What is the reason for the slow rise of automobile water temperature?

The reason for the slow rise of automobile water temperature is usually the damage of thermostat or the failure of cooling fan. If the thermostat is damaged, the temperature will rise slowly because the thermostat cannot be closed. If the cooling fan fails, it will be in a state of non-stop rotation, so the water temperature rises slowly. If the thermostat of the car can't be closed because of the valve failure, the coolant will always be in a state of large circulation, and the water temperature of the engine will drop rapidly. The existence of thermostat is equivalent to a control valve, which can control the circulation of coolant in the cooling system. When the thermostat can't be opened normally, the engine can't start a large cycle, and the overheated coolant can't enter the water tank, which leads to the high temperature of the engine. At this time, the temperature and pressure of coolant are high, which is easy to damage small circulation systems, such as gaskets, heater water tanks and some water pipes. The solution to the slow rise of automobile water temperature: the thermostat is damaged and the cooling fan is out of order, which is easy to cause automobile failure. It is recommended to go to the 4s shop or the nearest repair shop for computer inspection and repair immediately.