What is the reason why the water temperature of the car can't go up? Reasons for slow rise of automobile water temperature.

After the vehicle starts, there will be a warm-up process. During the engine warm-up, the water temperature rises slowly. The length of this time depends on the water temperature detected by the water temperature sensor. If the water temperature sensor is normal, it may be because of the circulation of the thermostat that the water temperature rises slowly. It is suggested that the owner mainly check the following two aspects: whether the thermostat is normal (which can be judged by the temperature difference between the inlet pipe and the outlet pipe of the radiator when getting on the bus) and whether the electric fan is abnormal. Most of the reasons why the car water temperature can't go up are these three common reasons: 1, the thermostat is turned on too early or normal; 2, the electric fan often turns; 3. The water temperature sensor is damaged. Damage to the water temperature sensor will cause a "false fault problem", that is, the actual water temperature is normal but the sensor misreports the water temperature. In addition, instrument misalignment may also lead to false low temperature. The reason for the slow rise of automobile water temperature may be related to outdoor temperature. Check whether the indication of temperature controller, water thermometer, sensor, circuit and instrument is accurate and whether the control of cooling fan is abnormal. At the same time, if the heating time is delayed, the hot car will be affected by excessive air flow or external circulation. The reason for the low water temperature of the engine may be that the thermostat is damaged, so that the thermostat can't close the valve, or the cooling fan keeps turning because of the fault. Thermostat is a control valve, which controls the circulation of coolant in the cooling system, including large circulation and small circulation. If the thermostat is on all the time, the coolant will circulate all the time, causing the water temperature to drop.