Why does the car's water temperature rise slowly?

[DelSteven]

Slow rising of the car's water temperature may be caused by a faulty thermostat. If the thermostat is damaged and causes the coolant to remain in the large circulation state, it will result in a slower increase in the car's water temperature. In such cases, it is recommended to check whether the thermostat is still functioning properly. Car engines rely on coolant for heat dissipation. When the engine is running, the coolant continuously circulates within the engine to remove excess heat. There are two circulation paths for the coolant in the engine: one is the large circulation, and the other is the small circulation. When the engine is just started, the temperature is relatively low, and the coolant will undergo small circulation. After the engine reaches its normal operating temperature, the coolant will switch to large circulation.