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English: I had been noticing for some time that the engine was having some difficulty getting up to temperature during the winter months. The thermostat, when blocked in the open position, causes the coolant to circulate continuously throughout the cooling system. In extreme cases, a clear sign that indicates the need to replace it is limited operation of the interior heating, which uses the heat from the engine. Consequently, if the liquid circulates continuously, there will be unnecessary heat disposal and a drop in operating temperatures. The intervention was carried out with an outside temperature of 15°, therefore not rigid. To accentuate the difference in the behavior of the new thermostat compared to the old one, I used the interior heating (which works like a radiator) and made these measurements: - with the old thermostat, the temperature dropped by about one notch in 5 minutes; - with the new thermostat, the temperature dropped by half during the first 5 minutes and another 3 minutes were needed to reach the same level as the old one, demonstrating that it always remained open and gave the possibility of disposing of more heat without taking operating temperatures into account.