Its main purpose is to maintain the optimal operating temperature of the engine. This is a thermal valve, so to speak - which opens and closes at a certain temperature.
Why is it important to quickly warm up the engine to the optimal temperature?